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* Merge branch 'locking-core-for-linus' of ↵Linus Torvalds2014-06-03185-650/+549
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next Pull core locking updates from Ingo Molnar: "The main changes in this cycle were: - reduced/streamlined smp_mb__*() interface that allows more usecases and makes the existing ones less buggy, especially in rarer architectures - add rwsem implementation comments - bump up lockdep limits" * 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (33 commits) rwsem: Add comments to explain the meaning of the rwsem's count field lockdep: Increase static allocations arch: Mass conversion of smp_mb__*() arch,doc: Convert smp_mb__*() arch,xtensa: Convert smp_mb__*() arch,x86: Convert smp_mb__*() arch,tile: Convert smp_mb__*() arch,sparc: Convert smp_mb__*() arch,sh: Convert smp_mb__*() arch,score: Convert smp_mb__*() arch,s390: Convert smp_mb__*() arch,powerpc: Convert smp_mb__*() arch,parisc: Convert smp_mb__*() arch,openrisc: Convert smp_mb__*() arch,mn10300: Convert smp_mb__*() arch,mips: Convert smp_mb__*() arch,metag: Convert smp_mb__*() arch,m68k: Convert smp_mb__*() arch,m32r: Convert smp_mb__*() arch,ia64: Convert smp_mb__*() ...
| * rwsem: Add comments to explain the meaning of the rwsem's count fieldTim Chen2014-05-041-0/+49
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It took me quite a while to understand how rwsem's count field mainifested itself in different scenarios. Add comments to provide a quick reference to the the rwsem's count field for each scenario where readers and writers are contending for the lock. Hopefully it will be useful for future maintenance of the code and for people to get up to speed on how the logic in the code works. Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com> Cc: Davidlohr Bueso <davidlohr@hp.com> Cc: Alex Shi <alex.shi@linaro.org> Cc: Michel Lespinasse <walken@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: Peter Hurley <peter@hurleysoftware.com> Cc: Paul E.McKenney <paulmck@linux.vnet.ibm.com> Cc: Jason Low <jason.low2@hp.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1399060437.2970.146.camel@schen9-DESK Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * lockdep: Increase static allocationsSasha Levin2014-04-181-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | Fuzzing a recent kernel with a large configuration hits the static allocation limits and disables lockdep. This patch doubles the limits. Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1389208906-24338-1-git-send-email-sasha.levin@oracle.com Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch: Mass conversion of smp_mb__*()Peter Zijlstra2014-04-18106-288/+284
| | | | | | | | | | | | | | | | | | | | | | Mostly scripted conversion of the smp_mb__* barriers. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-55dhyhocezdw1dg7u19hmh1u@git.kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-arch@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,doc: Convert smp_mb__*()Peter Zijlstra2014-04-182-50/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Update the documentation to reflect the change of barrier primitives. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: David Howells <dhowells@redhat.com> Link: http://lkml.kernel.org/n/tip-xslfehiga1twbk5uk94rij1e@git.kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,xtensa: Convert smp_mb__*()Peter Zijlstra2014-04-183-9/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Xtensa SMP has compare-and-swap which is fully serializing, therefore its exising smp_mb__{before,after}_clear_bit() appear unduly heavy. Implement the new barriers as barrier(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-e9rqjxr1m1ejsob9p433kmji@git.kernel.org Cc: Chris Zankel <chris@zankel.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: linux-kernel@vger.kernel.org Cc: linux-xtensa@linux-xtensa.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,x86: Convert smp_mb__*()Peter Zijlstra2014-04-185-12/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | x86 is strongly ordered and all its atomic ops imply a full barrier. Implement the two new primitives as the old ones were. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-knswsr5mldkr0w1lrdxvc81w@git.kernel.org Cc: Dave Jones <davej@redhat.com> Cc: Jesse Brandeburg <jesse.brandeburg@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michel Lespinasse <walken@google.com> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,tile: Convert smp_mb__*()Peter Zijlstra2014-04-186-26/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement the new smp_mb__* ops as per the old ones. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Link: http://lkml.kernel.org/n/tip-euuabnf5a3u23fy4fq8m3jcg@git.kernel.org Cc: Akinobu Mita <akinobu.mita@gmail.com> Cc: Chen Gang <gang.chen@asianux.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,sparc: Convert smp_mb__*()Peter Zijlstra2014-04-185-18/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | sparc32: fully relies on asm-generic/barrier.h and thus can use its implementation. sparc64: is strongly ordered and its atomic ops imply a full barrier, implement the new primitives using barrier(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: David S. Miller <davem@davemloft.net> Link: http://lkml.kernel.org/n/tip-2cla9ubpd8chrntnm7e4zdt4@git.kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-kernel@vger.kernel.org Cc: sparclinux@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,sh: Convert smp_mb__*()Peter Zijlstra2014-04-182-11/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | SH can use the asm-generic/barrier.h implementation since that uses smp_mb(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-2z962by2ppzcd984ybw2mwdw@git.kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-kernel@vger.kernel.org Cc: linux-sh@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,score: Convert smp_mb__*()Peter Zijlstra2014-04-181-6/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | score fully relies on asm-generic/barrier.h, so it can use its default implementation. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Lennox Wu <lennox.wu@gmail.com> Link: http://lkml.kernel.org/n/tip-4mv9svf28lnotjpfuza8urh8@git.kernel.org Cc: Chen Liqin <liqin.linux@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,s390: Convert smp_mb__*()Peter Zijlstra2014-04-182-7/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As per the existing implementation; implement the new one using smp_mb(). AFAICT the s390 compare-and-swap does imply a barrier, however there are some immediate ops that seem to be singly-copy atomic and do not imply a barrier. One such is the "ni" op (which would be and-immediate) which is used for the constant clear_bit implementation. Therefore s390 needs full barriers for the {before,after} atomic ops. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-kme5dz5hcobpnufnnkh1ech2@git.kernel.org Cc: Chen Gang <gang.chen@asianux.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: linux390@de.ibm.com Cc: linux-kernel@vger.kernel.org Cc: linux-s390@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,powerpc: Convert smp_mb__*()Peter Zijlstra2014-04-184-11/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Powerpc allows reordering over its ll/sc implementation. Implement the two new barriers as appropriate. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-gg2ffgq32sjgy9b8lj6m3hsc@git.kernel.org Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-kernel@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,parisc: Convert smp_mb__*()Peter Zijlstra2014-04-182-8/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | parisc fully relies on asm-generic/barrier.h, therefore its smp_mb() is barrier and the default implementation suffices. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-mxs4aubiyesi79v8xx53093q@git.kernel.org Cc: Helge Deller <deller@gmx.de> Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-kernel@vger.kernel.org Cc: linux-parisc@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,openrisc: Convert smp_mb__*()Peter Zijlstra2014-04-181-8/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Openrisc fully relies on asm-generic/barrier.h and therefore its smp_mb() is barrier(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-sxgxgqag9tond4kji07d22oh@git.kernel.org Cc: Jonas Bonn <jonas@southpole.se> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-kernel@vger.kernel.org Cc: linux@lists.openrisc.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,mn10300: Convert smp_mb__*()Peter Zijlstra2014-04-183-11/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | mn10300 fully relies on asm-generic/barrier.h and therefore its smp_mb() is barrier(). We can use the default implementation. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-wotyeoj99h1dpojjeest2jbk@git.kernel.org Cc: David Howells <dhowells@redhat.com> Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-am33-list@redhat.com Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,mips: Convert smp_mb__*()Peter Zijlstra2014-04-184-20/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | MIPS is interesting and has hardware variants that reorder over ll/sc as well as those that do not. Implement the 2 new barrier functions as per the old barriers. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-9ph49jbae3hol9v721sbc2g6@git.kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maciej W. Rozycki" <macro@codesourcery.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,metag: Convert smp_mb__*()Peter Zijlstra2014-04-183-11/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement the new barriers; as per the old versions the metag atomic imply a full barrier. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-dqnyo215kq38wi4xcxnbpjw3@git.kernel.org Cc: James Hogan <james.hogan@imgtec.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-kernel@vger.kernel.org Cc: linux-metag@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,m68k: Convert smp_mb__*()Peter Zijlstra2014-04-182-13/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | m68k uses asm-generic/barrier.h and its smp_mb() is barrier(), therefore we can use the generic versions that use smp_mb(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-s5dvosrb7qhvpmtaffwfn0zg@git.kernel.org Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-kernel@vger.kernel.org Cc: linux-m68k@lists.linux-m68k.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,m32r: Convert smp_mb__*()Peter Zijlstra2014-04-182-10/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | M32r uses asm-generic/barrier.h and its smp_mb() is barrier(); therefore we can use the generic versions which default to smp_mb(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-wh6xljltyvmpy9t0bc80k1fy@git.kernel.org Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-kernel@vger.kernel.org Cc: linux-m32r-ja@ml.linux-m32r.org Cc: linux-m32r@ml.linux-m32r.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,ia64: Convert smp_mb__*()Peter Zijlstra2014-04-183-10/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ia64 atomic ops are full barriers; implement the new smp_mb__{before,after}_atomic(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-hyp7yj68cmqz1nqbfpr541ca@git.kernel.org Cc: Akinobu Mita <akinobu.mita@gmail.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-ia64@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,hexagon: Convert smp_mb__*()Peter Zijlstra2014-04-182-8/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Hexagon uses asm-gemeric/barrier.h and its smp_mb() is barrier(). Therefore we can use the default implementation that uses smp_mb(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-87irqrrbgizeojjfdqhypud3@git.kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: linux-hexagon@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,frv: Convert smp_mb__*()Peter Zijlstra2014-04-182-12/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Because: arch/frv/include/asm/smp.h:#error SMP not supported smp_mb() is barrier() and we can use the default implementation that uses smp_mb(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-n296g51yzdu5ru1vp7mccxmf@git.kernel.org Cc: David Howells <dhowells@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,cris: Convert smp_mb__*()Peter Zijlstra2014-04-182-13/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Cris fully relies on asm-generic/barrier.h, therefore its smp_mb() is barrier(), thus we can use the default implementation that uses smp_mb(). (Include asm/system.h and asm/barrier.h to avoid header dependency hell.) Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-wvewbe8os3s1e4pt1cdotuee@git.kernel.org Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mikael Starvik <starvik@axis.com> Cc: linux-cris-kernel@axis.com Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,c6x: Convert smp_mb__*()Peter Zijlstra2014-04-181-7/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | c6x doesn't have a barrier.h and completely relies on asm-generic/barrier.h. Therefore its smp_mb() is barrier() and we can use the default versions that are smp_mb(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Mark Salter <msalter@redhat.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-kl53k3pyj0rbd80jq8ralpf3@git.kernel.org Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mark Salter <msalter@redhat.com> Cc: linux-c6x-dev@linux-c6x.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,blackfin: Convert smp_mb__*()Peter Zijlstra2014-04-182-12/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Blackfin's atomic primitives do not imply a full barrier as whitnessed from its SMP smp_mb__{before,after}_clear_bit() implementations. However since !SMP smp_mb() reduces to barrier() remove everything and rely on the asm-generic/barrier.h implentation. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-1widdkdsb3c1titq8jez6g3g@git.kernel.org Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Steven Miao <realmz6@gmail.com> Cc: adi-buildroot-devel@lists.sourceforge.net Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,avr32: Convert smp_mb__*()Peter Zijlstra2014-04-182-12/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | AVR32's mb() implementation is a compiler barrier(), therefore it all doesn't matter, fully rely on whatever asm-generic/barrier.h generates. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-8gow97a7mapmnec0pvf729pj@git.kernel.org Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,arm64: Convert smp_mb__*()Peter Zijlstra2014-04-183-14/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | AARGH64 uses ll/sc primitives that do not imply any barriers for the normal atomics, therefore smp_mb__{before,after} should be a full barrier. Since AARGH64 doesn't use asm-generic/barrier.h, add the required definitions to its asm/barrier.h. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-8p5iclqgy78al33kck3ht7nr@git.kernel.org Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chen Gang <gang.chen@asianux.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,arm: Convert smp_mb__*()Peter Zijlstra2014-04-183-8/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ARM uses ll/sc primitives that do not imply barriers for all regular atomic ops, therefore smp_mb__{before,after} need be a full barrier. Since ARM doesn't use asm-generic/barrier.h include the required definitions in its asm/barrier.h Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-yijo7sglsl7uusbp13upcuvo@git.kernel.org Cc: Albin Tonnerre <albin.tonnerre@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chen Gang <gang.chen@asianux.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nicolas Pitre <nico@linaro.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: Victor Kamensky <victor.kamensky@linaro.org> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,arc: Convert smp_mb__*()Peter Zijlstra2014-04-182-9/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The arc mb() implementation is a compiler barrier(), therefore it all doesn't matter one way or the other. Simply remove the existing definitions and use whatever is generated by the defaults. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-ua48a59wri3ybz1rz8i7uvbr@git.kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch,alpha: Convert smp_mb__*() to the asm-generic primitivesPeter Zijlstra2014-04-182-8/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The Alpha ll/sc primitives do not imply any sort of barrier; therefore the smp_mb__{before,after} should be a full barrier. This is the default from asm-generic/barrier.h and therefore just remove the current definitions. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-iacwfd15lq3ta2v7jut747r7@git.kernel.org Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Richard Henderson <rth@twiddle.net> Cc: linux-alpha@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arch: Prepare for smp_mb__{before,after}_atomic()Peter Zijlstra2014-04-186-14/+82
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since the smp_mb__{before,after}*() ops are fundamentally dependent on how an arch can implement atomics it doesn't make sense to have 3 variants of them. They must all be the same. Furthermore, the 3 variants suggest they're only valid for those 3 atomic ops, while we have many more where they could be applied. So move away from smp_mb__{before,after}_{atomic,clear}_{dec,inc,bit}() and reduce the interface to just the two: smp_mb__{before,after}_atomic(). This patch prepares the way by introducing default implementations in asm-generic/barrier.h that default to a full barrier and providing __deprecated inlines for the previous 6 barriers if they're not provided by the arch. This should allow for a mostly painless transition (lots of deprecated warns in the interim). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-wr59327qdyi9mbzn6x937s4e@git.kernel.org Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Chen, Gong" <gong.chen@linux.intel.com> Cc: John Sullivan <jsrhbz@kanargh.force9.co.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mauro Carvalho Chehab <m.chehab@samsung.com> Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * arc,hexagon: Delete asm/barrier.hPeter Zijlstra2014-04-182-74/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Both already use asm-generic/barrier.h as per their include/asm/Kbuild. Remove the stale files. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-c7vlkshl3tblim0o8z2p70kt@git.kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: linux-hexagon@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * ia64: Fix up smp_mb__{before,after}_clear_bit()Peter Zijlstra2014-04-182-5/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | IA64 doesn't actually have acquire/release barriers, its a lie! Add a comment explaining this and fix up the bitop barriers. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-akevfh136um9dqvb1ohm55ca@git.kernel.org Cc: Akinobu Mita <akinobu.mita@gmail.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Tony Luck <tony.luck@intel.com> Cc: linux-ia64@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* | Merge branch 'core-rcu-for-linus' of ↵Linus Torvalds2014-06-0331-412/+1210
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next Pull RCU changes from Ingo Molnar: "The main RCU changes in this cycle were: - RCU torture-test changes. - variable-name renaming cleanup. - update RCU documentation. - miscellaneous fixes. - patch to suppress RCU stall warnings while sysrq requests are being processed" * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (68 commits) rcu: Provide API to suppress stall warnings while sysrc runs rcu: Variable name changed in tree_plugin.h and used in tree.c torture: Remove unused definition torture: Remove __init from torture_init_begin/end torture: Check for multiple concurrent torture tests locktorture: Remove reference to nonexistent Kconfig parameter rcutorture: Run rcu_torture_writer at normal priority rcutorture: Note diffs from git commits rcutorture: Add missing destroy_timer_on_stack() rcutorture: Explicitly test synchronous grace-period primitives rcutorture: Add tests for get_state_synchronize_rcu() rcutorture: Test RCU-sched primitives in TREE_PREEMPT_RCU kernels torture: Use elapsed time to detect hangs rcutorture: Check for rcu_torture_fqs creation errors torture: Better summary diagnostics for build failures torture: Notice if an all-zero cpumask is passed inside a critical section rcutorture: Make rcu_torture_reader() use cond_resched() sched,rcu: Make cond_resched() report RCU quiescent states percpu: Fix raw_cpu_inc_return() rcutorture: Export RCU grace-period kthread wait state to rcutorture ...
| * \ Merge branch 'rcu/next' of ↵Ingo Molnar2014-05-2231-412/+1210
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu Pull RCU updates from Paul E. McKenney: " 1. Update RCU documentation. These were posted to LKML at https://lkml.org/lkml/2014/4/28/634. 2. Miscellaneous fixes. These were posted to LKML at https://lkml.org/lkml/2014/4/28/645. 3. Torture-test changes. These were posted to LKML at https://lkml.org/lkml/2014/4/28/667. 4. Variable-name renaming cleanup, sent separately due to conflicts. This was posted to LKML at https://lkml.org/lkml/2014/5/13/854. 5. Patch to suppress RCU stall warnings while sysrq requests are being processed. This patch is the RCU portions of the patch that Rik posted to LKML at https://lkml.org/lkml/2014/4/29/457. The reason for pushing this patch ahead instead of waiting until 3.17 is that the NMI-based stack traces are messing up sysrq output, and in some cases also messing up the system as well." Signed-off-by: Ingo Molnar <mingo@kernel.org>
| | * | rcu: Provide API to suppress stall warnings while sysrc runsRik van Riel2014-05-192-0/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some sysrq handlers can run for a long time, because they dump a lot of data onto a serial console. Having RCU stall warnings pop up in the middle of them only makes the problem worse. This commit provides rcu_sysrq_start() and rcu_sysrq_end() APIs to temporarily suppress RCU CPU stall warnings while a sysrq request is handled. Signed-off-by: Rik van Riel <riel@redhat.com> [ paulmck: Fix TINY_RCU build error. ] Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
| | * | rcu: Variable name changed in tree_plugin.h and used in tree.cUma Sharma2014-05-142-16/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The variable and struct both having the name "rcu_state" confuses sparse in some situations, so this commit changes the variable to "rcu_state_p" in order to avoid this confusion. This also makes things easier for human readers. Signed-off-by: Uma Sharma <uma.sharma523@gmail.com> [ paulmck: Changed the declaration and several additional uses. ] Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
| | | |
| | | \
| | *-. \ Merge branches 'doc.2014.04.29a', 'fixes.2014.04.29a' and ↵Paul E. McKenney2014-05-1426-383/+747
| | |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 'torture.2014.05.14a' into HEAD doc.2014.04.29a: Documentation updates. fixes.2014.04.29a: Miscellaneous fixes. torture.2014.05.14a: RCU/Lock torture tests.
| | | | * | torture: Remove unused definitionPranith Kumar2014-05-141-6/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The torture_parm() macro is the same as torture_param(), and torture_parm() is not used. This commit therefore removes torture_parm(). Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
| | | | * | torture: Remove __init from torture_init_begin/endPranith Kumar2014-05-141-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Loading rcutorture as a module (as opposed to building it directly into the kernel) results in the following splat: [Wed Apr 16 15:29:33 2014] BUG: unable to handle kernel paging request at ffffffffa0003000 [Wed Apr 16 15:29:33 2014] IP: [<ffffffffa0003000>] 0xffffffffa0003000 [Wed Apr 16 15:29:33 2014] PGD 1c0f067 PUD 1c10063 PMD 378a6067 PTE 0 [Wed Apr 16 15:29:33 2014] Oops: 0010 [#1] SMP [Wed Apr 16 15:29:33 2014] Modules linked in: rcutorture(+) torture [Wed Apr 16 15:29:33 2014] CPU: 0 PID: 4257 Comm: modprobe Not tainted 3.15.0-rc1 #10 [Wed Apr 16 15:29:33 2014] Hardware name: innotek GmbH VirtualBox, BIOS VirtualBox 12/01/2006 [Wed Apr 16 15:29:33 2014] task: ffff8800db1e88d0 ti: ffff8800db25c000 task.ti: ffff8800db25c000 [Wed Apr 16 15:29:33 2014] RIP: 0010:[<ffffffffa0003000>] [<ffffffffa0003000>] 0xffffffffa0003000 [Wed Apr 16 15:29:33 2014] RSP: 0018:ffff8800db25dca0 EFLAGS: 00010282 [Wed Apr 16 15:29:33 2014] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [Wed Apr 16 15:29:33 2014] RDX: ffffffffa00090a8 RSI: 0000000000000001 RDI: ffffffffa0008337 [Wed Apr 16 15:29:33 2014] RBP: ffff8800db25dd50 R08: 0000000000000000 R09: 0000000000000000 [Wed Apr 16 15:29:33 2014] R10: ffffea000357b680 R11: ffffffff8113257a R12: ffffffffa000d000 [Wed Apr 16 15:29:33 2014] R13: ffffffffa00094c0 R14: ffffffffa0009510 R15: 0000000000000001 [Wed Apr 16 15:29:33 2014] FS: 00007fee30ce5700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [Wed Apr 16 15:29:33 2014] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [Wed Apr 16 15:29:33 2014] CR2: ffffffffa0003000 CR3: 00000000d5eb1000 CR4: 00000000000006f0 [Wed Apr 16 15:29:33 2014] Stack: [Wed Apr 16 15:29:33 2014] ffffffffa000d02c 0000000000000000 ffff88021700d400 0000000000000000 [Wed Apr 16 15:29:33 2014] ffff8800db25dd40 ffffffff81647951 ffff8802162bd000 ffff88021541846c [Wed Apr 16 15:29:33 2014] 0000000000000000 ffffffff817dbe2d ffffffff817dbe2d 0000000000000001 [Wed Apr 16 15:29:33 2014] Call Trace: [Wed Apr 16 15:29:33 2014] [<ffffffffa000d02c>] ? rcu_torture_init+0x2c/0x8b4 [rcutorture] [Wed Apr 16 15:29:33 2014] [<ffffffff81647951>] ? netlink_broadcast_filtered+0x121/0x3a0 [Wed Apr 16 15:29:33 2014] [<ffffffff817dbe2d>] ? mutex_lock+0xd/0x2a [Wed Apr 16 15:29:33 2014] [<ffffffff817dbe2d>] ? mutex_lock+0xd/0x2a [Wed Apr 16 15:29:33 2014] [<ffffffff810e7022>] ? trace_module_notify+0x62/0x1d0 [Wed Apr 16 15:29:33 2014] [<ffffffffa000d000>] ? 0xffffffffa000cfff [Wed Apr 16 15:29:33 2014] [<ffffffff8100034a>] do_one_initcall+0xfa/0x140 [Wed Apr 16 15:29:33 2014] [<ffffffff8106b4ce>] ? __blocking_notifier_call_chain+0x5e/0x80 [Wed Apr 16 15:29:33 2014] [<ffffffff810b3481>] load_module+0x1931/0x21b0 [Wed Apr 16 15:29:33 2014] [<ffffffff810b0330>] ? show_initstate+0x50/0x50 [Wed Apr 16 15:29:33 2014] [<ffffffff810b3d9e>] SyS_init_module+0x9e/0xc0 [Wed Apr 16 15:29:33 2014] [<ffffffff817e4c22>] system_call_fastpath+0x16/0x1b [Wed Apr 16 15:29:33 2014] Code: Bad RIP value. [Wed Apr 16 15:29:33 2014] RIP [<ffffffffa0003000>] 0xffffffffa0003000 [Wed Apr 16 15:29:33 2014] RSP <ffff8800db25dca0> [Wed Apr 16 15:29:33 2014] CR2: ffffffffa0003000 [Wed Apr 16 15:29:33 2014] ---[ end trace 3e88c173037af84b ]--- This splat is due to the fact that torture_init_begin() and torture_init_end() are both marked with __init, despite their use at runtime. This commit therefore removes __init from both functions. Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
| | | | * | torture: Check for multiple concurrent torture testsPaul E. McKenney2014-05-144-5/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The torture tests are designed to run in isolation, but do not enforce this isolation. This commit therefore checks for concurrent torture tests, and refuses to start new tests while old tests are running. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
| | | | * | locktorture: Remove reference to nonexistent Kconfig parameterPaul E. McKenney2014-05-141-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The locktorture module references CONFIG_LOCK_TORTURE_TEST_RUNNABLE, which does not exist. Which is a good thing, because otherwise randconfig testing could enable both rcutorture and locktorture concurrently, which the torture tests are not set up for. This commit therefore removes the reference, so that test is runnable immediately only when inserted as a module. Reported-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
| | | | * | rcutorture: Run rcu_torture_writer at normal priorityPaul E. McKenney2014-05-141-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are usually lots of readers and only one writer, so if there has to be a choice, we would want rcu_torture_writer to win. This commit therefore removes the set_user_nice() from rcu_torture_writer(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
| | | | * | rcutorture: Note diffs from git commitsPaul E. McKenney2014-05-141-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The current scripting only keeps track of the git SHA-1 of the current HEAD. This can cause confusion in cases where testing ran in a git tree where changes had not yet been checked in. This commit therefore also records the output of "git diff HEAD" to provide the information needed to reconstruct the source tree that was tested. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
| | | | * | rcutorture: Add missing destroy_timer_on_stack()Thomas Gleixner2014-05-141-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The rcu_torture_reader() function uses an on-stack timer_list structure which it initializes with setup_timer_on_stack(). However, it fails to use destroy_timer_on_stack() before exiting, which results in leaking a tracking object if DEBUG_OBJECTS is enabled. This commit therefore invokes destroy_timer_on_stack() to avoid this leakage. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
| | | | * | rcutorture: Explicitly test synchronous grace-period primitivesPaul E. McKenney2014-05-141-5/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The original rcu_torture_writer() avoided testing the synchronous grace-period primitives because they were simply wrappers around call_rcu() invocations. The testing of these synchronous primitives was delegated to the fake writers. However, there really is no excuse not to test them, especially in the case of SRCU, where the wrappering is somewhat more elaborate. This commit therefore makes the default rcutorture parameters cause rcu_torture_writer() to include synchronous grace-period primitives in its testing. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
| | | | * | rcutorture: Add tests for get_state_synchronize_rcu()Paul E. McKenney2014-05-141-35/+95
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit adds rcutorture testing for get_state_synchronize_rcu() and cond_synchronize_rcu(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
| | | | * | rcutorture: Test RCU-sched primitives in TREE_PREEMPT_RCU kernelsPaul E. McKenney2014-05-141-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit ensures that RCU-sched primitives are tested in TREE_PREEMPT_RCU kernels, a combination that was previously omitted. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
| | | | * | torture: Use elapsed time to detect hangsPaul E. McKenney2014-05-141-6/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The kvm-test-1-run.sh currently counts "sleep 1" commands to detect hangs. This can fail spectacularly on busy systems, where "sleep 1" might take far longer than one second to complete. This commit therefore changes hang detection to use elapsed time measurements. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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