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authorPeter Zijlstra <peterz@infradead.org>2013-11-06 14:57:36 +0100
committerIngo Molnar <mingo@kernel.org>2014-01-12 10:37:15 +0100
commit93ea02bb84354370e51de803a9405f171f3edf88 (patch)
treedc7c7719fdfe0aed36eae3c2b374ced951e62a4c /arch/parisc
parent1de7da377bd880ff23917f78924d0e908329d978 (diff)
downloadop-kernel-dev-93ea02bb84354370e51de803a9405f171f3edf88.zip
op-kernel-dev-93ea02bb84354370e51de803a9405f171f3edf88.tar.gz
arch: Clean up asm/barrier.h implementations using asm-generic/barrier.h
We're going to be adding a few new barrier primitives, and in order to avoid endless duplication make more agressive use of asm-generic/barrier.h. Change the asm-generic/barrier.h such that it allows partial barrier definitions and fills out the rest with defaults. There are a few architectures (m32r, m68k) that could probably do away with their barrier.h file entirely but are kept for now due to their unconventional nop() implementation. Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Michael Ellerman <michael@ellerman.id.au> Cc: Michael Neuling <mikey@neuling.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Victor Kaplansky <VICTORK@il.ibm.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20131213150640.846368594@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/parisc')
-rw-r--r--arch/parisc/include/asm/Kbuild1
-rw-r--r--arch/parisc/include/asm/barrier.h35
2 files changed, 1 insertions, 35 deletions
diff --git a/arch/parisc/include/asm/Kbuild b/arch/parisc/include/asm/Kbuild
index a603b9e..8df06d0 100644
--- a/arch/parisc/include/asm/Kbuild
+++ b/arch/parisc/include/asm/Kbuild
@@ -5,3 +5,4 @@ generic-y += word-at-a-time.h auxvec.h user.h cputime.h emergency-restart.h \
poll.h xor.h clkdev.h exec.h
generic-y += trace_clock.h
generic-y += preempt.h
+generic-y += barrier.h
diff --git a/arch/parisc/include/asm/barrier.h b/arch/parisc/include/asm/barrier.h
deleted file mode 100644
index e77d834..0000000
--- a/arch/parisc/include/asm/barrier.h
+++ /dev/null
@@ -1,35 +0,0 @@
-#ifndef __PARISC_BARRIER_H
-#define __PARISC_BARRIER_H
-
-/*
-** This is simply the barrier() macro from linux/kernel.h but when serial.c
-** uses tqueue.h uses smp_mb() defined using barrier(), linux/kernel.h
-** hasn't yet been included yet so it fails, thus repeating the macro here.
-**
-** PA-RISC architecture allows for weakly ordered memory accesses although
-** none of the processors use it. There is a strong ordered bit that is
-** set in the O-bit of the page directory entry. Operating systems that
-** can not tolerate out of order accesses should set this bit when mapping
-** pages. The O-bit of the PSW should also be set to 1 (I don't believe any
-** of the processor implemented the PSW O-bit). The PCX-W ERS states that
-** the TLB O-bit is not implemented so the page directory does not need to
-** have the O-bit set when mapping pages (section 3.1). This section also
-** states that the PSW Y, Z, G, and O bits are not implemented.
-** So it looks like nothing needs to be done for parisc-linux (yet).
-** (thanks to chada for the above comment -ggg)
-**
-** The __asm__ op below simple prevents gcc/ld from reordering
-** instructions across the mb() "call".
-*/
-#define mb() __asm__ __volatile__("":::"memory") /* barrier() */
-#define rmb() mb()
-#define wmb() mb()
-#define smp_mb() mb()
-#define smp_rmb() mb()
-#define smp_wmb() mb()
-#define smp_read_barrier_depends() do { } while(0)
-#define read_barrier_depends() do { } while(0)
-
-#define set_mb(var, value) do { var = value; mb(); } while (0)
-
-#endif /* __PARISC_BARRIER_H */
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