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* mm: VM_flags comment fixesHugh Dickins2008-08-163-4/+4
| | | | | | | | Try to comment away a little of the confusion between mm's vm_area_struct vm_flags and vmalloc's vm_struct flags: based on an idea by Ulrich Drepper. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'for-linus' of ↵Linus Torvalds2008-08-1511-63/+137
|\ | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6: security: Fix setting of PF_SUPERPRIV by __capable()
| * security: Fix setting of PF_SUPERPRIV by __capable()David Howells2008-08-1411-63/+137
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix the setting of PF_SUPERPRIV by __capable() as it could corrupt the flags the target process if that is not the current process and it is trying to change its own flags in a different way at the same time. __capable() is using neither atomic ops nor locking to protect t->flags. This patch removes __capable() and introduces has_capability() that doesn't set PF_SUPERPRIV on the process being queried. This patch further splits security_ptrace() in two: (1) security_ptrace_may_access(). This passes judgement on whether one process may access another only (PTRACE_MODE_ATTACH for ptrace() and PTRACE_MODE_READ for /proc), and takes a pointer to the child process. current is the parent. (2) security_ptrace_traceme(). This passes judgement on PTRACE_TRACEME only, and takes only a pointer to the parent process. current is the child. In Smack and commoncap, this uses has_capability() to determine whether the parent will be permitted to use PTRACE_ATTACH if normal checks fail. This does not set PF_SUPERPRIV. Two of the instances of __capable() actually only act on current, and so have been changed to calls to capable(). Of the places that were using __capable(): (1) The OOM killer calls __capable() thrice when weighing the killability of a process. All of these now use has_capability(). (2) cap_ptrace() and smack_ptrace() were using __capable() to check to see whether the parent was allowed to trace any process. As mentioned above, these have been split. For PTRACE_ATTACH and /proc, capable() is now used, and for PTRACE_TRACEME, has_capability() is used. (3) cap_safe_nice() only ever saw current, so now uses capable(). (4) smack_setprocattr() rejected accesses to tasks other than current just after calling __capable(), so the order of these two tests have been switched and capable() is used instead. (5) In smack_file_send_sigiotask(), we need to allow privileged processes to receive SIGIO on files they're manipulating. (6) In smack_task_wait(), we let a process wait for a privileged process, whether or not the process doing the waiting is privileged. I've tested this with the LTP SELinux and syscalls testscripts. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Acked-by: Casey Schaufler <casey@schaufler-ca.com> Acked-by: Andrew G. Morgan <morgan@kernel.org> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: James Morris <jmorris@namei.org>
* | Merge branch 'for-linus' of ↵Linus Torvalds2008-08-1562-2273/+3665
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/blackfin-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/blackfin-2.6: (33 commits) Blackfin arch: hook up some missing new system calls Blackfin arch: fix missing digit in SCLK range checking Blackfin arch: do not muck with the UART during boot -- let the serial driver worry about it Blackfin arch: clear EMAC_SYSTAT during IRQ init rather than early head.S as we dont need it setup that early Blackfin arch: use %pF when printing out the double fault address so we get symbol names Blackfin arch: add support for the BlackStamp board Blackfin arch: Allow ins functions to have a low latency version Blackfin arch: Print out doublefault addresses, so debug can occur Blackfin arch: shuffle related prototypes together -- no functional changes Blackfin arch: move fixed code defines into fixed_code.h as very few things actually need to know these details Blackfin arch: mark some functions as __init as they are only called from __init functions Blackfin arch: delete dead prototypes Blackfin arch: cleanup cache lock code Blackfin arch: workaround SIC_IWR1 reset bug, by keeping MDMA0/1 always enabled in SIC_IWR1. Blackfin arch: Fix bug - when expanding the trace buffer, it does not print out the decoded instruction. Blackfin arch: Fix Bug - System with EMAC driver enabled - Core not idling Blackfin arch: delete unused cache functions Blackfin arch: convert L2 defines to be the same as the L1 defines Blackfin arch: unify the duplicated portions of __start and split mach-specific pieces into _mach_early_start where they will be easier to trim over time Blackfin arch: add asm/thread_info.h for THREAD_SIZE define ...
| * | Blackfin arch: hook up some missing new system callsBryan Wu2008-08-142-1/+13
| | | | | | | | | | | | | | | Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: fix missing digit in SCLK range checkingMike Frysinger2008-08-141-1/+1
| | | | | | | | | | | | | | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: do not muck with the UART during boot -- let the serial ↵Mike Frysinger2008-08-146-183/+0
| | | | | | | | | | | | | | | | | | | | | | | | driver worry about it Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: clear EMAC_SYSTAT during IRQ init rather than early head.S as ↵Mike Frysinger2008-08-143-18/+5
| | | | | | | | | | | | | | | | | | | | | | | | we dont need it setup that early Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: use %pF when printing out the double fault address so we get ↵Mike Frysinger2008-08-141-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | symbol names Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: add support for the BlackStamp boardBenjamin Matthews2008-08-145-3/+1606
| | | | | | | | | | | | | | | | | | | | | Signed-off-by: Benjamin Matthews <bmat@lle.rochester.edu> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: Allow ins functions to have a low latency versionRobin Getz2008-08-142-0/+136
| | | | | | | | | | | | | | | | | | Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: Print out doublefault addresses, so debug can occurRobin Getz2008-08-142-1/+12
| | | | | | | | | | | | | | | | | | Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: shuffle related prototypes together -- no functional changesMike Frysinger2008-08-141-6/+6
| | | | | | | | | | | | | | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: move fixed code defines into fixed_code.h as very few things ↵Mike Frysinger2008-08-143-14/+25
| | | | | | | | | | | | | | | | | | | | | | | | actually need to know these details Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: mark some functions as __init as they are only called from ↵Mike Frysinger2008-08-147-9/+9
| | | | | | | | | | | | | | | | | | | | | | | | __init functions Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: delete dead prototypesMike Frysinger2008-08-141-5/+0
| | | | | | | | | | | | | | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: cleanup cache lock codeMike Frysinger2008-08-144-17/+39
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - remove cheesy read_iloc() function - move invalidate_entire_icache function to lock.S - export proper prototypes for functions in lock.S - only build lock.S when BFIN_ICACHE_LOCK is enabled Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: workaround SIC_IWR1 reset bug, by keeping MDMA0/1 always ↵Michael Hennerich2008-08-132-0/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | enabled in SIC_IWR1. This way we ensure that reboot succeeds. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: Fix bug - when expanding the trace buffer, it does not print ↵Robin Getz2008-08-061-35/+53
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | out the decoded instruction. as pointed out by Michael McTernan in the forums, when expanding the trace buffer, it does not print out the decoded instruction. Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: Fix Bug - System with EMAC driver enabled - Core not idlingMichael Hennerich2008-08-068-93/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Disable all bits in SIC_IWR unless we are going into a real (DPMC) power saving mode. Any Interrupt can wake the core form it's idle state. - Remove deep sleep mode as it is not going to be used anywhere: We support sleep, sleep deeper and hibernate. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: delete unused cache functionsMike Frysinger2008-08-131-115/+0
| | | | | | | | | | | | | | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: convert L2 defines to be the same as the L1 definesMike Frysinger2008-08-138-25/+34
| | | | | | | | | | | | | | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: unify the duplicated portions of __start and split ↵Mike Frysinger2008-08-066-649/+146
| | | | | | | | | | | | | | | | | | | | | | | | mach-specific pieces into _mach_early_start where they will be easier to trim over time Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: add asm/thread_info.h for THREAD_SIZE defineMike Frysinger2008-08-061-0/+1
| | | | | | | | | | | | | | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: move async memory programming into common setup_arch() as the ↵Mike Frysinger2008-08-066-130/+10
| | | | | | | | | | | | | | | | | | | | | | | | banks dont really need to be setup fully as early as head.S Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: make sure the BSS and kernel load address are 4 byte alignedMike Frysinger2008-08-062-0/+10
| | | | | | | | | | | | | | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: unify the duplicated _real_start functionsMike Frysinger2008-08-067-354/+77
| | | | | | | | | | | | | | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: remove support for Anomaly 05000125 as it doesnt exist on any ↵Mike Frysinger2008-08-067-178/+2
| | | | | | | | | | | | | | | | | | | | | | | | supported processor/silicon Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: Fix bugs - Make kgdb code apparent to app debugging.Sonic Zhang2008-08-051-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Skip single step if global interrupt disable bit is set. - Extend bernds' patch r4673 to skip single step in any interrupt entry that interrupts the code which is under single stepping. Bernds' patch only allow user space single stepping. Singed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: use symbolic IRQ_PF define rather than hardcodedMike Frysinger2008-08-053-3/+3
| | | | | | | | | | | | | | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: remove pata resources from generic boardMike Frysinger2008-08-058-322/+0
| | | | | | | | | | | | | | | | | | | | | | | | these are highly board specific, so putting into generic doesnt make much sense Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: add support for board tcm-bf537Mike Frysinger2008-08-134-0/+1290
| | | | | | | | | | | | | | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: add board resources for parallel flash on cm-bf537Mike Frysinger2008-08-051-0/+54
| | | | | | | | | | | | | | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: be consistant with parition names, and ensure the bus is ↵Robin Getz2008-08-0515-67/+67
| | | | | | | | | | | | | | | | | | | | | | | | identified Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: Functional power management supportMichael Hennerich2008-08-054-56/+45
| | | | | | | | | | | | | | | | | | | | | | | | | | | Merge VR Regulator Hibernate wakeups into set_irq_wake for internal interrupts. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: Fix bug - This change eliminates impact on application debuggingJie Zhang2008-08-051-7/+13
| | | | | | | | | | | | | | | | | | Signed-off-by: Jie Zhang <jie.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
| * | Blackfin arch: remove useless mtd defines in uClinuxMike Frysinger2008-08-051-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | dont bother protecting the mtd defines as anything that incorrectly uses it will get an error during link time anyways ... this prevents large pointless rebuilds of most files whenever the uclinux mtd map changes state Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
* | | Merge branch 'release-2.6.27' of ↵Linus Torvalds2008-08-153-19/+51
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-acpi-2.6 * 'release-2.6.27' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-acpi-2.6: cpuidle: Make ladder governor honor latency requirements fully cpuidle: Menu governor fix wrong usage of measured_us cpuidle: Do not use poll_idle unless user asks for it x86: Fix ioremap off by one BUG
| * \ \ Merge branch 'cpuidle' into release-2.6.27Andi Kleen2008-08-152-18/+50
| |\ \ \
| | * | | cpuidle: Make ladder governor honor latency requirements fullyvenkatesh.pallipadi@intel.com2008-08-151-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ladder governor only honored latency requirement when promoting C-states. Instead. it should check for latency requirement on each idle call, and demote to appropriate C-state when there is a latency requirement change. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * | | cpuidle: Menu governor fix wrong usage of measured_usvenkatesh.pallipadi@intel.com2008-08-151-12/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is a bug in menu governor where we have if (data->elapsed_us < data->elapsed_us + measured_us) with measured_us already having elapsed_us added in tickless case here unsigned int measured_us = cpuidle_get_last_residency(dev) + data->elapsed_us; Also, it should be last_residency, not measured_us, that need to be used to do comparing and distinguish between expected & non-expected events. Refactor menu_reflect() to fix these two problems. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Wei Gang <gang.wei@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * | | cpuidle: Do not use poll_idle unless user asks for itvenkatesh.pallipadi@intel.com2008-08-152-6/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | poll_idle was added to CPUIDLE, just as a low latency idle handler, to be used in cases when user desires CPUs not to enter any idle state at all. It was supposed to be a run time idle=poll option to the user. But, it was indeed getting used during normal menu and ladder governor default case, with no special user setting (Reported by Linus Torvalds). Change below ensures that poll_idle will not be used unless user explicitly asks pm_qos infrastructure for zero latency requirement. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
| * | | | Merge branch 'ioremap' into release-2.6.27Andi Kleen2008-08-151-1/+1
| |\ \ \ \
| | * | | | x86: Fix ioremap off by one BUGAndi Kleen2008-08-151-1/+1
| | |/ / / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Jean Delvare's machine triggered this BUG acpi_os_map_memory phys ffff0000 size 65535 ------------[ cut here ]------------ kernel BUG at arch/x86/mm/pat.c:233! with ACPI in the backtrace. Adding some debugging output showed that ACPI calls acpi_os_map_memory phys ffff0000 size 65535 And ioremap/PAT does this check in 32bit, so addr+size wraps and the BUG in reserve_memtype() triggers incorrectly. BUG_ON(start >= end); /* end is exclusive */ But reserve_memtype already uses u64: int reserve_memtype(u64 start, u64 end, so the 32bit truncation must happen in the caller. Presumably in ioremap when it passes this information to reserve_memtype(). This patch does this computation in 64bit. http://bugzilla.kernel.org/show_bug.cgi?id=11346 Signed-off-by: Andi Kleen <ak@linux.intel.com>
* | | | | Merge branch 'for-linus' of ↵Linus Torvalds2008-08-155-32/+77
|\ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6: ALSA: wm8990: Implement speaker volume PGA ALSA: wm8990: Fix routing of left DAC to speaker mixer ALSA: virtuoso: add Xonar D1 support
| * | | | | ALSA: wm8990: Implement speaker volume PGAMark Brown2008-08-152-4/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The latest revisions of the WM8990 provide a programmable gain amplifier for the speaker - configure the register cache and implement controls for this. Older revisions of the device ignore writes to these controls. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
| * | | | | ALSA: wm8990: Fix routing of left DAC to speaker mixerMark Brown2008-08-151-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
| * | | | | ALSA: virtuoso: add Xonar D1 supportClemens Ladisch2008-08-143-27/+58
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for the Asus Xonar D1. It is the same as the DX, but without the external power detection. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
* | | | | | hwmon-vid: Fix AMD K8 VID decodingJean Delvare2008-08-151-8/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Not all AMD K8 have 6 VID pins, contrary to what was assumed in commit 116d0486bdefc11f71e567cadf0c47f788b4dd06. This commit broke support of older CPU models which have only 5 VID pins: http://bugzilla.kernel.org/show_bug.cgi?id=11329 We need two entries in the hwmon-vid table, one for 5-bit VID models (K8 revision <= E) and one for 6-bit VID models (K8 revision >= F). This fixes bug #11329. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Frank Myhr <fmyhr@fhmtech.com> Tested-by: Jean-Luc Coulon <jean.luc.coulon@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | | | | x86: add MAP_STACK mmap flagIngo Molnar2008-08-151-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | as per this discussion: http://lkml.org/lkml/2008/8/12/423 Pardo reported that 64-bit threaded apps, if their stacks exceed the combined size of ~4GB, slow down drastically in pthread_create() - because glibc uses MAP_32BIT to allocate the stacks. The use of MAP_32BIT is a legacy hack - to speed up context switching on certain early model 64-bit P4 CPUs. So introduce a new flag to be used by glibc instead, to not constrain 64-bit apps like this. glibc can switch to this new flag straight away - it will be ignored by the kernel. If those old CPUs ever matter to anyone, support for it can be implemented. Signed-off-by: Ingo Molnar <mingo@elte.hu> Acked-by: Ulrich Drepper <drepper@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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