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Rafael J. Wysocki 8a102eed9c [PATCH] PM: Fix SMP races in the freezer ... Currently, to tell a task that it should go to the refrigerator, we set the PF_FREEZE flag for it and send a fake signal to it. Unfortunately there are two SMP-related problems with this approach. First, a task running on another CPU may be updating its flags while the freezer attempts to set PF_FREEZE for it and this may leave the task's flags in an inconsistent state. Second, there is a potential race between freeze_process() and refrigerator() in which freeze_process() running on one CPU is reading a task's PF_FREEZE flag while refrigerator() running on another CPU has just set PF_FROZEN for the same task and attempts to reset PF_FREEZE for it. If the refrigerator wins the race, freeze_process() will state that PF_FREEZE hasn't been set for the task and will set it unnecessarily, so the task will go to the refrigerator once again after it's been thawed. To solve first of these problems we need to stop using PF_FREEZE to tell tasks that they should go to the refrigerator. Instead, we can introduce a special TIF_*** flag and use it for this purpose, since it is allowed to change the other tasks' TIF_*** flags and there are special calls for it. To avoid the freeze_process()-refrigerator() race we can make freeze_process() to always check the task's PF_FROZEN flag after it's read its "freeze" flag. We should also make sure that refrigerator() will always reset the task's "freeze" flag after it's set PF_FROZEN for it. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: Russell King <rmk@arm.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Cc: Andi Kleen <ak@muc.de> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		18 years ago
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arch-aaec2000	[ARM] Clean up discontigmem support	18 years ago
arch-at91rm9200	[ARM] 3977/1: AT91: remove loop waiting for reset	18 years ago
arch-cl7500	Don't include linux/config.h from anywhere else in include/	19 years ago
arch-clps711x	[ARM] Clean up discontigmem support	18 years ago
arch-ebsa110	[ARM] ebsa110: fix warnings generated by asm/arch/io.h	18 years ago
arch-ebsa285	fix file specification in comments	19 years ago
arch-ep93xx	[PATCH] Cirrus Logic ep93xx ethernet driver	19 years ago
arch-h720x	fix file specification in comments	19 years ago
arch-imx	[ARM] 3991/1: i.MX/MX1 high resolution time source	18 years ago
arch-integrator	[ARM] 3631/1: Remove legacy __mem_isa() definitions	19 years ago
arch-iop13xx	[ARM] 3995/1: iop13xx: add iop13xx support	18 years ago
arch-iop32x	[ARM] 3851/1: iop3xx: add io-data glantank support	19 years ago
arch-iop33x	[ARM] 3832/1: iop3xx: coding style cleanup	19 years ago
arch-ixp4xx	Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm	18 years ago
arch-ixp23xx	[ARM] 3662/1: ixp23xx: don't include asm/hardware.h in uncompress.h	19 years ago
arch-ixp2000	[ARM] Fix decompressor serial IO to give CRLF not LFCR	19 years ago
arch-l7200	[ARM] Remove "translated" io macros	18 years ago
arch-lh7a40x	[ARM] Clean up discontigmem support	18 years ago
arch-netx	[ARM] 3631/1: Remove legacy __mem_isa() definitions	19 years ago
arch-omap	WorkQueue: Fix up arch-specific work items where possible	18 years ago
arch-pnx4008	i2c: New Philips PNX bus driver	18 years ago
arch-pxa	[PATCH] spi: stabilize PIO mode transfers on PXA2xx systems	18 years ago
arch-realview	[ARM] 3631/1: Remove legacy __mem_isa() definitions	19 years ago
arch-rpc	[ARM] Move FLUSH_BASE macros to asm/arch/memory.h	19 years ago
arch-s3c2410	[PATCH] s3c2410fb: Add support for STN displays	18 years ago
arch-sa1100	[ARM] Merge individual ARM sub-trees	18 years ago
arch-shark	fix file specification in comments	19 years ago
arch-versatile	[PATCH] arm-versatile iomem annotations	19 years ago
hardware	Initial blind fixup for arm for irq changes	19 years ago
mach	[ARM] Remove compatibility layer for ARM irqs	18 years ago
Kbuild	Add empty Kbuild files for 'make headers_install' in remaining arches.	19 years ago
a.out.h	Linux-2.6.12-rc2	20 years ago
apm.h	Don't include linux/config.h from anywhere else in include/	19 years ago
assembler.h	[ARM] Remove MODE_(SVC|IRQ|FIQ|USR) and DEFAULT_FIQ	19 years ago
atomic.h	[ARM] 3810/1: switch atomic helpers over to raw_local_irq_{save,restore}	19 years ago
auxvec.h	[PATCH] auxiliary vector cleanups	20 years ago
bitops.h	[ARM] 3852/1: convert atomic bitops and __xchg over to raw_local_irq_{save,restore}	19 years ago
bug.h	[ARM] 3983/2: remove unused argument to __bug()	18 years ago
bugs.h	[ARM] nommu: adjust headers for !MMU ARM systems	19 years ago
byteorder.h	[ARM] Fix byte order macros for Thumb	19 years ago
cache.h	[PATCH] Kill L1_CACHE_SHIFT_MAX	19 years ago
cacheflush.h	[ARM] Use CPU_CACHE_* where possible in asm/cacheflush.h	19 years ago
checksum.h	[NET]: ARM checksum annotations and cleanups.	18 years ago
cnt32_to_63.h	[ARM] 3978/1: macro to provide a 63-bit value from a 32-bit hardware counter	18 years ago
cpu-multi32.h	[PATCH] qualifiers in return types - easy cases	20 years ago
cpu-single.h	[PATCH] qualifiers in return types - easy cases	20 years ago
cpu.h	Don't include linux/config.h from anywhere else in include/	19 years ago
cputime.h	Linux-2.6.12-rc2	20 years ago
current.h	Linux-2.6.12-rc2	20 years ago
delay.h	[ARM] 3346/1: Fix udelay() for HZ values different from 100	19 years ago
device.h	Driver core: add dev_archdata to struct device	18 years ago
div64.h	[ARM] 3611/4: optimize do_div() when divisor is constant	18 years ago
dma-mapping.h	[PATCH] Add struct dev pointer to dma_is_consistent()	18 years ago
dma.h	Don't include linux/config.h from anywhere else in include/	19 years ago
domain.h	[ARM] nommu: adjust headers for !MMU ARM systems	19 years ago
dyntick.h	[ARM] 3692/1: ARM: coswitch irq handling to the generic implementation	19 years ago
ecard.h	Linux-2.6.12-rc2	20 years ago
elf.h	[ARM] 3881/4: xscale: clean up cp0/cp1 handling	18 years ago
emergency-restart.h	[PATCH] Add emergency_restart()	20 years ago
errno.h	Linux-2.6.12-rc2	20 years ago
fcntl.h	[PATCH] Clean up struct flock64 definitions	20 years ago
fiq.h	Linux-2.6.12-rc2	20 years ago
flat.h	[ARM] nommu: create flat.h to support uClinux flat binaries	19 years ago
floppy.h	[PATCH] ARM: fixup irqflags breakage after ARM genirq merge	19 years ago
fpstate.h	[ARM] 3370/2: ep93xx: add crunch support	19 years ago
futex.h	[PATCH] consolidate asm/futex.h	19 years ago
glue.h	Don't include linux/config.h from anywhere else in include/	19 years ago
hardirq.h	Don't include linux/config.h from anywhere else in include/	19 years ago
hardware.h	Linux-2.6.12-rc2	20 years ago
hw_irq.h	[PATCH] misc arm pt_regs fixes	19 years ago
ide.h	[PATCH] ARM: 2758/1: Fix comment in file header to read "ARM" instead i386	20 years ago
io.h	[ARM] Remove warnings for __io_pci and __arch_(get|put)*	18 years ago
ioctl.h	[PATCH] Generic ioctl.h	19 years ago
ioctls.h	Linux-2.6.12-rc2	20 years ago
ipc.h	Linux-2.6.12-rc2	20 years ago
ipcbuf.h	Linux-2.6.12-rc2	20 years ago
irq.h	[ARM] 3692/1: ARM: coswitch irq handling to the generic implementation	19 years ago
irq_regs.h	Initial blind fixup for arm for irq changes	19 years ago
irqflags.h	[ARM] Add ARM irqtrace support	19 years ago
kmap_types.h	Linux-2.6.12-rc2	20 years ago
leds.h	Don't include linux/config.h from anywhere else in include/	19 years ago
limits.h	Linux-2.6.12-rc2	20 years ago
linkage.h	Linux-2.6.12-rc2	20 years ago
local.h	Linux-2.6.12-rc2	20 years ago
locks.h	[ARM] 3019/1: fix wrong comments	20 years ago
mc146818rtc.h	Linux-2.6.12-rc2	20 years ago
memory.h	[ARM] Clean up discontigmem support	18 years ago
mman.h	[PATCH] add asm-generic/mman.h	19 years ago
mmu.h	[ARM] Add section support to ioremap	19 years ago
mmu_context.h	[ARM] Add section support to ioremap	19 years ago
mmzone.h	Linux-2.6.12-rc2	20 years ago
module.h	Linux-2.6.12-rc2	20 years ago
msgbuf.h	Linux-2.6.12-rc2	20 years ago
mtd-xip.h	[MTD] XIP cleanup	20 years ago
mutex.h	[ARM] 3311/1: clean up include/asm-arm/mutex.h	19 years ago
namei.h	Linux-2.6.12-rc2	20 years ago
nwflash.h	Linux-2.6.12-rc2	20 years ago
page-nommu.h	[ARM] nommu: adjust headers for !MMU ARM systems	19 years ago
page.h	Merge master.kernel.org:/pub/scm/linux/kernel/git/tmlind/linux-omap-upstream into devel	19 years ago
param.h	[ARM] Move HZ definition into Kconfig	19 years ago
parport.h	Linux-2.6.12-rc2	20 years ago
pci.h	Don't include linux/config.h from anywhere else in include/	19 years ago
percpu.h	Linux-2.6.12-rc2	20 years ago
pgalloc.h	[ARM] nommu: adjust headers for !MMU ARM systems	19 years ago
pgtable-hwdef.h	[ARM] Set bit 4 on section mappings correctly depending on CPU	19 years ago
pgtable-nommu.h	[ARM] Fix nommu build	18 years ago
pgtable.h	[ARM] 3971/1: xsc3: get rid of L_PTE_COHERENT	18 years ago
poll.h	[PATCH] POLLRDHUP/EPOLLRDHUP handling for half-closed devices notifications	19 years ago
posix_types.h	Linux-2.6.12-rc2	20 years ago
proc-fns.h	[ARM] nommu: add ARM946E-S core support	19 years ago
processor.h	[ARM] Include asm/elf.h instead of asm/procinfo.h	18 years ago
procinfo.h	[ARM] Move HWCAP_* definitions to asm/elf.h	18 years ago
ptrace.h	[ARM] 3665/1: crunch: add ptrace support	19 years ago
resource.h	Linux-2.6.12-rc2	20 years ago
rtc.h	[PATCH] RTC subsystem: ARM cleanup	19 years ago
scatterlist.h	[ARM] Remove '__address' from scatterlist and convert to DMA API	19 years ago
sections.h	Linux-2.6.12-rc2	20 years ago
segment.h	Linux-2.6.12-rc2	20 years ago
semaphore-helper.h	Linux-2.6.12-rc2	20 years ago
semaphore.h	[ARM] sema_count() removal	19 years ago
sembuf.h	Linux-2.6.12-rc2	20 years ago
serial.h	Linux-2.6.12-rc2	20 years ago
setup.h	[PATCH] cleanup asm/setup.h userspace visibility	18 years ago
shmbuf.h	Linux-2.6.12-rc2	20 years ago
shmparam.h	Linux-2.6.12-rc2	20 years ago
sigcontext.h	Linux-2.6.12-rc2	20 years ago
siginfo.h	Linux-2.6.12-rc2	20 years ago
signal.h	[PATCH] ARM: fixup irqflags breakage after ARM genirq merge	19 years ago
sizes.h	Linux-2.6.12-rc2	20 years ago
smp.h	Don't include linux/config.h from anywhere else in include/	19 years ago
socket.h	[AF_UNIX]: Datagram getpeersec	19 years ago
sockios.h	Linux-2.6.12-rc2	20 years ago
spinlock.h	[PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks	19 years ago
spinlock_types.h	[PATCH] spinlock consolidation	20 years ago
stat.h	[ARM] 3106/2: ARM EABI: some syscall adjustments	19 years ago
statfs.h	[ARM] 3108/2: old ABI compat: statfs64 and fstatfs64	19 years ago
string.h	[PATCH] ARM: 2653/1: Fix memset and memzero macro double-reference of parameters	20 years ago
suspend.h	Linux-2.6.12-rc2	20 years ago
system.h	[ARM] nommu: manage the CP15 things	19 years ago
termbits.h	[PATCH] tty: preparatory structures for termios revamp	18 years ago
termios.h	Linux-2.6.12-rc2	20 years ago
therm.h	Linux-2.6.12-rc2	20 years ago
thread_info.h	[PATCH] PM: Fix SMP races in the freezer	18 years ago
thread_notify.h	[ARM] Add thread_notify infrastructure	19 years ago
timex.h	Linux-2.6.12-rc2	20 years ago
tlb.h	[ARM] noMMU: removes TLB codes in nommu mode	19 years ago
tlbflush.h	[ARM] 3759/2: Remove uses of %?	19 years ago
topology.h	Linux-2.6.12-rc2	20 years ago
traps.h	Linux-2.6.12-rc2	20 years ago
types.h	[PATCH] sab: consolidate kmem_bufctl_t	20 years ago
uaccess.h	[ARM] Add __must_check to uaccess functions	19 years ago
ucontext.h	[ARM] 3664/1: crunch: add signal frame save/restore	19 years ago
unaligned.h	[ARM] 3849/1: fix get_unaligned() for gcc >= 4.1	19 years ago
unistd.h	[PATCH] remove kernel syscalls	18 years ago
user.h	Linux-2.6.12-rc2	20 years ago
vfp.h	Linux-2.6.12-rc2	20 years ago
vfpmacros.h	[ARM] 3472/1: Use the D variants of FLDMIA/FSTMIA on ARMv6	19 years ago
vga.h	[PATCH] vgacon: make VGA_MAP_MEM take size, remove extra use	19 years ago
xor.h	Linux-2.6.12-rc2	20 years ago