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linux/include/asm-i386
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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>
2006-12-13 09:05:49 -08:00
..
mach-bigsmp
mach-default [PATCH] paravirt: header and stubs for paravirtualisation 2006-12-07 02:14:07 +01:00
mach-es7000
mach-generic
mach-numaq
mach-summit [PATCH] i386: Fix compilation with UP genericarch 2006-11-28 20:12:59 +01:00
mach-visws [PATCH] visws build fix 2006-10-28 11:30:52 -07:00
mach-voyager IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
8253pit.h
a.out.h
acpi.h [PATCH] x86: Add acpi_user_timer_override option for Asus boards 2006-11-14 16:57:46 +01:00
agp.h
alternative-asm.i Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
alternative.h [PATCH] paravirt: Patch inline replacements for paravirt intercepts 2006-12-07 02:14:08 +01:00
apic.h [PATCH] paravirt: Add APIC accessors to paravirt-ops. 2006-12-07 02:14:08 +01:00
apicdef.h
arch_hooks.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
atomic.h Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6 2006-12-07 08:59:11 -08:00
auxvec.h
bitops.h
boot.h [PATCH] i386: Implement CONFIG_PHYSICAL_ALIGN 2006-12-07 02:14:04 +01:00
bug.h [PATCH] Generic BUG for i386 2006-12-08 08:28:39 -08:00
bugs.h [PATCH] paravirt: Allow selected bug checks to be 2006-12-07 02:14:08 +01:00
byteorder.h
cache.h
cacheflush.h
checksum.h [NET]: I386 checksum annotations and cleanups. 2006-12-02 21:23:19 -08:00
cpu.h [PATCH] i386: introduce the mechanism of disabling cpu hotplug control 2006-12-07 02:14:10 +01:00
cpufeature.h [PATCH] i386: i386 add Intel BTS cpufeature bit and detection (take 2) 2006-12-07 02:14:11 +01:00
cputime.h
current.h [PATCH] i386: Implement "current" with the PDA 2006-12-07 02:14:03 +01:00
debugreg.h
delay.h [PATCH] paravirt: header and stubs for paravirtualisation 2006-12-07 02:14:07 +01:00
desc.h [PATCH] paravirt: Patch inline replacements for paravirt intercepts 2006-12-07 02:14:08 +01:00
device.h ACPI: Change ACPI to use dev_archdata instead of firmware_data 2006-12-01 14:52:01 -08:00
div64.h
dma-mapping.h [PATCH] Pass struct dev pointer to dma_cache_sync() 2006-12-07 08:39:41 -08:00
dma.h
dmi.h
dwarf2.h [PATCH] i386/x86-64: Work around gcc bug with noreturn functions in unwinder 2006-09-26 10:52:41 +02:00
e820.h [PATCH] i386: Move memory map printing and other code to e820.c 2006-12-07 02:14:06 +01:00
edac.h
elf.h [PATCH] i386: Fix places where using %gs changes the usermode ABI 2006-12-07 02:14:02 +01:00
emergency-restart.h
errno.h
fcntl.h
fixmap.h [PATCH] x86: make __FIXADDR_TOP variable to allow it to make space for a hypervisor 2006-09-26 08:48:55 -07:00
floppy.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
frame.i Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
futex.h [PATCH] mm: pagefault_{disable,enable}() 2006-12-07 08:39:21 -08:00
genapic.h [PATCH] x86: fix the irqbalance quirk for E7320/E7520/E7525 2006-12-07 02:14:10 +01:00
hardirq.h
highmem.h
hpet.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
hw_irq.h [PATCH] i386/x86_64: Remove global IO_APIC_VECTOR 2006-10-08 12:24:02 -07:00
hypertransport.h [PATCH] Initial generic hypertransport interrupt support 2006-10-04 07:55:29 -07:00
i387.h [PATCH] i386: add sleazy FPU optimization 2006-12-07 02:14:01 +01:00
i8253.h
i8259.h
ide.h [PATCH] ide: more conversion to pci_get APIs 2006-12-08 08:29:03 -08:00
intel_arch_perfmon.h
io_apic.h i386: clean up io-apic accesses 2006-11-01 09:11:00 -08:00
io.h [PATCH] paravirt: header and stubs for paravirtualisation 2006-12-07 02:14:07 +01:00
ioctl.h
ioctls.h
ipc.h
ipcbuf.h
irq_regs.h [PATCH] i386: Store the interrupt regs pointer in the PDA 2006-12-07 02:14:03 +01:00
irq.h [PATCH] x86: fix the irqbalance quirk for E7320/E7520/E7525 2006-12-07 02:14:10 +01:00
irqflags.h [PATCH] paravirt: Patch inline replacements for paravirt intercepts 2006-12-07 02:14:08 +01:00
ist.h
k8.h
Kbuild [PATCH] cleanup asm/setup.h userspace visibility 2006-12-07 08:39:46 -08:00
kdebug.h
kexec.h [PATCH] i386: Avoid overwriting the current pgd (V4, i386) 2006-09-26 10:52:38 +02:00
kmap_types.h
kprobes.h
ldt.h
linkage.h
local.h
math_emu.h [PATCH] i386: PDA: Fix math emulator for new pt_regs 2006-12-07 02:14:03 +01:00
mc146818rtc.h
mca_dma.h [PATCH] kernel-doc for kernel/dma.c 2006-10-03 08:03:41 -07:00
mca.h
mce.h
mman.h
mmu_context.h [PATCH] i386: Use %gs as the PDA base-segment in the kernel 2006-12-07 02:14:02 +01:00
mmu.h
mmx.h
mmzone.h [PATCH] silence unused pgdat warning from alloc_bootmem_node and friends 2006-12-07 08:39:23 -08:00
module.h [PATCH] i386: always enable regparm 2006-12-07 02:14:12 +01:00
mpspec_def.h [PATCH] x86-64: remove remaining pc98 code 2006-12-07 02:14:19 +01:00
mpspec.h
msgbuf.h
msidef.h [PATCH] genirq: i386 irq: Move msi message composition into io_apic.c 2006-10-04 07:55:28 -07:00
msr.h Merge ../linus 2006-12-12 17:41:41 -05:00
mtrr.h
mutex.h
namei.h
nmi.h [PATCH] x86: all cpu backtrace 2006-12-07 02:14:01 +01:00
numa.h
numaq.h
page.h [PATCH] paravirt: Preparatory mmu header movement 2006-12-07 02:14:08 +01:00
param.h [PATCH] cleanup asm/setup.h userspace visibility 2006-12-07 08:39:46 -08:00
paravirt.h [PATCH] paravirt: Add MMU virtualization to paravirt_ops 2006-12-07 02:14:08 +01:00
parport.h
pci-direct.h
pci.h
pda.h [PATCH] i386: Store the interrupt regs pointer in the PDA 2006-12-07 02:14:03 +01:00
percpu.h [PATCH] i386: espfix cleanup 2006-12-07 02:14:01 +01:00
pgalloc.h
pgtable-2level-defs.h
pgtable-2level.h [PATCH] paravirt: fix missing pte update 2006-12-07 02:14:09 +01:00
pgtable-3level-defs.h
pgtable-3level.h [PATCH] paravirt: fix missing pte update 2006-12-07 02:14:09 +01:00
pgtable.h Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6 2006-12-07 08:59:11 -08:00
poll.h
posix_types.h
processor.h [PATCH] i386: cpu_detect extraction 2006-12-07 02:14:08 +01:00
ptrace-abi.h [PATCH] Split i386 and x86_64 ptrace.h 2006-09-26 08:49:10 -07:00
ptrace.h [PATCH] i386: Use %gs as the PDA base-segment in the kernel 2006-12-07 02:14:02 +01:00
resource.h
rtc.h
rwlock.h
rwsem.h [PATCH] lockdep: name some old style locks 2006-12-07 08:39:36 -08:00
scatterlist.h
seccomp.h
sections.h
segment.h [PATCH] paravirt: header and stubs for paravirtualisation 2006-12-07 02:14:07 +01:00
semaphore.h [PATCH] i386: Use early clobbers for semaphores now 2006-09-27 14:39:51 -07:00
sembuf.h
serial.h
setup.h Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6 2006-12-07 08:59:11 -08:00
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h
smp.h [PATCH] i386: Implement smp_processor_id() with the PDA 2006-12-07 02:14:03 +01:00
socket.h
sockios.h
sparsemem.h
spinlock_types.h [PATCH] Remove 'volatile' from spinlock_types 2006-12-06 14:39:53 -08:00
spinlock.h [PATCH] paravirt: Patch inline replacements for paravirt intercepts 2006-12-07 02:14:08 +01:00
srat.h
stacktrace.h [PATCH] i386: Do stacktracer conversion too 2006-09-26 10:52:34 +02:00
stat.h
statfs.h
string.h
suspend.h Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6 2006-12-07 08:59:11 -08:00
sync_bitops.h [PATCH] x86: implement always-locked bit ops, for memory shared with an SMP hypervisor 2006-09-26 08:48:55 -07:00
system.h [PATCH] paravirt: header and stubs for paravirtualisation 2006-12-07 02:14:07 +01:00
termbits.h [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
termios.h
therm_throt.h [PATCH] x86: Add a cumulative thermal throttle event counter. 2006-09-26 10:52:42 +02:00
thread_info.h [PATCH] PM: Fix SMP races in the freezer 2006-12-13 09:05:49 -08:00
time.h [PATCH] paravirt: header and stubs for paravirtualisation 2006-12-07 02:14:07 +01:00
timer.h
timex.h
tlb.h
tlbflush.h [PATCH] paravirt: Add MMU virtualization to paravirt_ops 2006-12-07 02:14:08 +01:00
topology.h [PATCH] sched: add option to serialize load balancing 2006-12-10 09:55:43 -08:00
tsc.h [PATCH] x86: remove config.h includes from asm-i386 & asm-x86_64 2006-09-26 10:52:36 +02:00
types.h [PATCH] Centralise definitions of sector_t and blkcnt_t 2006-12-04 19:41:15 -08:00
uaccess.h [PATCH] uaccess.h: match kernel-doc and function names 2006-10-11 11:14:24 -07:00
ucontext.h
unaligned.h
unistd.h [PATCH] remove kernel syscalls 2006-12-07 08:39:37 -08:00
unwind.h [PATCH] unwinder: more sanity checks in Dwarf2 unwinder 2006-12-07 02:14:13 +01:00
user.h
vga.h
vic.h [VOYAGER] fix up ptregs removal mess 2006-10-12 22:25:03 -05:00
vm86.h [PATCH] i386: Update sys_vm86 to cope with changed pt_regs and %gs usage 2006-12-07 02:14:03 +01:00
voyager.h [VOYAGER] fix up attribute packed specifiers in voyager.h 2006-10-12 22:23:18 -05:00
xor.h