37a9d912b2
The cmpxchg_futex_value_locked API was funny in that it returned either the original, user-exposed futex value OR an error code such as -EFAULT. This was confusing at best, and could be a source of livelocks in places that retry the cmpxchg_futex_value_locked after trying to fix the issue by running fault_in_user_writeable(). This change makes the cmpxchg_futex_value_locked API more similar to the get_futex_value_locked one, returning an error code and updating the original value through a reference argument. Signed-off-by: Michel Lespinasse <walken@google.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> [tile] Acked-by: Tony Luck <tony.luck@intel.com> [ia64] Acked-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Michal Simek <monstr@monstr.eu> [microblaze] Acked-by: David Howells <dhowells@redhat.com> [frv] Cc: Darren Hart <darren@dvhart.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> LKML-Reference: <20110311024851.GC26122@google.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> |
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.. | ||
asm-offsets.h | ||
atomic.h | ||
atomic_32.h | ||
auxvec.h | ||
backtrace.h | ||
bitops.h | ||
bitops_32.h | ||
bitsperlong.h | ||
bug.h | ||
bugs.h | ||
byteorder.h | ||
cache.h | ||
cacheflush.h | ||
checksum.h | ||
compat.h | ||
cputime.h | ||
current.h | ||
delay.h | ||
device.h | ||
div64.h | ||
dma-mapping.h | ||
dma.h | ||
elf.h | ||
emergency-restart.h | ||
errno.h | ||
fcntl.h | ||
fixmap.h | ||
ftrace.h | ||
futex.h | ||
hardirq.h | ||
hardwall.h | ||
highmem.h | ||
homecache.h | ||
hugetlb.h | ||
hv_driver.h | ||
hw_irq.h | ||
ide.h | ||
io.h | ||
ioctl.h | ||
ioctls.h | ||
ipc.h | ||
ipcbuf.h | ||
irq.h | ||
irq_regs.h | ||
irqflags.h | ||
Kbuild | ||
kdebug.h | ||
kexec.h | ||
kmap_types.h | ||
linkage.h | ||
local.h | ||
memprof.h | ||
mman.h | ||
mmu.h | ||
mmu_context.h | ||
mmzone.h | ||
module.h | ||
msgbuf.h | ||
mutex.h | ||
opcode-tile.h | ||
opcode-tile_32.h | ||
opcode-tile_64.h | ||
opcode_constants.h | ||
opcode_constants_32.h | ||
opcode_constants_64.h | ||
page.h | ||
param.h | ||
pci.h | ||
percpu.h | ||
pgalloc.h | ||
pgtable.h | ||
pgtable_32.h | ||
poll.h | ||
posix_types.h | ||
processor.h | ||
ptrace.h | ||
resource.h | ||
scatterlist.h | ||
sections.h | ||
sembuf.h | ||
setup.h | ||
shmbuf.h | ||
shmparam.h | ||
sigcontext.h | ||
sigframe.h | ||
siginfo.h | ||
signal.h | ||
smp.h | ||
socket.h | ||
sockios.h | ||
spinlock.h | ||
spinlock_32.h | ||
spinlock_types.h | ||
stack.h | ||
stat.h | ||
statfs.h | ||
string.h | ||
swab.h | ||
syscall.h | ||
syscalls.h | ||
system.h | ||
termbits.h | ||
termios.h | ||
thread_info.h | ||
timex.h | ||
tlb.h | ||
tlbflush.h | ||
topology.h | ||
traps.h | ||
types.h | ||
uaccess.h | ||
ucontext.h | ||
unaligned.h | ||
unistd.h | ||
user.h | ||
xor.h |