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arm: Remove bogus comment in futex_atomic_cmpxchg_inatomic() 

commit 522d7dec(futex: Remove redundant pagefault_disable in
futex_atomic_cmpxchg_inatomic()) added a bogus comment.

/* Note that preemption is disabled by futex_atomic_cmpxchg_inatomic
 * call sites. */

Bogus in two aspects:

1) pagefault_disable != preempt_disable even if the mechanism we use
   is the same

2) we have a call site which deliberately does not disable pagefaults
   as it wants the possible fault to be handled - though that has been
   changed for consistency reasons now.

Sigh. I really should have seen that when committing the above. :(

Catched-by-and-rightfully-ranted-at-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <alpine.LFD.2.00.1103141126590.2787@localhost6.localdomain6>
Cc: Michel Lespinasse <walken@google.com>
Cc: Darren Hart <darren@dvhart.com>
This commit is contained in:
Thomas Gleixner 2011-03-14 20:00:30 +01:00
parent 6e0aa9f8a8
commit 07d5ecae29
1 changed files with 0 additions and 3 deletions
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3
arch/arm/include/asm/futex.h
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@ -97,9 +97,6 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
return -EFAULT; return -EFAULT;
/* Note that preemption is disabled by futex_atomic_cmpxchg_inatomic
* call sites. */
__asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n" __asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n"
"1: " T(ldr) " %1, [%4]\n" "1: " T(ldr) " %1, [%4]\n"
" teq %1, %2\n" " teq %1, %2\n"