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sparc64: FUTEX_OP_ANDN fix

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Correct sparc64's implementation of FUTEX_OP_ANDN to do a
bitwise negate of the oparg parameter before applying the
AND operation. All other archs that support FUTEX_OP_ANDN
either negate oparg explicitly (frv, ia64, mips, sh, x86),
or do so indirectly by using an and-not instruction (powerpc).
Since sparc64 has and-not, I chose to use that solution.

I've not found any use of FUTEX_OP_ANDN in glibc so the
impact of this bug is probably minor. But other user-space
components may try to use it so it should still get fixed.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mikael Pettersson 2008-07-30 15:40:50 -07:00 committed by David S. Miller
parent 19fd3cabba
commit d72609e17f
1 changed files with 1 additions and 1 deletions
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2
arch/sparc/include/asm/futex_64.h
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@ -59,7 +59,7 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
__futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_ANDN:
__futex_cas_op("and\t%2, %4, %1", ret, oldval, uaddr, oparg);
__futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_XOR:
__futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg);