diff options
| author | Mikael Pettersson <mikpe@it.uu.se> | 2008-07-31 02:40:50 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-07-31 02:40:50 +0400 |
| commit | d72609e17fd93bb2f7e0f7e1bdc70b6d20e43843 (patch) | |
| tree | d2b2ec57bbee2759e6cfdbc4269211dad888e79f /arch/sparc | |
| parent | 19fd3cabbabe5d37b83f833a1593592ed9878236 (diff) | |
| download | linux-d72609e17fd93bb2f7e0f7e1bdc70b6d20e43843.tar.xz | |
sparc64: FUTEX_OP_ANDN fix
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>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/include/asm/futex_64.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sparc/include/asm/futex_64.h b/arch/sparc/include/asm/futex_64.h index d8378935ae90..47f95839dc69 100644 --- a/arch/sparc/include/asm/futex_64.h +++ b/arch/sparc/include/asm/futex_64.h @@ -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); |