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[S390] fix futex_atomic_cmpxchg_inatomic 

futex_atomic_cmpxchg_inatomic has the same bug as the other
atomic futex operations: the operation needs to be done in the
user address space, not the kernel address space. Add the missing
sacf 256 & sacf 0.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2006-07-12 16:39:55 +02:00
parent 6ab4879a0d
commit 13492c50f6
1 changed files with 3 additions and 2 deletions
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5
include/asm-s390/futex.h
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@ -98,9 +98,10 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
return -EFAULT; return -EFAULT;
asm volatile(" cs %1,%4,0(%5)\n" asm volatile(" sacf 256\n"
" cs %1,%4,0(%5)\n"
"0: lr %0,%1\n" "0: lr %0,%1\n"
"1:\n" "1: sacf 0\n"
#ifndef __s390x__ #ifndef __s390x__
".section __ex_table,\"a\"\n" ".section __ex_table,\"a\"\n"
" .align 4\n" " .align 4\n"