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s390/xor: Fix xor_xc_5() inline assembly

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xor_xc_5() contains a larl 1,2f that is not used by the asm and is not
declared as a clobber. This can corrupt a compiler-allocated value in %r1
and lead to miscompilation. Remove the instruction.

Fixes: 745600ed69 ("s390/lib: Use exrl instead of ex in xor functions")
Cc: stable@vger.kernel.org
Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2026-03-02 19:03:34 +01:00
parent 11439c4635
commit 5f25805303
1 changed files with 0 additions and 1 deletions
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arch/s390/lib/xor.c
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@ -96,7 +96,6 @@ static void xor_xc_5(unsigned long bytes, unsigned long * __restrict p1,
const unsigned long * __restrict p5)
{
asm volatile(
" larl 1,2f\n"
" aghi %0,-1\n"
" jm 6f\n"
" srlg 0,%0,8\n"