tjh.dev / kernel
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s390/xor: Fix xor_xc_5() inline assembly

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: 745600ed6965 ("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>

Vasily Gorbik 5f258053 11439c46

-1
-1
arch/s390/lib/xor.c
··· 96 96 const unsigned long * __restrict p5) 97 97 { 98 98 asm volatile( 99 - " larl 1,2f\n" 100 99 " aghi %0,-1\n" 101 100 " jm 6f\n" 102 101 " srlg 0,%0,8\n"