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s390/stackleak: Use exrl instead of ex in __stackleak_poison()

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exrl is present in all machines currently supported, therefore prefer
it over ex. This saves one instruction and doesn't need an additional
register to hold the address of the target instruction.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2025-01-08 15:27:02 +01:00 committed by Alexander Gordeev
parent 745600ed69
commit a88c26bb8e
1 changed files with 1 additions and 2 deletions
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arch/s390/include/asm/processor.h
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@ -163,8 +163,7 @@ static __always_inline void __stackleak_poison(unsigned long erase_low,
" la %[addr],256(%[addr])\n"
" brctg %[tmp],0b\n"
"1: stg %[poison],0(%[addr])\n"
" larl %[tmp],3f\n"
" ex %[count],0(%[tmp])\n"
" exrl %[count],3f\n"
" j 4f\n"
"2: stg %[poison],0(%[addr])\n"
" j 4f\n"