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

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BugLink: https://bugs.launchpad.net/bugs/2114239

[ Upstream commit a88c26bb8e04ee5f2678225c0130a5fbc08eef85 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Noah Wager <noah.wager@canonical.com>
Signed-off-by: Mehmet Basaran <mehmet.basaran@canonical.com>
This commit is contained in:
Sven Schnelle
2025-01-08 15:27:02 +01:00
committed by Mehmet Basaran
parent 632167cfbb
commit 64653208a8
1 changed files with 1 additions and 2 deletions
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arch/s390/include/asm/processor.h
+1 -2
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@@ -141,8 +141,7 @@ 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"