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s390/boot: Fix ESSA detection

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The cmma_test_essa() inline assembly uses tmp as input and output, however
tmp is specified as output only, which allows the compiler to optimize the
initialization of tmp away.

Therefore the ESSA detection may or may not work depending on previous
contents of the register that the compiler selected for tmp.

Fix this by using the correct constraint modifier.

Fixes: 468a3bc2b7 ("s390/cmma: move parsing of cmma kernel parameter to early boot code")
Cc: stable@vger.kernel.org
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2025-02-18 12:11:34 +01:00 • committed by Vasily Gorbik
parent 173767c218
commit c3a589fd9f
1 changed files with 1 additions and 1 deletions
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2
arch/s390/boot/startup.c
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@ -86,7 +86,7 @@ static int cmma_test_essa(void)
: [reg1] "=&d" (reg1),
[reg2] "=&a" (reg2),
[rc] "+&d" (rc),
[tmp] "=&d" (tmp),
[tmp] "+&d" (tmp),
"+Q" (get_lowcore()->program_new_psw),
"=Q" (old)
: [psw_old] "a" (&old),