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s390/page: Add memory clobber to page_set_storage_key()

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Add memory clobbers to the page_set_storage_key() inline assemblies. This
allows for data dependencies from other code, which is important to prevent
the compiler from reordering instructions if required.

Note that this doesn't fix a bug in existing code; this is just a
prerequisite for upcoming code changes.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Heiko Carstens
2025-06-16 17:00:28 +02:00
committed by Alexander Gordeev
parent 839d364e41
commit ac5bf06650
1 changed files with 4 additions and 2 deletions
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6
arch/s390/include/asm/page.h
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@@ -134,12 +134,14 @@ static inline void page_set_storage_key(unsigned long addr,
asm volatile(
" .insn rrf,0xb22b0000,%[skey],%[addr],8,0"
:
: [skey] "d" (skey), [addr] "a" (addr));
: [skey] "d" (skey), [addr] "a" (addr)
: "memory");
} else {
asm volatile(
" sske %[skey],%[addr]"
:
: [skey] "d" (skey), [addr] "a" (addr));
: [skey] "d" (skey), [addr] "a" (addr)
: "memory");
}
}