diff options
| author | Heiko Carstens <hca@linux.ibm.com> | 2025-06-16 17:00:28 +0200 |
|---|---|---|
| committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2025-06-29 13:12:01 +0200 |
| commit | ac5bf0665011db2b4aa167e971195a166e0d8d2f (patch) | |
| tree | 0759a778c13de7cefdeabb38db8a97c69cd5062f | |
| parent | 839d364e41c064cb8bee1c028822f1e97b206ef6 (diff) | |
s390/page: Add memory clobber to page_set_storage_key()
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>
| -rw-r--r-- | arch/s390/include/asm/page.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h index 79db884b8e3e..843c5cba882f 100644 --- a/arch/s390/include/asm/page.h +++ b/arch/s390/include/asm/page.h @@ -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"); } } |