diff options
| author | Heiko Carstens <hca@linux.ibm.com> | 2024-09-13 15:05:37 +0200 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2024-09-13 17:28:36 +0200 |
| commit | 26d4959681e34a8479b8b7a9ef25ab27550562f6 (patch) | |
| tree | 80025509839dec3452bb1f810cfac50e45680519 | |
| parent | a6e23fb8d3c0e3904da70beaf5d7e840a983c97f (diff) | |
s390/facility: Disable compile time optimization for decompressor code
Disable compile time optimizations of test_facility() for the
decompressor. The decompressor should not contain any optimized code
depending on the architecture level set the kernel image is compiled
for to avoid unexpected operation exceptions.
Add a __DECOMPRESSOR check to test_facility() to enforce that
facilities are always checked during runtime for the decompressor.
Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
| -rw-r--r-- | arch/s390/include/asm/facility.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/s390/include/asm/facility.h b/arch/s390/include/asm/facility.h index b7d234838a36..65ebf86506cd 100644 --- a/arch/s390/include/asm/facility.h +++ b/arch/s390/include/asm/facility.h @@ -59,8 +59,10 @@ static inline int test_facility(unsigned long nr) unsigned long facilities_als[] = { FACILITIES_ALS }; if (__builtin_constant_p(nr) && nr < sizeof(facilities_als) * 8) { - if (__test_facility(nr, &facilities_als)) - return 1; + if (__test_facility(nr, &facilities_als)) { + if (!__is_defined(__DECOMPRESSOR)) + return 1; + } } return __test_facility(nr, &stfle_fac_list); } |