s390/facility: Disable compile time optimization for decompressor code
[ Upstream commit 0147addc4fb72a39448b8873d8acdf3a0f29aa65 ] 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: Sasha Levin <sashal@kernel.org>
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1 changed files with 4 additions and 2 deletions
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@ -53,8 +53,10 @@ static inline int test_facility(unsigned long nr)
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unsigned long facilities_als[] = { FACILITIES_ALS };
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if (__builtin_constant_p(nr) && nr < sizeof(facilities_als) * 8) {
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if (__test_facility(nr, &facilities_als))
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return 1;
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if (__test_facility(nr, &facilities_als)) {
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if (!__is_defined(__DECOMPRESSOR))
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return 1;
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}
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}
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return __test_facility(nr, &S390_lowcore.stfle_fac_list);
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}
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