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s390: Initialize psw mask in perf_arch_fetch_caller_regs()

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[ Upstream commit 223e7fb979fa06934f1595b6ad0ae1d4ead1147f ]

Also initialize regs->psw.mask in perf_arch_fetch_caller_regs().
This way user_mode(regs) will return false, like it should.

It looks like all current users initialize regs to zero, so that this
doesn't fix a bug currently. However it is better to not rely on callers
to do this.

Fixes: 914d52e46490 ("s390: implement perf_arch_fetch_caller_regs")
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Heiko Carstens 2024-10-10 17:52:39 +02:00 • committed by Ksawlii
parent 6d2bfe9d4d
commit ef949e86da
1 changed files with 1 additions and 0 deletions
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arch/s390/include/asm/perf_event.h
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@ -75,6 +75,7 @@ struct perf_sf_sde_regs {
#define SAMPLE_FREQ_MODE(hwc) (SAMPL_FLAGS(hwc) & PERF_CPUM_SF_FREQ_MODE)
#define perf_arch_fetch_caller_regs(regs, __ip) do { \
(regs)->psw.mask = 0; \
(regs)->psw.addr = (__ip); \
(regs)->gprs[15] = (unsigned long)__builtin_frame_address(0) - \
offsetof(struct stack_frame, back_chain); \