From 318ca89bc578cad4cec2cd65ca9569a3c1b697be Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Thu, 10 Oct 2024 17:52:39 +0200 Subject: [PATCH] s390: Initialize psw mask in perf_arch_fetch_caller_regs() [ 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 Signed-off-by: Sasha Levin --- arch/s390/include/asm/perf_event.h | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/s390/include/asm/perf_event.h b/arch/s390/include/asm/perf_event.h index b9da71632827..ea340b901839 100644 --- a/arch/s390/include/asm/perf_event.h +++ b/arch/s390/include/asm/perf_event.h @@ -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); \