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authorHuacai Chen <chenhuacai@loongson.cn>2024-05-14 06:24:18 +0200
committerHuacai Chen <chenhuacai@loongson.cn>2024-05-14 06:24:18 +0200
commitd6af2c76399f98444a5b4de96baf4b362d9f102b (patch)
treebcf24b1d1a36c8fac2e1ce4e31937738f6448d0f /arch/loongarch/include/asm
parentLoongArch: Give a chance to build with !CONFIG_SMP (diff)
downloadlinux-d6af2c76399f98444a5b4de96baf4b362d9f102b.tar.xz
linux-d6af2c76399f98444a5b4de96baf4b362d9f102b.zip
LoongArch: Fix callchain parse error with kernel tracepoint events again
With commit d3119bc985fb645 ("LoongArch: Fix callchain parse error with kernel tracepoint events"), perf can parse kernel callchain, but not complete and sometimes maybe error. The reason is LoongArch's unwinders (guess, prologue and orc) don't really need fp (i.e., regs[22]), and they use sp (i.e., regs[3]) as the frame address rather than the current stack pointer. Fix that by removing the assignment of regs[22], and instead assign the __builtin_frame_address(0) to regs[3]. Without fix: Children Self Command Shared Object Symbol ........ ........ ............. ................. ................ 33.91% 33.91% swapper [kernel.vmlinux] [k] __schedule | |--33.04%--__schedule | --0.87%--__arch_cpu_idle __schedule With this fix: Children Self Command Shared Object Symbol ........ ........ ............. ................. ................ 31.16% 31.16% swapper [kernel.vmlinux] [k] __schedule | |--20.63%--smpboot_entry | cpu_startup_entry | schedule_idle | __schedule | --10.53%--start_kernel cpu_startup_entry schedule_idle __schedule Fixes: d3119bc985fb645 ("LoongArch: Fix callchain parse error with kernel tracepoint events") Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/include/asm')
-rw-r--r--arch/loongarch/include/asm/perf_event.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/loongarch/include/asm/perf_event.h b/arch/loongarch/include/asm/perf_event.h
index 52b638059e40..f948a0676daf 100644
--- a/arch/loongarch/include/asm/perf_event.h
+++ b/arch/loongarch/include/asm/perf_event.h
@@ -13,8 +13,7 @@
#define perf_arch_fetch_caller_regs(regs, __ip) { \
(regs)->csr_era = (__ip); \
- (regs)->regs[3] = current_stack_pointer; \
- (regs)->regs[22] = (unsigned long) __builtin_frame_address(0); \
+ (regs)->regs[3] = (unsigned long) __builtin_frame_address(0); \
}
#endif /* __LOONGARCH_PERF_EVENT_H__ */