From: Josh Poimboeuf <jpoimboe@redhat.com> mainline inclusion from mainline-v5.12-rc3 commit b59cc97674c947861783ca92b9a6e7d043adba96 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5LCHG CVE: NA -------------------------------- The ORC unwinder attempts to fall back to frame pointers when ORC data is missing for a given instruction. It sets state->error, but then tries to keep going as a best-effort type of thing. That may result in further warnings if the unwinder gets lost. Until we have some way to register generated code with the unwinder, missing ORC will be expected, and occasionally going off the rails will also be expected. So don't warn about it. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Tested-by: Ivan Babrou <ivan@cloudflare.com> Link: https://lkml.kernel.org/r/06d02c4bbb220bd31668db579278b0352538efbb.161253464... Signed-off-by: Yipeng Zou <zouyipeng@huawei.com> Reviewed-by: Zhang Jianhua <chris.zjh@huawei.com> Reviewed-by: Liao Chang <liaochang1@huawei.com> Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com> --- arch/x86/kernel/unwind_orc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c index eea8ec5eca3b..fe1bfb3eed89 100644 --- a/arch/x86/kernel/unwind_orc.c +++ b/arch/x86/kernel/unwind_orc.c @@ -11,7 +11,7 @@ #define orc_warn_current(args...) \ ({ \ - if (state->task == current) \ + if (state->task == current && !state->error) \ orc_warn(args); \ }) -- 2.25.1