[tip:,x86/urgent] x86/unwind/orc: Silence warnings caused by missing ORC data
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Message ID 161484789468.398.5338977176281362987.tip-bot2@tip-bot2
State Accepted
Commit b59cc97674c947861783ca92b9a6e7d043adba96
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  • [tip:,x86/urgent] x86/unwind/orc: Silence warnings caused by missing ORC data
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tip-bot2 for Jean-Philippe Brucker March 4, 2021, 8:51 a.m. UTC
The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     86402dcc894951c0a363b6aee12d955ff923b35e
Gitweb:        https://git.kernel.org/tip/86402dcc894951c0a363b6aee12d955ff923b35e
Author:        Josh Poimboeuf <jpoimboe@redhat.com>
AuthorDate:    Fri, 05 Feb 2021 08:24:03 -06:00
Committer:     Peter Zijlstra <peterz@infradead.org>
CommitterDate: Wed, 03 Mar 2021 16:56:30 +01:00

x86/unwind/orc: Silence warnings caused by missing ORC data

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>
Tested-by: Ivan Babrou <ivan@cloudflare.com>
Link: https://lkml.kernel.org/r/06d02c4bbb220bd31668db579278b0352538efbb.1612534649.git.jpoimboe@redhat.com
---
 arch/x86/kernel/unwind_orc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
diff mbox series

diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c
index 1bcc14c..a120253 100644
--- a/arch/x86/kernel/unwind_orc.c
+++ b/arch/x86/kernel/unwind_orc.c
@@ -13,7 +13,7 @@ 
 
 #define orc_warn_current(args...)					\
 ({									\
-	if (state->task == current)					\
+	if (state->task == current && !state->error)			\
 		orc_warn(args);						\
 })