The patch titled
Subject: kcov: Don't trace the code coverage code
has been added to the -mm tree. Its filename is
kcov-dont-trace-the-code-coverage-code.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kcov-dont-trace-the-code-coverage-code.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kcov-dont-trace-the-code-coverage-code.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: James Morse <james.morse@xxxxxxx>
Subject: kcov: Don't trace the code coverage code
Kcov causes the compiler to add a call to __sanitizer_cov_trace_pc() in
every basic block. Ftrace patches in a call to _mcount() to each function
it has annotated.
Letting these mechanisms annotate each other is a bad thing. Break the
loop by adding 'notrace' to __sanitizer_cov_trace_pc() so that ftrace
won't try to patch this code.
This patch lets arm64 with KCOV and STACK_TRACER boot.
Signed-off-by: James Morse <james.morse@xxxxxxx>
Acked-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/kcov.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/kcov.c~kcov-dont-trace-the-code-coverage-code kernel/kcov.c
--- a/kernel/kcov.c~kcov-dont-trace-the-code-coverage-code
+++ a/kernel/kcov.c
@@ -43,7 +43,7 @@ struct kcov {
* Entry point from instrumented code.
* This is called once per basic-block/edge.
*/
-void __sanitizer_cov_trace_pc(void)
+void notrace __sanitizer_cov_trace_pc(void)
{
struct task_struct *t;
enum kcov_mode mode;
_
Patches currently in -mm which might be from james.morse@xxxxxxx are
kcov-dont-trace-the-code-coverage-code.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
