The patch titled
Subject: kcov: don't trace the code coverage code
has been removed from the -mm tree. Its filename was
kcov-dont-trace-the-code-coverage-code.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
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
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