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kcov: don't trace the code coverage code

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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 <[email protected]>
Acked-by: Dmitry Vyukov <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
James Morse 2016-04-28 16:18:52 -07:00 • committed by Linus Torvalds
commit bdab42dfc9
1 changed files with 1 additions and 1 deletions
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2
kernel/kcov.c
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@ -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;