Dmitry Vyukov 43e76af85f kcov: ignore fault-inject and stacktrace
Don't instrument 3 more files that contain debugging facilities and
produce large amounts of uninteresting coverage for every syscall.

The following snippets are sprinkled all over the place in kcov traces
in a debugging kernel.  We already try to disable instrumentation of
stack unwinding code and of most debug facilities.  I guess we did not
use fault-inject.c at the time, and stacktrace.c was somehow missed (or
something has changed in kernel/configs).  This change both speeds up
kcov (kernel doesn't need to store these PCs, user-space doesn't need to
process them) and frees trace buffer capacity for more useful coverage.

  should_fail
  lib/fault-inject.c:149
  fail_dump
  lib/fault-inject.c:45

  stack_trace_save
  kernel/stacktrace.c:124
  stack_trace_consume_entry
  kernel/stacktrace.c:86
  stack_trace_consume_entry
  kernel/stacktrace.c:89
  ... a hundred frames skipped ...
  stack_trace_consume_entry
  kernel/stacktrace.c:93
  stack_trace_consume_entry
  kernel/stacktrace.c:86

Link: http://lkml.kernel.org/r/20200116111449.217744-1-dvyukov@gmail.com
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-01-31 10:30:41 -08:00
..
2019-09-20 09:06:26 -07:00
2018-08-22 10:52:48 -07:00
2018-10-12 09:17:46 +02:00
2018-08-16 12:14:42 -07:00
2017-02-24 17:46:57 -08:00
2020-01-29 15:25:34 -08:00
2019-12-07 11:00:19 -08:00
2018-10-16 13:45:44 +02:00
2019-07-11 15:17:41 -07:00
2018-06-27 18:58:49 +03:00
2018-10-15 16:31:29 -04:00
2017-08-15 09:02:07 -07:00