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objtool: Add check_kcov_mode() to the uaccess safelist 

check_kcov_mode() is called by write_comp_data() and
__sanitizer_cov_trace_pc(), which are already on the uaccess safe list.
It's notrace and doesn't call out to anything else, so add it to the
list too.

This fixes the following warnings:

  kernel/kcov.o: warning: objtool: __sanitizer_cov_trace_pc()+0x15: call to check_kcov_mode() with UACCESS enabled
  kernel/kcov.o: warning: objtool: write_comp_data()+0x1b: call to check_kcov_mode() with UACCESS enabled

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
This commit is contained in:
Josh Poimboeuf 2020-04-29 14:09:04 -05:00
parent 9d907f1ae8
commit ae033f088f
1 changed files with 1 additions and 0 deletions
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tools/objtool/check.c
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@ -507,6 +507,7 @@ static const char *uaccess_safe_builtin[] = {
"__asan_report_store16_noabort",
/* KCOV */
"write_comp_data",
"check_kcov_mode",
"__sanitizer_cov_trace_pc",
"__sanitizer_cov_trace_const_cmp1",
"__sanitizer_cov_trace_const_cmp2",