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| author | Steven Rostedt <srostedt@redhat.com> | 2011-02-09 13:13:23 -0500 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2012-08-23 11:24:43 -0400 |
| commit | 48bb5dc6cd9d30fe0d594947563da1f8bd9abada (patch) | |
| tree | d6285f1c7ab68e07f9d65d62b62d6e958b66b0db | |
| parent | a0e0fac633bed47c15cab744663d8c67f8f3421d (diff) | |
| download | lwn-48bb5dc6cd9d30fe0d594947563da1f8bd9abada.tar.gz lwn-48bb5dc6cd9d30fe0d594947563da1f8bd9abada.zip | |
ftrace: Make recordmcount.c handle __fentry__
With gcc 4.6.0 the -mfentry feature places the function profiling
call at the start of the function. When this is used, the call is
to __fentry__ and not mcount.
Change recordmcount.c to record both callers to __fentry__ and
mcount.
Link: http://lkml.kernel.org/r/20120807194058.990674363@goodmis.org
Acked-by: H. Peter Anvin <hpa@linux.intel.com>
Acked-by: John Reiser <jreiser@bitwagon.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| -rw-r--r-- | scripts/recordmcount.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/scripts/recordmcount.h b/scripts/recordmcount.h index 54e35c1e5948..9d1421e63ff8 100644 --- a/scripts/recordmcount.h +++ b/scripts/recordmcount.h @@ -261,11 +261,13 @@ static unsigned get_mcountsym(Elf_Sym const *const sym0, &sym0[Elf_r_sym(relp)]; char const *symname = &str0[w(symp->st_name)]; char const *mcount = gpfx == '_' ? "_mcount" : "mcount"; + char const *fentry = "__fentry__"; if (symname[0] == '.') ++symname; /* ppc64 hack */ if (strcmp(mcount, symname) == 0 || - (altmcount && strcmp(altmcount, symname) == 0)) + (altmcount && strcmp(altmcount, symname) == 0) || + (strcmp(fentry, symname) == 0)) mcountsym = Elf_r_sym(relp); return mcountsym; |