Messages in this thread Patch in this message | | | Date | Tue, 07 Aug 2012 15:38:46 -0400 | From | Steven Rostedt <> | Subject | [RFC PATCH 1/4] ftrace: Make recordmcount.c handle __fentry__ |
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From: Steven Rostedt <srostedt@redhat.com>
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.
Cc: John Reiser <jreiser@bitwagon.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> --- scripts/recordmcount.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/scripts/recordmcount.h b/scripts/recordmcount.h index 54e35c1..9d1421e 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; -- 1.7.10.4
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