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authorSteven Rostedt <srostedt@redhat.com>2011-02-09 13:13:23 -0500
committerSteven Rostedt <rostedt@goodmis.org>2012-08-23 11:24:43 -0400
commit48bb5dc6cd9d30fe0d594947563da1f8bd9abada (patch)
treed6285f1c7ab68e07f9d65d62b62d6e958b66b0db /scripts
parenta0e0fac633bed47c15cab744663d8c67f8f3421d (diff)
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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>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/recordmcount.h4
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;