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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>
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@ -261,11 +261,13 @@ static unsigned get_mcountsym(Elf_Sym const *const sym0,
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&sym0[Elf_r_sym(relp)];
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char const *symname = &str0[w(symp->st_name)];
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char const *mcount = gpfx == '_' ? "_mcount" : "mcount";
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char const *fentry = "__fentry__";
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if (symname[0] == '.')
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++symname; /* ppc64 hack */
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if (strcmp(mcount, symname) == 0 ||
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(altmcount && strcmp(altmcount, symname) == 0))
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(altmcount && strcmp(altmcount, symname) == 0) ||
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(strcmp(fentry, symname) == 0))
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mcountsym = Elf_r_sym(relp);
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return mcountsym;
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