Messages in this thread Patch in this message | | | Date | Thu, 31 Oct 2013 12:09:26 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH] recordmcount.pl: add support for __fentry__ |
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On Thu, 31 Oct 2013 15:59:58 +0000 Jamie Iles <jamie.iles@oracle.com> wrote:
> 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. > > Based on 48bb5dc6cd9d30fe0d594947563da1f8bd9abada (ftrace: Make > recordmcount.c handle __fentry__).
Why? All current users of __fentry__ use the C version of recordmcount. This just slows down the few archs that still use recordmcount.pl.
-- Steve
> > Cc: Steven Rostedt <rostedt@goodmis.org> > Signed-off-by: Jamie Iles <jamie.iles@oracle.com> > --- > scripts/recordmcount.pl | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl > index a674fd5..6460fc68 100755 > --- a/scripts/recordmcount.pl > +++ b/scripts/recordmcount.pl > @@ -214,7 +214,7 @@ $local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; > $weak_regex = "^[0-9a-fA-F]+\\s+([wW])\\s+(\\S+)"; > $section_regex = "Disassembly of section\\s+(\\S+):"; > $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; > -$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; > +$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s(mcount|__fentry__)\$"; > $section_type = '@progbits'; > $mcount_adjust = 0; > $type = ".long";
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