Messages in this thread | | | Date | Sat, 20 Jun 2009 18:24:06 -0400 (EDT) | From | Steven Rostedt <> | Subject | Re: [PATCH 1/2] function-graph: disable when both x86_32 and optimize for size are configured |
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On Sat, 20 Jun 2009, Ingo Molnar wrote:
> > * Steven Rostedt <rostedt@goodmis.org> wrote: > > > diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig > > index 4a13e5a..1eac852 100644 > > --- a/kernel/trace/Kconfig > > +++ b/kernel/trace/Kconfig > > @@ -121,6 +121,7 @@ config FUNCTION_GRAPH_TRACER > > bool "Kernel Function Graph Tracer" > > depends on HAVE_FUNCTION_GRAPH_TRACER > > depends on FUNCTION_TRACER > > + depends on !X86_32 || !CC_OPTIMIZE_FOR_SIZE > > default y > > Hm, nice fix, but this is a quite nasty constraint - distros like to > enable CC_OPTIMIZE_FOR_SIZE as it neatly trims the kernel's size by > about 30%. > > Just in case you have not checked yet: is there no way to turn off > the specific gcc optimization that causes this? Or is it -Os itself > that does this optimization?
It seems to me that -Os causes it for i386. I did a make V=1 to capture how the files in question were being compiled, and tried various disabling of flags. -Os was the only one to make a difference. :-(
-- Steve
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