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From: Steven Rostedt on 20 Mar 2010 18:00
On Fri, 2010-03-19 at 14:57 +0800, Li Zefan wrote:
> A symbol's value won't be recalc-ed until we save config file or
> enter the menu where the symbol sits.
>
> So If I enable OPTIMIZE_FOR_SIZE, and search FUNCTION_GRAPH_TRACER:
>
> Symbol: FUNCTION_GRAPH_TRACER [=y]
> Prompt: Kernel Function Graph Tracer
> Defined at kernel/trace/Kconfig:140
> Depends on: ... [=y] && (!X86_32 [=y] || !CC_OPTIMIZE_FOR_SIZE [=y])

[ off topic ]

I'm not sure we need that anymore. I think Thomas added a patch that can
disable the cases that gcc causes the function graph to fail.

I pushed a patch before that also runs a check at compile time to make
sure that gcc does not produce a bad mcount setup that would screw up
the function graph tracer.

http://lkml.org/lkml/2009/11/20/2

It probably still makes sense to add it.

-- Steve

> ...
>
> >From the dependency it should result in FUNCTION_GRAPH_TRACER=n,
> but it still shows FUNCTION_GRAPH_TRACER=y.
>
> Signed-off-by: Li Zefan <lizf(a)cn.fujitsu.com>
> ---
> scripts/kconfig/symbol.c | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
> index 6c8fbbb..dfef8d1 100644
> --- a/scripts/kconfig/symbol.c
> +++ b/scripts/kconfig/symbol.c
> @@ -750,6 +750,7 @@ struct symbol **sym_re_search(const char *pattern)
> return NULL;
> }
> }
> + sym_calc_value(sym);
> sym_arr[cnt++] = sym;
> }
> if (sym_arr)
> -- 1.6.3
> --
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