Re: [PATCH v7 04/17] tracing: add static function tracer support for MIPS

Wu Zhangjin
2009-11-12T11:06:12Z

Hi, All

On Mon, 2009-11-09 at 23:31 +0800, Wu Zhangjin wrote:
[...]
>
> And to support module tracing, we need to enable -mlong-calls for the
> long call from modules space to kernel space. -mlong-calls load the
> address of _mcount to a register and then jump to it, so, the address is
> allowed to be 32bit long, but without -mlong-calls, for the instruction
> "jal _mcount" only left 26bit for the address of _mcount, which is not
> enough for jumping from the module space to kernel space.
[...]
> diff --git a/arch/mips/Makefile b/arch/mips/Makefile
[...]
> +else
> +cflags-y := -mlong-calls
> +endif

Just made dynamic ftracer work without the above patch.

Will send it out as v8 later.

any more feedbacks to this v7 patchset?

Thanks & Regards,
Wu Zhangjin