[PATCH] Ftrace : fix function_graph tracer OOPS
rostedt at goodmis.org
Wed Oct 14 14:01:24 EST 2009
On Thu, 2009-10-08 at 20:21 +0530, Sachin Sant wrote:
> Switch to LOAD_REG_ADDR().
> Signed-off-by : Sachin Sant <sachinp at in.ibm.com>
> diff -Naurp old/arch/powerpc/kernel/entry_64.S
> --- old/arch/powerpc/kernel/entry_64.S 2009-10-08 18:37:44.000000000
> +++ new/arch/powerpc/kernel/entry_64.S 2009-10-08 18:34:33.000000000
> @@ -1038,8 +1038,8 @@ _GLOBAL(mod_return_to_handler)
> * We are in a module using the module's TOC.
> * Switch to our TOC to run inside the core kernel.
> - LOAD_REG_IMMEDIATE(r4,ftrace_return_to_handler)
> - ld r2, 8(r4)
> + ld r2, PACATOC(r13)
> + LOAD_REG_ADDR(r4,ftrace_return_to_handler)
Actually, the loading of this register is not needed. The original used
the loading to get the r2.
I actually wrote a fix for this a month ago. I never sent it out because
I was distracted by other issues.
I'll send out the two patches I had now.
Could yo test them?
> bl .ftrace_return_to_handler
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