linux-kernel - Re: [PATCH] ftrace, powerpc64: fix math to calculate offset in TOC

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Date:	Mon, 9 Feb 2009 12:16:20 -0800
From:	Geoff Levand <geoffrey.levand@...sony.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	LKML <linux-kernel@...r.kernel.org>, linuxppc-dev@...abs.org,
	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Arnd Bergmann <arnd@...db.de>,
	Remis Lima Baima <remis.developer@...glemail.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] ftrace, powerpc64: fix math to calculate offset in TOC

Steven Rostedt wrote:
> I found the bug that was causing large modules to fail in setting
> up dynamic ftrace. It wound up being a simple math error. To calculate
> the offset in the TOC, I had used an OR, but the bottom half was
> a signed extended short, and it should have been an addition.
> The fix is in my tree below, as well as posted here.
> ----
>  arch/powerpc/kernel/ftrace.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)

I tested this on PS3 with CONFIG_FTRACE_SELFTEST=y and
CONFIG_FTRACE_SELFTEST=y, and all modules now load and
the system seems to work properly.  I did not run any
tracer specific tests though.

Acked-by: Geoff Levand <geoffrey.levand@...sony.com>



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