linux-kernel - Re: [patch 3/3] x86_64, cpa: use only text section in set_kernel_text

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Message-Id: <1256781977.26028.2139.camel@gandalf.stny.rr.com>
Date:	Wed, 28 Oct 2009 22:06:17 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	mingo@...e.hu, hpa@...or.com, linux-kernel@...r.kernel.org
Subject: Re: [patch 3/3] x86_64, cpa: use only text section in
 set_kernel_text_rw/ro

On Wed, 2009-10-28 at 18:46 -0800, Suresh Siddha wrote:
> plain text document attachment (fix_kernel_text_ro_rw.patch)
> set_kernel_text_rw()/set_kernel_text_ro() are marking pages starting
> from _text to __start_rodata as RW or RO.
> 
> With CONFIG_DEBUG_RODATA, there might be free pages (associated with
> padding the sections to 2MB large page boundary) between text
> and rodata sections that are given back to page allocator. So we should
> use only use the start (__text) and end (__stop___ex_table) of the
> text section in set_kernel_text_rw()/set_kernel_text_ro().
> 
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
> ---
>  

I'll go ahead and test this to make sure it does not bust ftrace with an
allyesconfig.

Thanks,

-- Steve


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