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

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Date:	Fri, 30 Oct 2009 15:59:00 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	"mingo@...e.hu" <mingo@...e.hu>, "hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [patch 3/3] x86_64, cpa: use only text section in
 set_kernel_text_rw/ro

On Fri, 2009-10-30 at 11:17 -0800, Suresh Siddha wrote:
> On Wed, 2009-10-28 at 19:06 -0700, Steven Rostedt wrote:
> > 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.
> 
> Steve, Good to go?

Yep. Sorry, during the testing I hit the jprobe vs function graph bug
and got distracted. But as for this patch set ...

Tested-by: Steven Rostedt <rostedt@...dmis.org>

Thanks,

-- Steve

> 
> If so, Ingo can you please consider this patchset?


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