linux-kernel - Re: [PATCH 04/11] ftrace: comment arch ftrace code

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Date:	Wed, 22 Oct 2008 12:26:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, fweisbec@...il.com,
	sagar.abhishek@...il.com, davem@...emloft.net, tglx@...utronix.de,
	peterz@...radead.org, torvalds@...ux-foundation.org,
	srostedt@...hat.com
Subject: Re: [PATCH 04/11] ftrace: comment arch ftrace code

On Wed, 22 Oct 2008 15:16:33 -0400 (EDT)
Steven Rostedt <rostedt@...dmis.org> wrote:

> > Also, I hope that the above code is called from within a
> > pagefault_disable()d region?  Or are relying upon some magical
> > side-effect of something which happens to do the same thing as
> > pagefault_disable()?  IOW: by what means does the above code ensure
> > that do_page_fault() will see in_atomic()==true?
> 
> This code is called from kstop_machine, or simply has interrupts disabled.

in_atomic() doesn't test irqs_disabled()!

Still, probe_kernel_write() correctly handles the
secret-argument-passing to do_page_fault().

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