Re: [PATCH 04/11] ftrace: comment arch ftrace code
From: Andrew Morton
Date: Wed Oct 22 2008 - 15:28:30 EST
On Wed, 22 Oct 2008 15:16:33 -0400 (EDT)
Steven Rostedt <rostedt@xxxxxxxxxxx> 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().
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/