linux-kernel - Re: [PATCH] Add a text

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Message-ID: <20131121124926.GB8044@home.goodmis.org>
Date:	Thu, 21 Nov 2013 07:49:26 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] Add a text_poke syscall

On Wed, Nov 20, 2013 at 08:42:03AM -0800, H. Peter Anvin wrote:
> We're talking user space here, which has different requirement (COW,
> memory protection, ...) which means it is not really the same code.  You
> can't take a page fault while patching the kernel.

Well, technically you can take a page fault while patching the kernel. It
happens all the time when patching modules (vmalloc'd).

But I get your point. You don't have to worry about COW or being paged
out. "page fault" is just too general of a term. And yes, I'm being anal ;-)

-- Steve

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