linux-kernel - Re: [RFC][PATCH] x86: make text

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Message-ID: <20090302102841.7e099670@infradead.org>
Date:	Mon, 2 Mar 2009 10:28:41 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"H. Peter Anvin" <hpa@...or.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [RFC][PATCH] x86: make text_poke() atomic

> 
> Use map_vm_area() instead of vmap() in text_poke() for avoiding page
> allocation and delayed unmapping, and call vunmap_page_range() and
> local_flush_tlb() directly because this mapping is temporary and
> local.
> 
> At the result of above change, text_poke() becomes atomic and can be
> called from stop_machine() etc.

.... but text_poke() realistically needs to call stop_machine() since
you can't poke live code.... so that makes me wonder how useful this
is...
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