Date: Fri, 6 Mar 2009 15:06:12 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
       Andrew Morton <akpm@linux-foundation.org>,
       Nick Piggin <npiggin@suse.de>, Steven Rostedt <rostedt@goodmis.org>,
       Andi Kleen <andi@firstfloor.org>, linux-kernel@vger.kernel.org,
       Thomas Gleixner <tglx@linutronix.de>,
       Peter Zijlstra <peterz@infradead.org>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Arjan van de Ven <arjan@infradead.org>,
       Rusty Russell <rusty@rustcorp.com.au>, "H. Peter Anvin" <hpa@zytor.com>,
       Steven Rostedt <srostedt@redhat.com>
Subject: Re: [PATCH] x86: make text_poke() atomic using fixmap
Message-ID: <20090306140612.GA8566@elte.hu>
References: <20090302222254.GA31962@elte.hu> <49AC63FA.70801@redhat.com> <20090302230915.GA11626@elte.hu> <49AC6DEA.2050304@redhat.com> <20090302234910.GA17956@elte.hu> <49AC7453.8020307@redhat.com> <20090303002214.GA4147@elte.hu> <49AC7A5F.7080009@redhat.com> <49AD5B55.10002@redhat.com> <20090305103852.GD32407@elte.hu>
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* Ingo Molnar <mingo@elte.hu> wrote:

> 
> * Masami Hiramatsu <mhiramat@redhat.com> wrote:
> 
> > Hi Ingo,
> > 
> > Here is the patch which uses fixmaps instead of vmap in 
> > text_poke(). This made the code much simpler than I thought 
> > :).
> 
> Looks good to me at a quick glance albeit Linus had second 
> thoughts about using fixmaps for this in the past. But with 
> delayed-flush for vmaps i think fixmaps are again the simpler 
> and more robust - albeit more limited - choice ...
> 
> In any case, the x86 tree already unified fixmap.h so could 
> you please resend the whole series as a 0/3, 1/3, 2/3, 3/3 
> thing against tip:master, starting a new thread on lkml? (this 
> thread is already way too deep)

Ping? I think there's agreement and it would be nice to fix this 
in .30. Looks too complex for .29 - maybe backportable to .29.1 
if it stays problem-free in testing.

	Ingo
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