linux-kernel - Re: [PATCH] mm: Fix the TLB range flushed when __tlb_remove

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Message-Id: <20130729.164106.943996066712571180.davem@davemloft.net>
Date:	Mon, 29 Jul 2013 16:41:06 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Vineet.Gupta1@...opsys.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, mgorman@...e.de, hughd@...gle.com,
	riel@...hat.com, rientjes@...gle.com, peterz@...radead.org,
	linux-arch@...r.kernel.org, catalin.marinas@....com,
	jcmvbkbc@...il.com
Subject: Re: [PATCH] mm: Fix the TLB range flushed when __tlb_remove_page()
 runs out of slots

From: Vineet Gupta <Vineet.Gupta1@...opsys.com>
Date: Wed, 29 May 2013 18:26:13 +0530

> zap_pte_range loops from @addr to @end. In the middle, if it runs out of
> batching slots, TLB entries needs to be flushed for @start to @interim,
> NOT @interim to @end.
> 
> Since ARC port doesn't use page free batching I can't test it myself but
> this seems like the right thing to do.
> Observed this when working on a fix for the issue at thread:
> 	http://www.spinics.net/lists/linux-arch/msg21736.html
> 
> Signed-off-by: Vineet Gupta <vgupta@...opsys.com>

As this bug can cause pretty serious memory corruption, I'd like to
see this submitted to -stable.

Thanks!
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