linux-kernel - Re: [PATCH] mm: softdirty: keep bit when zapping file pte

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Message-Id: <20140924145927.04e8eb7ba6c1410a797293c7@linux-foundation.org>
Date:	Wed, 24 Sep 2014 14:59:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Peter Feiner <pfeiner@...gle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Jamie Liu <jamieliu@...gle.com>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH] mm: softdirty: keep bit when zapping file pte

On Sat, 20 Sep 2014 01:03:07 -0700 Peter Feiner <pfeiner@...gle.com> wrote:

> Fixes the same bug as b43790eedd31e9535b89bbfa45793919e9504c34 and
> 9aed8614af5a05cdaa32a0b78b0f1a424754a958 where the return value of
> pte_*mksoft_dirty was being ignored.
> 
> To be sure that no other pte/pmd "mk" function return values were
> being ignored, I annotated the functions in
> arch/x86/include/asm/pgtable.h with __must_check and rebuilt.
> 

Grumble.

It is useful to identify preceding similar patches but that isn't a
good way of describing *this* patch.  What is wrong with the current
code, how does the patch fix it.

And, particularly, what do you think are the end-user visible effects
of the bug?  This info helps people to work out which kernel versions
need the fix.

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