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

From: Andrew Morton
Date: Wed Sep 24 2014 - 17:59:35 EST

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


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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