linux-kernel - Re: [PATCH] mm: fix KPF

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Message-ID: <alpine.LSU.2.11.1702082045430.1818@eggly.anvils>
Date:   Wed, 8 Feb 2017 20:50:25 -0800 (PST)
From:   Hugh Dickins <hughd@...gle.com>
To:     Nicholas Piggin <npiggin@...il.com>
cc:     Hugh Dickins <hughd@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Wu Fengguang <fengguang.wu@...el.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: fix KPF_SWAPCACHE

On Thu, 9 Feb 2017, Nicholas Piggin wrote:
> On Tue, 7 Feb 2017 11:11:16 -0800 (PST)
> Hugh Dickins <hughd@...gle.com> wrote:
> 
> > 4.10-rc1 commit 6326fec1122c ("mm: Use owner_priv bit for PageSwapCache,
> > valid when PageSwapBacked") aliased PG_swapcache to PG_owner_priv_1:
> > so /proc/kpageflags' KPF_SWAPCACHE should now be synthesized, instead
> > of being shown on unrelated pages which have PG_owner_priv_1 set.
> > 
> > Signed-off-by: Hugh Dickins <hughd@...gle.com>
> 
> Thanks Hugh, this seems fine to me. We want this for 4.10, no?
> 
> Fixes: 6326fec1122c ("mm: Use owner_priv bit for PageSwapCache, valid when PageSwapBacked")
> Reviewed-by: Nicholas Piggin <npiggin@...il.com>

Thanks Nick, yes, but don't worry: Linus jumped to it, and it's already
in 4.10 as b6789123bccb ("mm: fix KPF_SWAPCACHE in /proc/kpageflags").

Hugh