linux-kernel - Re: [PATCH 2/3] dm bufio: remove redundant __GFP

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Message-ID: <bae5bba3-a73e-4a5d-80f8-e1506d0a302e@vivo.com>
Date: Mon, 11 Aug 2025 20:58:50 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: Mikulas Patocka <mpatocka@...hat.com>
Cc: Alasdair Kergon <agk@...hat.com>, Mike Snitzer <snitzer@...nel.org>,
 "open list:DEVICE-MAPPER (LVM)" <dm-devel@...ts.linux.dev>,
 open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] dm bufio: remove redundant __GFP_NOWARN


在 2025/8/11 20:44, Mikulas Patocka 写道:
> Hi
>
> I think that GFP_NOWAIT already includes __GFP_NORETRY too. So, should we
> drop __GFP_NORETRY as well?
GFP_NOWAIT does not include __GFP_NORETRY:
#define GFP_NOWAIT (__GFP_KSWAPD_RECLAIM | __GFP_NOWARN)

GFP_NOWAIT tells the memory manager to only wake up kswapd to perform
memory reclamation, not to perform direct memory reclaim.  Even if the
request fails, no error message is printed.

Best regards,
Qianfeng
>
> Mikulas
>