From: Michal Hocko <mhocko@suse.com>
To: Barry Song <21cnbao@gmail.com>
Cc: akpm@linux-foundation.org, linux-mm@kvack.org,
42.hyeyoo@gmail.com, cl@linux.com, hch@infradead.org,
iamjoonsoo.kim@lge.com, lstoakes@gmail.com, penberg@kernel.org,
rientjes@google.com, roman.gushchin@linux.dev, urezki@gmail.com,
v-songbaohua@oppo.com, vbabka@suse.cz,
virtualization@lists.linux.dev, hailong.liu@oppo.com,
torvalds@linux-foundation.org
Subject: Re: [PATCH RFC 5/5] non-mm: discourage the usage of __GFP_NOFAIL and encourage GFP_NOFAIL
Date: Wed, 24 Jul 2024 14:17:50 +0200 [thread overview]
Message-ID: <ZqDw7qoaopnYt3-P@tiehlicka> (raw)
In-Reply-To: <20240724085544.299090-6-21cnbao@gmail.com>
On Wed 24-07-24 20:55:44, Barry Song wrote:
> From: Barry Song <v-songbaohua@oppo.com>
>
> GFP_NOFAIL includes the meaning of block and direct reclamation, which
> is essential for a true no-fail allocation. We are gradually starting
> to enforce this block semantics to prevent the potential misuse of
> __GFP_NOFAIL in atomic contexts in the future.
>
> A typical example of incorrect usage is in VDPA, where GFP_ATOMIC
> and __GFP_NOFAIL are used together.
Ohh, so you have done the migration. Please squash those two patches.
Also if we want to preserve clean __GFP_NOFAIL for internal MM use then it
should be moved away from include/linux/gfp_types.h. But is there any
real use for that?
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2024-07-24 12:17 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-24 8:55 [PATCH 0/5] mm: clarify nofail memory allocation Barry Song
2024-07-24 8:55 ` [PATCH RFC 1/5] vpda: try to fix the potential crash due to misusing __GFP_NOFAIL Barry Song
2024-07-24 12:26 ` Michal Hocko
2024-07-24 22:50 ` Barry Song
2024-07-25 6:08 ` Michal Hocko
2024-07-25 7:00 ` Barry Song
2024-07-29 3:42 ` Jason Wang
2024-07-29 6:05 ` Barry Song
[not found] ` <CACGkMEuv4M_NaUQPHH59MPevGoJJoYb70LykcCODD=nUvik3ZQ@mail.gmail.com>
2024-07-30 3:08 ` Barry Song
2024-07-24 8:55 ` [PATCH 2/5] mm: Document __GFP_NOFAIL must be blockable Barry Song
2024-07-24 11:58 ` Michal Hocko
2024-08-03 23:09 ` Davidlohr Bueso
2024-07-24 8:55 ` [PATCH 3/5] mm: BUG_ON to avoid NULL deference while __GFP_NOFAIL fails Barry Song
2024-07-24 10:03 ` Vlastimil Babka
2024-07-24 10:11 ` Barry Song
2024-07-24 12:10 ` Michal Hocko
2024-07-24 8:55 ` [PATCH 4/5] mm: Introduce GFP_NOFAIL with the inclusion of __GFP_RECLAIM Barry Song
2024-07-24 12:12 ` Michal Hocko
2024-07-24 8:55 ` [PATCH RFC 5/5] non-mm: discourage the usage of __GFP_NOFAIL and encourage GFP_NOFAIL Barry Song
2024-07-24 9:53 ` Vlastimil Babka
2024-07-24 9:58 ` Barry Song
2024-07-24 13:14 ` Christoph Hellwig
2024-07-24 12:25 ` Michal Hocko
2024-07-24 13:13 ` Christoph Hellwig
2024-07-24 13:21 ` Michal Hocko
2024-07-24 13:23 ` Christoph Hellwig
2024-07-24 13:31 ` Michal Hocko
2024-07-24 13:33 ` Vlastimil Babka
2024-07-24 13:38 ` Christoph Hellwig
2024-07-24 13:47 ` Michal Hocko
2024-07-24 13:55 ` Christoph Hellwig
2024-07-24 14:39 ` Vlastimil Babka
2024-07-24 14:41 ` Christoph Hellwig
2024-07-25 1:47 ` Barry Song
2024-07-29 9:56 ` Barry Song
2024-07-29 10:03 ` Vlastimil Babka
2024-07-29 10:16 ` Barry Song
2024-07-24 12:17 ` Michal Hocko [this message]
2024-07-25 1:38 ` Barry Song
2024-07-25 6:16 ` Michal Hocko
2024-07-26 21:08 ` Davidlohr Bueso
2024-07-29 11:50 ` Michal Hocko
2024-08-03 22:15 ` Davidlohr Bueso
2024-08-05 7:49 ` Michal Hocko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ZqDw7qoaopnYt3-P@tiehlicka \
--to=mhocko@suse.com \
--cc=21cnbao@gmail.com \
--cc=42.hyeyoo@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=cl@linux.com \
--cc=hailong.liu@oppo.com \
--cc=hch@infradead.org \
--cc=iamjoonsoo.kim@lge.com \
--cc=linux-mm@kvack.org \
--cc=lstoakes@gmail.com \
--cc=penberg@kernel.org \
--cc=rientjes@google.com \
--cc=roman.gushchin@linux.dev \
--cc=torvalds@linux-foundation.org \
--cc=urezki@gmail.com \
--cc=v-songbaohua@oppo.com \
--cc=vbabka@suse.cz \
--cc=virtualization@lists.linux.dev \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox