From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: Michal Hocko <mhocko@suse.com>
Cc: "Petr Mladek" <pmladek@suse.com>,
"Patrick Daly" <quic_pdaly@quicinc.com>,
"Mel Gorman" <mgorman@techsingularity.net>,
"David Hildenbrand" <david@redhat.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Sergey Senozhatsky" <senozhatsky@chromium.org>,
"Steven Rostedt" <rostedt@goodmis.org>,
"John Ogness" <john.ogness@linutronix.de>,
syzkaller-bugs@googlegroups.com,
"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
syzbot <syzbot+223c7461c58c58a4cb10@syzkaller.appspotmail.com>,
linux-mm <linux-mm@kvack.org>
Subject: Re: [PATCH] mm/page_alloc: fix potential deadlock on zonelist_update_seq seqlock
Date: Tue, 4 Apr 2023 20:19:45 +0900 [thread overview]
Message-ID: <c9633c4f-4593-4d1a-a5cc-99eb773023e0@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <ZCwEgC+GZwGhBw4u@dhcp22.suse.cz>
On 2023/04/04 20:05, Michal Hocko wrote:
> But you are right that GFP_ATOMIC allocations from IRQ context are quite
> common so this is a more general situation that doesn't really need to
> involve TTY and some locking oddities there.
Yes, that's why "[PATCH] mm/page_alloc: don't check zonelist_update_seq from
atomic allocations" was proposed; I consider that zonelist_update_seq should
not be checked from atomic context.
From lockdep perspective, keeping locking dependency simpler is the better,
even if we go with printk_deferred_enter()/printk_deferred_exit() approach.
next prev parent reply other threads:[~2023-04-04 11:20 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <000000000000b21f0a05e9ec310d@google.com>
[not found] ` <f6bd471c-f961-ef5e-21c5-bf158be19d12@linux.intel.com>
2023-04-02 10:48 ` [PATCH] mm/page_alloc: don't check zonelist_update_seq from atomic allocations Tetsuo Handa
2023-04-03 8:15 ` Michal Hocko
2023-04-03 11:14 ` Tetsuo Handa
2023-04-03 12:09 ` Michal Hocko
2023-04-03 12:51 ` Tetsuo Handa
2023-04-03 13:44 ` Michal Hocko
2023-04-03 15:12 ` Petr Mladek
2023-04-04 0:37 ` [PATCH] mm/page_alloc: fix potential deadlock on zonelist_update_seq seqlock Tetsuo Handa
2023-04-04 2:11 ` Sergey Senozhatsky
2023-04-04 7:43 ` Petr Mladek
2023-04-04 7:54 ` Michal Hocko
2023-04-04 8:20 ` Tetsuo Handa
2023-04-04 11:05 ` Michal Hocko
2023-04-04 11:19 ` Tetsuo Handa [this message]
2023-04-04 14:31 ` [PATCH v2] " Tetsuo Handa
2023-04-04 15:20 ` Michal Hocko
2023-04-05 9:02 ` Mel Gorman
2023-04-04 21:25 ` Andrew Morton
2023-04-05 8:28 ` Michal Hocko
2023-04-05 8:53 ` Petr Mladek
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