linux-kernel - Re: [PATCH 2/2] xfs: Fix false positive lockdep warning with sb_internal & fs

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Message-ID: <20200615232802.GX2040@dread.disaster.area>
Date:   Tue, 16 Jun 2020 09:28:02 +1000
From:   Dave Chinner <david@...morbit.com>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     Waiman Long <longman@...hat.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        Qian Cai <cai@....pw>, Eric Sandeen <sandeen@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/2] xfs: Fix false positive lockdep warning with
 sb_internal & fs_reclaim

On Mon, Jun 15, 2020 at 09:43:51AM -0700, Darrick J. Wong wrote:
> Also: Why not set PF_MEMALLOC_NOFS at the start of the freeze call
> chain?

Because there's no guarantee that we are always going to do this
final work in the freeze syscall context? i.e. the state is specific
to the context in which we are running the transaction, not the
task context it is running in...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com