From: Christoph Hellwig <hch@lst.de>
To: "Darrick J. Wong" <djwong@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>, Carlos Maiolino <cem@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
Chris Li <sparse@chrisli.org>,
linux-sparse@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] xfs: work around sparse context tracking in xfs_qm_dquot_isolate
Date: Tue, 18 Nov 2025 07:00:32 +0100 [thread overview]
Message-ID: <20251118060032.GD22733@lst.de> (raw)
In-Reply-To: <20251114170623.GK196370@frogsfrogsfrogs>
On Fri, Nov 14, 2025 at 09:06:23AM -0800, Darrick J. Wong wrote:
> On Fri, Nov 14, 2025 at 06:52:25AM +0100, Christoph Hellwig wrote:
> > sparse gets confused by the goto after spin_trylock:
> >
> > fs/xfs/xfs_qm.c:486:33: warning: context imbalance in 'xfs_qm_dquot_isolate' - different lock contexts for basic block
> >
> > work around this by duplicating the trivial amount of code after the
> > label.
>
> Might want to leave a code comment about shutting up sparse so that
> someone doesn't revert this change to optimize LOC. That said ...
> what is the differing lock context? Does sparse not understand the
> spin_trylock?
So in case that my cover letter wasn't clear enough (or not widely read
:)), I'm somewhat doubtful about wanting to actually merge this upstream.
It just feels wrong to me. But it was the list thing to need a clean
compile, so I wanted to demonstrate it.
next prev parent reply other threads:[~2025-11-18 6:00 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-14 5:52 make xfs sparse-warning free Christoph Hellwig
2025-11-14 5:52 ` [PATCH 1/3] lockref: add a __cond_lock annotation for lockref_put_or_lock Christoph Hellwig
2025-11-14 18:18 ` Linus Torvalds
2025-11-18 5:58 ` Christoph Hellwig
2025-11-14 5:52 ` [PATCH 2/3] xfs: move some code out of xfs_iget_recycle Christoph Hellwig
2025-11-14 17:04 ` Darrick J. Wong
2025-11-14 17:28 ` Linus Torvalds
2025-11-18 5:59 ` Christoph Hellwig
2025-11-14 5:52 ` [PATCH 3/3] xfs: work around sparse context tracking in xfs_qm_dquot_isolate Christoph Hellwig
2025-11-14 17:06 ` Darrick J. Wong
2025-11-18 6:00 ` Christoph Hellwig [this message]
2025-11-14 17:56 ` make xfs sparse-warning free Linus Torvalds
2025-11-18 5:57 ` Christoph Hellwig
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