linux-kernel - Re: block/blk-zoned.c:579:5-24: WARNING: atomic_dec_and_test variation before object free at line 583.

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Message-ID: <20241105153733.GA7219@lst.de>
Date: Tue, 5 Nov 2024 16:37:33 +0100
From: Christoph Hellwig <hch@....de>
To: Jens Axboe <axboe@...nel.dk>
Cc: Christoph Hellwig <hch@....de>, kernel test robot <lkp@...el.com>,
	Damien Le Moal <dlemoal@...nel.org>, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Hannes Reinecke <hare@...e.de>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Bart Van Assche <bvanassche@....org>
Subject: Re: block/blk-zoned.c:579:5-24: WARNING: atomic_dec_and_test
 variation before object free at line 583.

On Tue, Nov 05, 2024 at 08:36:33AM -0700, Jens Axboe wrote:
> On 11/5/24 8:34 AM, Christoph Hellwig wrote:
> > On Tue, Nov 05, 2024 at 06:52:25AM +0800, kernel test robot wrote:
> >>>> block/blk-zoned.c:579:5-24: WARNING: atomic_dec_and_test variation before object free at line 583.
> > 
> > Does anyone know what this warning is supposed to mean?
> 
> It's supposed to mean "use refcount_t for things like this".

Have we finally resolved the performance problems with refcount_t for
fast path operations?