linux-kernel - Re: [PATCH] writeback: fix call of incorrect macro

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Date:   Fri, 28 Apr 2023 15:09:21 +0200
From:   Jan Kara <jack@...e.cz>
To:     Maxim Korotkov <korotkov.maxim.s@...il.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
        Jens Axboe <axboe@...com>, Tejun Heo <tj@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH] writeback: fix call of incorrect macro

Hi!

Jens, can you please pickup this patch? It has fallen through the cracks.
Usually you tend to be picking up cgroup writeback stuff. Thanks!

								Honza

On Wed 12-04-23 17:31:03, Maxim Korotkov wrote:
> Hi,
> Will this patch be applied or rejected?
> best regards, Max
> 
> On 26.01.2023 16:52, Jan Kara wrote:
> > On Thu 19-01-23 13:44:43, Maxim Korotkov wrote:
> > >   the variable 'history' is of type u16, it may be an error
> > >   that the hweight32 macro was used for it
> > >   I guess macro hweight16 should be used
> > > 
> > > Found by Linux Verification Center (linuxtesting.org) with SVACE.
> > > 
> > > Fixes: 2a81490811d0 ("writeback: implement foreign cgroup inode detection")
> > > Signed-off-by: Maxim Korotkov <korotkov.maxim.s@...il.com>
> > 
> > Looks good to me, although it is mostly a theoretical issue - I don't see
> > how hweight32 could do any harm here. Anyway, feel free to add:
> > 
> > Reviewed-by: Jan Kara <jack@...e.cz>
> > 
> > 								Honza
> > 
> > > ---
> > >   fs/fs-writeback.c | 2 +-
> > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> > > index 6fba5a52127b..fc16123b2405 100644
> > > --- a/fs/fs-writeback.c
> > > +++ b/fs/fs-writeback.c
> > > @@ -829,7 +829,7 @@ void wbc_detach_inode(struct writeback_control *wbc)
> > >   		 * is okay.  The main goal is avoiding keeping an inode on
> > >   		 * the wrong wb for an extended period of time.
> > >   		 */
> > > -		if (hweight32(history) > WB_FRN_HIST_THR_SLOTS)
> > > +		if (hweight16(history) > WB_FRN_HIST_THR_SLOTS)
> > >   			inode_switch_wbs(inode, max_id);
> > >   	}
> > > -- 
> > > 2.37.2
> > > 
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR