linux-kernel - Re: [PATCH] fb_defio: Remove custom address_space

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Message-ID: <20210310184904.GS3479805@casper.infradead.org>
Date:   Wed, 10 Mar 2021 18:49:04 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     William Kucharski <william.kucharski@...cle.com>
Cc:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Ian Campbell <ijc@...lion.org.uk>,
        Jaya Kumar <jayakumar.lkml@...il.com>,
        Jani Nikula <jani.nikula@...el.com>,
        Christoph Hellwig <hch@....de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] fb_defio: Remove custom address_space_operations

On Wed, Mar 10, 2021 at 06:38:07PM +0000, William Kucharski wrote:
> Looks good, just one super minor nit inline.
> > @@ -228,13 +202,6 @@ void fb_deferred_io_cleanup(struct fb_info *info)
> > 
> > 	BUG_ON(!fbdefio);
> > 	cancel_delayed_work_sync(&info->deferred_work);
> > -
> > -	/* clear out the mapping that we setup */
> > -	for (i = 0 ; i < info->fix.smem_len; i += PAGE_SIZE) {
> > -		page = fb_deferred_io_page(info, i);
> > -		page->mapping = NULL;
> > -	}
> > -
> > 	mutex_destroy(&fbdefio->lock);
> > }
> 
> We no longer need the definition of "int i" right before the BUG_ON().

Huh.  Usually gcc warns about that.  let me figure that out and post a v2.