linux-kernel - Re: [PATCH] btrfs: remove unused pages

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Date:   Tue, 25 Jul 2023 14:49:13 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, Arnd Bergmann <arnd@...db.de>,
        kernel test robot <lkp@...el.com>,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        Qu Wenruo <wqu@...e.com>, Anand Jain <anand.jain@...cle.com>,
        Filipe Manana <fdmanana@...e.com>, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] btrfs: remove unused pages_processed variable

On Mon, Jul 24, 2023 at 02:19:15PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The only user of pages_processed was removed, so it's now a local write-only
> variable that can be eliminated as well:
> 
> fs/btrfs/extent_io.c:214:16: error: variable 'pages_processed' set but not used [-Werror,-Wunused-but-set-variable]
> 
> Fixes: 9480af8687200 ("btrfs: split page locking out of __process_pages_contig")
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202307241541.8w52nEnt-lkp@intel.com/
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks for the patch!
Reported-by: kernelci.org bot <bot@...nelci.org>
Link: https://lore.kernel.org/llvm/64c00cd4.630a0220.6ad79.0eac@mx.google.com/
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>  fs/btrfs/extent_io.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> index c0440a0988c9a..121edea2cfe85 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -211,7 +211,6 @@ static void __process_pages_contig(struct address_space *mapping,
>  	pgoff_t start_index = start >> PAGE_SHIFT;
>  	pgoff_t end_index = end >> PAGE_SHIFT;
>  	pgoff_t index = start_index;
> -	unsigned long pages_processed = 0;
>  	struct folio_batch fbatch;
>  	int i;
>  
> @@ -226,7 +225,6 @@ static void __process_pages_contig(struct address_space *mapping,
>  
>  			process_one_page(fs_info, &folio->page, locked_page,
>  					 page_ops, start, end);
> -			pages_processed += folio_nr_pages(folio);
>  		}
>  		folio_batch_release(&fbatch);
>  		cond_resched();
> -- 
> 2.39.2
>