linux-kernel - Re: [PATCH] btrfs: tree-checker: use %zu format string for size

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Date:   Wed, 6 Dec 2017 15:23:01 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
        David Sterba <dsterba@...e.com>, Qu Wenruo <wqu@...e.com>,
        Su Yue <suy.fnst@...fujitsu.com>,
        Nikolay Borisov <nborisov@...e.com>,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] btrfs: tree-checker: use %zu format string for size_t

On Wed, Dec 06, 2017 at 03:18:14PM +0100, Arnd Bergmann wrote:
> The return value of sizeof() is of type size_t, so we must print it
> using the %z format modifier rather than %l to avoid this warning
> on some architectures:
> 
> fs/btrfs/tree-checker.c: In function 'check_dir_item':
> fs/btrfs/tree-checker.c:273:50: error: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'u32' {aka 'unsigned int'} [-Werror=format=]
> 
> Fixes: 005887f2e3e0 ("btrfs: tree-checker: Add checker for dir item")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: David Sterba <dsterba@...e.com>