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

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Date:   Thu, 7 Dec 2017 16:08:24 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Qu Wenruo <quwenruo.btrfs@....com>
Cc:     Arnd Bergmann <arnd@...db.de>, 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 Thu, Dec 07, 2017 at 08:32:04AM +0800, Qu Wenruo wrote:
> 
> 
> On 2017年12月06日 22:18, 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=]
> 
> Any idea about which architecture will cause such warning?
> On x86_64 I always fail to get such warning.

The intel 0-day build bot compiles on various architectures and 32/64
setups, I'm not sure if this warning has been reported, no such mail in
my mboxes.