linux-kernel - Re: [PATCH -next] writeback: fix -Wformat compilation warnings

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Date:   Thu, 14 Nov 2019 11:21:18 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Qian Cai <cai@....pw>
Cc:     jack@...e.cz, gregkh@...uxfoundation.org, cgroups@...r.kernel.org,
        heiko.carstens@...ibm.com, gor@...ux.ibm.com,
        borntraeger@...ibm.com, linux-s390@...r.kernel.org,
        axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] writeback: fix -Wformat compilation warnings

On Thu, Nov 14, 2019 at 12:17:41PM -0500, Qian Cai wrote:
> The commit f05499a06fb4 ("writeback: use ino_t for inodes in
> tracepoints") introduced a lot of GCC compilation warnings on s390,
> 
> In file included from ./include/trace/define_trace.h:102,
>                  from ./include/trace/events/writeback.h:904,
>                  from fs/fs-writeback.c:82:
> ./include/trace/events/writeback.h: In function
> 'trace_raw_output_writeback_page_template':
> ./include/trace/events/writeback.h:76:12: warning: format '%lu' expects
> argument of type 'long unsigned int', but argument 4 has type 'ino_t'
> {aka 'unsigned int'} [-Wformat=]
>   TP_printk("bdi %s: ino=%lu index=%lu",
>             ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> ./include/trace/trace_events.h:360:22: note: in definition of macro
> 'DECLARE_EVENT_CLASS'
>   trace_seq_printf(s, print);     \
>                       ^~~~~
> ./include/trace/events/writeback.h:76:2: note: in expansion of macro
> 'TP_printk'
>   TP_printk("bdi %s: ino=%lu index=%lu",
>   ^~~~~~~~~
> 
> Fix them by adding necessary casts where ino_t could be either "unsigned
> int" or "unsigned long".
> 
> Fixes: f05499a06fb4 ("writeback: use ino_t for inodes in tracepoints")
> Signed-off-by: Qian Cai <cai@....pw>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun