linux-kernel - Re: [PATCH] oprofile: Fix format string mismatch in oprofile

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Date:	Tue, 29 Apr 2014 10:12:57 +0200
From:	Robert Richter <rric@...nel.org>
To:	Masanari Iida <standby24x7@...il.com>
Cc:	oprofile-list@...ts.sf.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] oprofile: Fix format string mismatch in oprofile_perf.c

On 29.04.14 09:22:20, Masanari Iida wrote:
> Fix format string mismatch in oprofile_perf_create_files.

Please provide a compiler warning.

> 
> Signed-off-by: Masanari Iida <standby24x7@...il.com>
> ---
>  drivers/oprofile/oprofile_perf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/oprofile/oprofile_perf.c b/drivers/oprofile/oprofile_perf.c
> index d5b2732..968e6dc 100644
> --- a/drivers/oprofile/oprofile_perf.c
> +++ b/drivers/oprofile/oprofile_perf.c
> @@ -146,7 +146,7 @@ static int oprofile_perf_create_files(struct dentry *root)

        unsigned int i;

        for (i = 0; i < num_counters; i++) {

>  		struct dentry *dir;
>  		char buf[4];
>  
> -		snprintf(buf, sizeof buf, "%d", i);
> +		snprintf(buf, sizeof buf, "%u", i);

Since num_counters is int we better fix this by changing the i
declaration to int which avoids comparing unsigned/signed.

-Robert

>  		dir = oprofilefs_mkdir(root, buf);
>  		oprofilefs_create_ulong(dir, "enabled", &counter_config[i].enabled);
>  		oprofilefs_create_ulong(dir, "event", &counter_config[i].event);
> -- 
> 2.0.0.rc1
> 
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