linux-kernel - Re: [PATCH v2 3/3] lib/vsprintf: Force type of flags value for gfp

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Message-ID: <20200731164900.3ece67fb@oasis.local.home>
Date:   Fri, 31 Jul 2020 16:49:00 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-kernel@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH v2 3/3] lib/vsprintf: Force type of flags value for
 gfp_t

On Fri, 31 Jul 2020 21:08:24 +0300
Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:

> Sparse is not happy about restricted type being assigned:
>   lib/vsprintf.c:1940:23: warning: incorrect type in assignment (different base types)
>   lib/vsprintf.c:1940:23:    expected unsigned long [assigned] flags
>   lib/vsprintf.c:1940:23:    got restricted gfp_t [usertype]
> 
> Force type of flags value to make sparse happy.
> 
> Cc: Steven Rostedt (VMware) <rostedt@...dmis.org>

Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

Petr or Sergey,

Want to take these through the printk tree?

-- Steve

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> v2: used explicit type to be forced to (Steven)
>  lib/vsprintf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index 182a3e2e1629..c155769559ab 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
> @@ -1937,7 +1937,7 @@ char *flags_string(char *buf, char *end, void *flags_ptr,
>  		names = vmaflag_names;
>  		break;
>  	case 'g':
> -		flags = *(gfp_t *)flags_ptr;
> +		flags = (__force unsigned long)(*(gfp_t *)flags_ptr);
>  		names = gfpflag_names;
>  		break;
>  	default: