linux-kernel - Re: [PATCH-ugly] kmemtrace: casting a gfp_t requires _

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Message-ID: <20081107230629.GC5210@localhost>
Date:	Sat, 8 Nov 2008 01:06:29 +0200
From:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
To:	Harvey Harrison <harvey.harrison@...il.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH-ugly] kmemtrace: casting a gfp_t requires __force

On Fri, Nov 07, 2008 at 10:58:41AM -0800, Harvey Harrison wrote:
> gfp_t is a bitwise type, casting to unsigned long produces a
> warning.  Suppress it with __force.
> 
> Otherwise sparse complains thusly:
> include/linux/kmemtrace.h:33:2: warning: cast from restricted gfp_t
> 
> Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
> ---
> Eduard, this is a local patch I've had sitting around in my sparse testing
> tree.  I'm really not sure what the appropriate format specifier is for a
> gfp_t, but I don't think the trace infrastructure has support for it
> anyway...so if you are going to keep casting to unsigned long you'll need
> this...perhaps with a comment why added.
> 
>  include/linux/kmemtrace.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/include/linux/kmemtrace.h b/include/linux/kmemtrace.h
> index 5bea8ea..9d82085 100644
> --- a/include/linux/kmemtrace.h
> +++ b/include/linux/kmemtrace.h
> @@ -34,7 +34,7 @@ static inline void kmemtrace_mark_alloc_node(enum kmemtrace_type_id type_id,
>  		   "bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d",
>  		   type_id, call_site, (unsigned long) ptr,
>  		   (unsigned long) bytes_req, (unsigned long) bytes_alloc,
> -		   (unsigned long) gfp_flags, node);
> +		   (__force unsigned long)gfp_flags, node);
>  }
>  
>  static inline void kmemtrace_mark_free(enum kmemtrace_type_id type_id,
> -- 
> 1.6.0.3.756.gb776d
> 
>

Sorry, the commit name is okay, my mistake.

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