linux-kernel - Re: [PATCH 2.6.31.1] include/linux/kmemcheck.h: fix a sparse warning

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Message-ID: <e2e108260910012341v5eab14c5o29da95ec52e75183@mail.gmail.com>
Date:	Fri, 2 Oct 2009 08:41:55 +0200
From:	Bart Van Assche <bart.vanassche@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Vegard Nossum <vegardno@....uio.no>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2.6.31.1] include/linux/kmemcheck.h: fix a sparse warning

On Sat, Sep 26, 2009 at 2:28 PM, Bart Van Assche
<bart.vanassche@...il.com> wrote:
>
> Checking a 2.6.31.1 kernel configured with allyesconfig/allmodconfig
> with sparse (make C=2) triggers a sparse warning on code that uses the
> kmemcheck_annotate_bitfield() macro. An example of such a warning:
>
> include/net/inet_sock.h:208:17: warning: do-while statement is not a compound statement
>
> Signed-off-by: Bart Van Assche <bart.vanassche@...il.com>
> Cc: Vegard Nossum <vegardno@....uio.no>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
>
> --- linux-2.6.31.1/include/linux/kmemcheck-orig.h       2009-09-26 13:53:44.000000000 +0200
> +++ linux-2.6.31.1/include/linux/kmemcheck.h    2009-09-26 13:53:56.000000000 +0200
> @@ -137,13 +137,13 @@ static inline void kmemcheck_mark_initia
>        int name##_end[0];
>
>  #define kmemcheck_annotate_bitfield(ptr, name)                         \
> -       do if (ptr) {                                                   \
> +       do { if (ptr) {                                                 \
>                int _n = (long) &((ptr)->name##_end)                    \
>                        - (long) &((ptr)->name##_begin);                \
>                BUILD_BUG_ON(_n < 0);                                   \
>                                                                        \
>                kmemcheck_mark_initialized(&((ptr)->name##_begin), _n); \
> -       } while (0)
> +       } } while (0)
>
>  #define kmemcheck_annotate_variable(var)                               \
>        do {                                                            \

(ping)

Did anyone already have the time to review the patch above ?

Bart.
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