linux-kernel - Re: [PATCH] scripts/tags.sh: Add magic for OFFSET and DEFINE

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Date:	Tue, 26 Mar 2013 22:35:32 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	Kirill Tkhai <tkhai@...dex.ru>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] scripts/tags.sh: Add magic for OFFSET and DEFINE

On Sat, Mar 23, 2013 at 02:58:20PM +0400, Kirill Tkhai wrote:
> Add rules for definitions which is generally used in asm-offsets files.
> 
> Signed-off-by: Kirill V Tkhai <tkhai@...dex.ru>
> CC: Michal Marek <mmarek@...e.cz>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> ---
>  scripts/tags.sh |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> diff --git a/scripts/tags.sh b/scripts/tags.sh
> index 26a87e6..74f02e4 100755
> --- a/scripts/tags.sh
> +++ b/scripts/tags.sh
> @@ -199,7 +199,9 @@ exuberant()
>  	--regex-c='/DEFINE_PER_CPU_SHARED_ALIGNED\(([^,]*,\s*)(\w*).*\)/\2/v/' \
>  	--regex-c='/DECLARE_WAIT_QUEUE_HEAD\((\w*)/\1/v/'		\
>  	--regex-c='/DECLARE_(TASKLET|WORK|DELAYED_WORK)\((\w*)/\2/v/'	\
> -	--regex-c='/DEFINE_PCI_DEVICE_TABLE\((\w*)/\1/v/'
> +	--regex-c='/DEFINE_PCI_DEVICE_TABLE\((\w*)/\1/v/'		\
> +	--regex-c='/(^\s)OFFSET\((\w*)/\2/v/'				\
> +	--regex-c='/(^\s)DEFINE\((\w*)/\2/v/'

The macro definitions in the asm-offsets.h file are ammended with a
comment explaining what the value actually means. So you see both the
value and the semantic of the macro:

#define TI_flags 16 /* offsetof(struct thread_info, flags)      # */


By jumping to the asm-offset.c file instead, you would get only a subset
of that information.

OFFSET(TI_flags, thread_info, flags);

Unless I'm missing something, I don't think that this patch improves
much.

Michal
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