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Date: Tue, 26 Oct 2004 00:23:42 -0700
From: Andrew Morton <akpm@osdl.org>
To: Werner Almesberger <werner@almesberger.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] make buffer head argument of buffer_##name "const"
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Werner Almesberger <werner@almesberger.net> wrote:
>
> --- linux-2.6.9/include/linux/buffer_head.h.orig	Tue Oct 26 02:57:54 2004
>  +++ linux-2.6.9/include/linux/buffer_head.h	Tue Oct 26 02:21:04 2004
>  @@ -76,7 +76,7 @@
>   {									\
>   	clear_bit(BH_##bit, &(bh)->b_state);				\
>   }									\
>  -static inline int buffer_##name(struct buffer_head *bh)			\
>  +static inline int buffer_##name(const struct buffer_head *bh)		\
>   {									\
>   	return test_bit(BH_##bit, &(bh)->b_state);			\
>   }

OK, but why?  Does it generate better code or something?