linux-kernel - Re: [PATCH 2/2] Use <asm-generic/bitops/le.h> in <asm-powerpc/bitops.h>

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Date:	Sun, 1 Jun 2008 00:52:57 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Ben Hutchings" <bhutchings@...arflare.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Use <asm-generic/bitops/le.h> in <asm-powerpc/bitops.h>

Hi,

On Sun, Jun 1, 2008 at 12:38 AM, Ben Hutchings
<bhutchings@...arflare.com> wrote:
> The powerpc little-endian bitops have no arch-specific optimisations.
>
> Remove clashing macros from these headers.
>
> Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
> ---
>  include/asm-generic/bitops/le.h |    1 -
>  include/asm-powerpc/bitops.h    |   34 +---------------------------------
>  2 files changed, 1 insertions(+), 34 deletions(-)
>
> diff --git a/include/asm-generic/bitops/le.h b/include/asm-generic/bitops/le.h
> index a51c4ca..08c5df3 100644
> --- a/include/asm-generic/bitops/le.h
> +++ b/include/asm-generic/bitops/le.h
> @@ -4,7 +4,6 @@
>  #include <asm/types.h>
>  #include <asm/byteorder.h>
>
> -#define BITOP_WORD(nr)         ((nr) / BITS_PER_LONG)
>  #define BITOP_LE_SWIZZLE       ((BITS_PER_LONG-1) & ~0x7)
>
>  #if defined(__LITTLE_ENDIAN)
> diff --git a/include/asm-powerpc/bitops.h b/include/asm-powerpc/bitops.h
> index dcbf9a8..afe2fa3 100644
> --- a/include/asm-powerpc/bitops.h
> +++ b/include/asm-powerpc/bitops.h
> @@ -54,7 +54,6 @@
>
>  #define BITOP_MASK(nr)         (1UL << ((nr) % BITS_PER_LONG))
>  #define BITOP_WORD(nr)         ((nr) / BITS_PER_LONG)
> -#define BITOP_LE_SWIZZLE       ((BITS_PER_LONG-1) & ~0x7)
>
>  static __inline__ void set_bit(int nr, volatile unsigned long *addr)
>  {
> @@ -340,39 +339,8 @@ static __inline__ int fls64(__u64 x)
>
>  /* Little-endian versions */
>
> -static __inline__ int test_le_bit(unsigned long nr,
> -                                 __const__ unsigned long *addr)
> -{
> -       __const__ unsigned char *tmp = (__const__ unsigned char *) addr;
> -       return (tmp[nr >> 3] >> (nr & 7)) & 1;
> -}
> +#include <asm-generic/bitops/le.h>

Is it completely impossible to move this #include to the top of the file?

I know that a lot of the current headers don't do this, and I don't
think it's a written rule with the kernel sources, BUT it's a nice
convention IMHO, and makes headers generally more maintainable. What
do you think?


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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