linux-kernel - Re: [Trivial Patch] Remove JFFS2 dependency on internal Zlib header

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Date:	Sun, 03 Jun 2007 08:21:13 +0800
From:	Prakash Punnoor <prakash@...noor.de>
To:	Daniel Hazelton <dhazelton@...er.net>
CC:	dwmw2@...radead.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Trivial Patch] Remove JFFS2 dependency on internal Zlib header

Daniel Hazelton wrote:
> 
> Signed-off-by: Daniel Hazelton <dhazelton@...er.net>
> 
> DRH
> 
> diff --git a/fs/jffs2/compr_zlib.c b/fs/jffs2/compr_zlib.c
> index 2b87fcc..9f1b935 100644
> --- a/fs/jffs2/compr_zlib.c
> +++ b/fs/jffs2/compr_zlib.c
> @@ -16,7 +16,6 @@
>  #include <linux/kernel.h>
>  #include <linux/slab.h>
>  #include <linux/zlib.h>
> -#include <linux/zutil.h>
>  #include "nodelist.h"
>  #include "compr.h"
> 
> @@ -154,7 +153,7 @@ static int jffs2_zlib_decompress(unsigned char *data_in,
> 
>         /* If it's deflate, and it's got no preset dictionary, then
>            we can tell zlib to skip the adler32 check. */
> -       if (srclen > 2 && !(data_in[1] & PRESET_DICT) &&
> +       if (srclen > 2 && !(data_in[1] & 0x20) &&
>             ((data_in[0] & 0x0f) == Z_DEFLATED) &&
>             !(((data_in[0]<<8) + data_in[1]) % 31)) {
> 


Why not

#define PRESET_DICT 0x20

instead of obfuscating the code with a magic number ? (Or name it 
differently if it clashes with something else...)


Cheers,

Prakash
-
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