linux-kernel - Re: [patch 2/9] Store max number of objects in the page struct.

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Message-Id: <20080321152407.b0fbe81f.akpm@linux-foundation.org>
Date:	Fri, 21 Mar 2008 15:24:07 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	clameter@....com, linux-kernel@...r.kernel.org,
	penberg@...helsinki.fi, mel@....ul.ie, mpm@...enic.com,
	linux-mm@...ck.org
Subject: Re: [patch 2/9] Store max number of objects in the page struct.

On Thu, 20 Mar 2008 11:32:17 +0800
"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> wrote:

> Add definitions of USHRT_MAX and others into kernel. ipc uses it and
> slub implementation might also use it.
> 
> The patch is against 2.6.25-rc6.
> 
> Signed-off-by: Zhang Yanmin <yanmin.zhang@...el.com>
> 
> ---
> 
> --- linux-2.6.25-rc6/include/linux/kernel.h	2008-03-20 04:25:46.000000000 +0800
> +++ linux-2.6.25-rc6_work/include/linux/kernel.h	2008-03-20 04:17:45.000000000 +0800
> @@ -20,6 +20,9 @@
>  extern const char linux_banner[];
>  extern const char linux_proc_banner[];
>  
> +#define USHRT_MAX	((u16)(~0U))
> +#define SHRT_MAX	((s16)(USHRT_MAX>>1))
> +#define SHRT_MIN	(-SHRT_MAX - 1)

We have UINT_MAX and ULONG_MAX and ULLONG_MAX.  If these were actually
UNT_MAX, ULNG_MAX and ULLNG_MAX then USHRT_MAX would make sense.

But they aren't, so it doesn't ;)

Please, let's call them USHORT_MAX, SHORT_MAX and SHORT_MIN.

> --- linux-2.6.25-rc6/ipc/util.h	2008-03-20 04:25:46.000000000 +0800
> +++ linux-2.6.25-rc6_work/ipc/util.h	2008-03-20 04:22:07.000000000 +0800
> @@ -12,7 +12,6 @@
>  
>  #include <linux/err.h>
>  
> -#define USHRT_MAX 0xffff
>  #define SEQ_MULTIPLIER	(IPCMNI)
>  
>  void sem_init (void);

And then convert IPC to use them?
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