linux-kernel - Re: [PATCH -mm] Introduce U16_MAX and U32

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Date:	Tue, 31 Jul 2007 11:57:29 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Satyam Sharma <satyam@...radead.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm] Introduce U16_MAX and U32_MAX

On Tue, 31 Jul 2007 21:56:12 +0530 (IST)
Satyam Sharma <satyam@...radead.org> wrote:

> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -30,6 +30,9 @@ extern const char linux_proc_banner[];
>  #define LLONG_MIN	(-LLONG_MAX - 1)
>  #define ULLONG_MAX	(~0ULL)
>  
> +#define U16_MAX		((u16) ~0U)
> +#define U32_MAX		((u32) ~0U)
> +

hm, I'd have thought that there's a risk of gcc warnings here, forcing
0xffffffff into a u16, but apparently not.

Still, I think it'd be tidier here to tell the truth and use plain
old 0xffff and 0xffffffff?
-
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