linux-kernel - Re: [PATCH v3 2/2] kexec: Use min

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Date:	Tue, 26 Feb 2013 00:38:01 -0800
From:	Joe Perches <joe@...ches.com>
To:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Simon Horman <horms@...ge.net.au>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] kexec: Use min_t to simplify logic

On Tue, 2013-02-26 at 13:30 +0800, Zhang Yanfei wrote:
> This is just a tweak: using min_t to simplify logic of variable
> assignments.
> 
> v3:
> - cast type of (PAGE_SIZE - (maddr & ~PAGE_MASK)) into size_t.

Why?  Isn't this just a redundant cast?

> diff --git a/kernel/kexec.c b/kernel/kexec.c
[]
> @@ -822,13 +822,9 @@ static int kimage_load_normal_segment(struct kimage *image,
[]
> +		mchunk = min_t(size_t, mbytes,
> +			       (size_t)(PAGE_SIZE - (maddr & ~PAGE_MASK)));

#define min_t(type, x, y) ({			\
	type __min1 = (x);			\
	type __min2 = (y);			\
	__min1 < __min2 ? __min1: __min2; })


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