linux-kernel - Re: [PATCH] Avoid truncating to 'long' in ALIGN() macro

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Date:	Sun, 26 Nov 2006 12:11:29 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Andrew Morton <akpm@...l.org>
cc:	Roland Dreier <rdreier@...co.com>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, openib-general@...nib.org,
	tom@...ngridcomputing.com, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] Avoid truncating to 'long' in ALIGN() macro



On Sun, 26 Nov 2006, Andrew Morton wrote:
> 
> I'd be inclined to merge it for 2.6.19.  Is everyone OK with it?

I'd _much_ rather make it more readable while at it. Something like this 
instead, which has just _one_ "typeof" cast, and at least to me makes it a 
lot more obvious what is going on (aka "to align something, use a mask 
that is of the same type as the thing to be aligned..").

Maybe it's just me, but I prefer to separate out the actual "action" from 
the "type fluff" around it.

		Linus

---
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 24b6111..b9b5e4b 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -30,8 +30,10 @@ extern const char linux_banner[];
 
 #define STACK_MAGIC	0xdeadbeef
 
+#define ALIGN(x,a)		__ALIGN_MASK(x,(typeof(x))(a)-1)
+#define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))
+
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-#define ALIGN(x,a) (((x)+(a)-1UL)&~((a)-1UL))
 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
-
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