linux-kernel - Re: [PATCH] introduce lower_32

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Date:	Mon, 28 Jul 2008 12:59:00 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] introduce lower_32_bits() macro

On Fri, Jul 25, 2008 at 12:06:27PM -0400, H. Peter Anvin wrote:
> Joerg Roedel wrote:
> >The file kernel.h contains the upper_32_bits macro. This patch adds the other
> >part, the lower_32_bits macro. Its first use will be in the driver for AMD
> >IOMMU.
> >Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> >---
> > include/linux/kernel.h |    6 ++++++
> > 1 files changed, 6 insertions(+), 0 deletions(-)
> >diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> >index f9cd7a5..6fd2977 100644
> >--- a/include/linux/kernel.h
> >+++ b/include/linux/kernel.h
> >@@ -73,6 +73,12 @@ extern const char linux_proc_banner[];
> >  */
> > #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
> > +/**
> >+ * lower_32_bits - return bits 0-31 of a number
> >+ * @n: the number we're accessing
> >+ */
> >+#define lower_32_bits(n) ((n) & 0xffffffffULL)
> >+
> 
> NAK.  These are assymmetric with regards to type, which is the *last*
> thing we want.
> 
> The symmetric definition would be ((u32)(n)), but that's already
> idiomatic use, so why not use it as-is?

Ok, true. Sorry for the broken patch. I will send an updated one.

Joerg

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