linux-kernel - Re: [PATCH 1/1] unify DMA_..BIT

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Message-Id: <20071005140050.655b7727.akpm@linux-foundation.org>
Date:	Fri, 5 Oct 2007 14:00:50 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	bbpetkov@...oo.de, linux-kernel@...r.kernel.org, muli@...ibm.com,
	satyam@...radead.org, amitkale@...xen.com,
	achim_leubner@...ptec.com
Subject: Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1

On Fri, 05 Oct 2007 13:43:54 -0700
Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Andrew Morton wrote:
> > From: Andrew Morton <akpm@...ux-foundation.org>
> >
> > Now that we have DMA_BIT_MASK(), these macros are pointless.
> >   
> 
> Except, unfortunately, DMA_64BIT_MASK.  I guess we could special case
> it, assuming this works in all the contexts the macro is used in (ie,
> compile-time constant?):
> 
> #define DMA_BIT_MASK(n)	(((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
> 

doh.  Thanks.

--- a/include/linux/dma-mapping.h~stop-using-dma_xxbit_mask-fix
+++ a/include/linux/dma-mapping.h
@@ -13,7 +13,7 @@ enum dma_data_direction {
 	DMA_NONE = 3,
 };
 
-#define DMA_BIT_MASK(n)	((1ULL<<(n))-1)
+#define DMA_BIT_MASK(n)	(((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
 
 /*
  * NOTE: do not use the below macros in new code and do not add new definitions
@@ -21,7 +21,7 @@ enum dma_data_direction {
  *
  * Instead, just open-code DMA_BIT_MASK(n) within your driver
  */
-#define DMA_64BIT_MASK	(~0ULL)
+#define DMA_64BIT_MASK	DMA_BIT_MASK(64)
 #define DMA_48BIT_MASK	DMA_BIT_MASK(48)
 #define DMA_47BIT_MASK	DMA_BIT_MASK(47)
 #define DMA_40BIT_MASK	DMA_BIT_MASK(40)
_


it's irksome that there doesn't seem to be a neater way of doing
this, until they give us unsigned long long longs.
-
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