From: Stephen Hemminger <shemminger@linux-foundation.org>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Subject: [RFC 2/2] shrink size of scatterlist on common i386/x86-64
Date: Thu, 05 Jul 2007 16:14:14 -0700 [thread overview]
Message-ID: <20070705231615.451797310@linux-foundation.org> (raw)
In-Reply-To: 20070705231412.021359760@linux-foundation.org
[-- Attachment #1: scatterlist-shrink.patch --]
[-- Type: text/plain, Size: 1032 bytes --]
The scatterlist only needs 16 bits for length/offset because
PAGE_SIZE is 4K
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
--- a/include/asm-i386/scatterlist.h 2007-07-05 14:37:11.000000000 -0700
+++ b/include/asm-i386/scatterlist.h 2007-07-05 15:44:51.000000000 -0700
@@ -5,9 +5,9 @@
struct scatterlist {
struct page *page;
- unsigned int offset;
dma_addr_t dma_address;
- unsigned int length;
+ u16 offset;
+ u16 length;
};
/* These macros should be used after a pci_map_sg call has been done
--- a/include/asm-x86_64/scatterlist.h 2007-07-05 14:37:11.000000000 -0700
+++ b/include/asm-x86_64/scatterlist.h 2007-07-05 15:46:49.000000000 -0700
@@ -5,10 +5,10 @@
struct scatterlist {
struct page *page;
- unsigned int offset;
- unsigned int length;
dma_addr_t dma_address;
unsigned int dma_length;
+ u16 offset;
+ u16 length;
};
#define ISA_DMA_THRESHOLD (0x00ffffff)
--
Stephen Hemminger <shemminger@linux-foundation.org>
next prev parent reply other threads:[~2007-07-05 23:17 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-05 23:14 [RFC 0/2] Convert skb to use scatterlist Stephen Hemminger
2007-07-05 23:14 ` [RFC 1/2] skbuff: " Stephen Hemminger
2007-07-05 23:14 ` Stephen Hemminger [this message]
2007-07-05 23:32 ` [RFC 2/2] shrink size of scatterlist on common i386/x86-64 Roland Dreier
2007-07-05 23:43 ` David Miller
2007-07-06 0:00 ` Stephen Hemminger
2007-07-06 0:15 ` David Miller
2007-07-06 7:43 ` Rusty Russell
2007-07-06 8:54 ` David Miller
2007-07-06 17:14 ` Williams, Mitch A
2007-07-06 19:20 ` David Miller
2007-07-08 16:17 ` Muli Ben-Yehuda
2007-07-09 7:06 ` David Miller
2007-07-09 8:53 ` Muli Ben-Yehuda
2007-07-08 16:11 ` Muli Ben-Yehuda
2007-07-11 23:46 ` Williams, Mitch A
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