18dabf473e
Change the page member of the scatterlist structure to be an unsigned long, and encode more stuff in the lower bits: - Bits 0 and 1 zero: this is a normal sg entry. Next sg entry is located at sg + 1. - Bit 0 set: this is a chain entry, the next real entry is at ->page_link with the two low bits masked off. - Bit 1 set: this is the final entry in the sg entry. sg_next() will return NULL when passed such an entry. It's thus important that sg table users use the proper accessors to get and set the page member. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
23 lines
410 B
C
23 lines
410 B
C
#ifndef _ALPHA_SCATTERLIST_H
|
|
#define _ALPHA_SCATTERLIST_H
|
|
|
|
#include <asm/page.h>
|
|
#include <asm/types.h>
|
|
|
|
struct scatterlist {
|
|
unsigned long page_link;
|
|
unsigned int offset;
|
|
|
|
unsigned int length;
|
|
|
|
dma_addr_t dma_address;
|
|
__u32 dma_length;
|
|
};
|
|
|
|
#define sg_dma_address(sg) ((sg)->dma_address)
|
|
#define sg_dma_len(sg) ((sg)->dma_length)
|
|
|
|
#define ISA_DMA_THRESHOLD (~0UL)
|
|
|
|
#endif /* !(_ALPHA_SCATTERLIST_H) */
|