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>
21 lines
452 B
C
21 lines
452 B
C
#ifndef _M68K_SCATTERLIST_H
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#define _M68K_SCATTERLIST_H
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#include <linux/types.h>
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struct scatterlist {
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unsigned long page_link;
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unsigned int offset;
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unsigned int length;
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__u32 dma_address; /* A place to hang host-specific addresses at. */
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};
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/* This is bogus and should go away. */
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#define ISA_DMA_THRESHOLD (0x00ffffff)
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#define sg_dma_address(sg) ((sg)->dma_address)
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#define sg_dma_len(sg) ((sg)->length)
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#endif /* !(_M68K_SCATTERLIST_H) */
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