forked from Minki/linux
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
498 B
C
21 lines
498 B
C
#ifndef __ASM_CRIS_SCATTERLIST_H
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#define __ASM_CRIS_SCATTERLIST_H
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struct scatterlist {
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char * address; /* Location data is to be transferred to */
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unsigned int length;
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/* The following is i386 highmem junk - not used by us */
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unsigned long page_link;
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unsigned int offset;/* for highmem, page offset */
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};
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#define sg_dma_address(sg) ((sg)->address)
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#define sg_dma_len(sg) ((sg)->length)
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/* i386 junk */
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#define ISA_DMA_THRESHOLD (0x1fffffff)
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#endif /* !(__ASM_CRIS_SCATTERLIST_H) */
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