forked from luck/tmp_suning_uos_patched
d6ec084200
Add a Kconfig entry which will toggle some sanity checks on the sg entry and tables. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
39 lines
985 B
C
39 lines
985 B
C
#ifndef _ASM_IA64_SCATTERLIST_H
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#define _ASM_IA64_SCATTERLIST_H
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/*
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* Modified 1998-1999, 2001-2002, 2004
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* David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
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*/
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#include <asm/types.h>
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struct scatterlist {
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#ifdef CONFIG_DEBUG_SG
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unsigned long sg_magic;
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#endif
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unsigned long page_link;
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unsigned int offset;
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unsigned int length; /* buffer length */
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dma_addr_t dma_address;
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unsigned int dma_length;
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};
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/*
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* It used to be that ISA_DMA_THRESHOLD had something to do with the
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* DMA-limits of ISA-devices. Nowadays, its only remaining use (apart
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* from the aha1542.c driver, which isn't 64-bit clean anyhow) is to
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* tell the block-layer (via BLK_BOUNCE_ISA) what the max. physical
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* address of a page is that is allocated with GFP_DMA. On IA-64,
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* that's 4GB - 1.
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*/
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#define ISA_DMA_THRESHOLD 0xffffffff
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#define sg_dma_len(sg) ((sg)->dma_length)
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#define sg_dma_address(sg) ((sg)->dma_address)
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#define ARCH_HAS_SG_CHAIN
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#endif /* _ASM_IA64_SCATTERLIST_H */
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