Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
crypto: scatterwalk - Add memcpy_sglist
Add memcpy_sglist which copies one SG list to another.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
+30
+27
crypto/scatterwalk.c
+27
crypto/scatterwalk.c
···
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}
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EXPORT_SYMBOL_GPL(memcpy_to_sglist);
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void memcpy_sglist(struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct scatter_walk swalk;
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struct scatter_walk dwalk;
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if (unlikely(nbytes == 0)) /* in case sg == NULL */
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return;
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scatterwalk_start(&swalk, src);
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scatterwalk_start(&dwalk, dst);
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do {
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unsigned int slen, dlen;
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unsigned int len;
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slen = scatterwalk_next(&swalk, nbytes);
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dlen = scatterwalk_next(&dwalk, nbytes);
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len = min(slen, dlen);
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memcpy(dwalk.addr, swalk.addr, len);
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scatterwalk_done_dst(&dwalk, len);
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scatterwalk_done_src(&swalk, len);
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nbytes -= len;
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} while (nbytes);
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}
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EXPORT_SYMBOL_GPL(memcpy_sglist);
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+
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struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2],
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struct scatterlist *src,
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unsigned int len)
+3
include/crypto/scatterwalk.h
+3
include/crypto/scatterwalk.h
···
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void memcpy_to_sglist(struct scatterlist *sg, unsigned int start,
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const void *buf, unsigned int nbytes);
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void memcpy_sglist(struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes);
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/* In new code, please use memcpy_{from,to}_sglist() directly instead. */
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static inline void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
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unsigned int start,