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author | Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> | 2018-03-30 03:20:59 +0300 |
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committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-03-30 23:50:15 +0300 |
commit | f385178679b6561d2e717567d12e07c7f927ee59 (patch) | |
tree | 97578ab32a6848feb7f29972f58753febe01d0ce /include/linux | |
parent | 1379ef828a18d8f81c526b25e4d5685caa2cfd65 (diff) | |
download | linux-f385178679b6561d2e717567d12e07c7f927ee59.tar.xz |
lib/scatterlist: add sg_init_marker() helper
sg_init_marker initializes sg_magic in the sg table and calls
sg_mark_end() on the last entry of the table. This can be useful to
avoid memset in sg_init_table() when scatterlist is already zeroed out
For example: when scatterlist is embedded inside other struct and that
container struct is zeroed out
Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'include/linux')
-rw-r--r-- | include/linux/scatterlist.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 22b2131bcdcd..aa5d4eb725f5 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -248,6 +248,24 @@ static inline void *sg_virt(struct scatterlist *sg) return page_address(sg_page(sg)) + sg->offset; } +/** + * sg_init_marker - Initialize markers in sg table + * @sgl: The SG table + * @nents: Number of entries in table + * + **/ +static inline void sg_init_marker(struct scatterlist *sgl, + unsigned int nents) +{ +#ifdef CONFIG_DEBUG_SG + unsigned int i; + + for (i = 0; i < nents; i++) + sgl[i].sg_magic = SG_MAGIC; +#endif + sg_mark_end(&sgl[nents - 1]); +} + int sg_nents(struct scatterlist *sg); int sg_nents_for_len(struct scatterlist *sg, u64 len); struct scatterlist *sg_next(struct scatterlist *); |