diff options
| author | Bart Van Assche <bart.vanassche@wdc.com> | 2018-01-05 19:26:46 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-01-06 19:18:00 +0300 |
| commit | e80a0af4759a164214f02da157a3800753ce135f (patch) | |
| tree | efd4cbbac280618e1cd6e9dd464730a739c2b37f /include/linux/scatterlist.h | |
| parent | bbbc3c1cfaf6900d24e3c9fcaac25d267ad2bc40 (diff) | |
| download | linux-e80a0af4759a164214f02da157a3800753ce135f.tar.xz | |
lib/scatterlist: Introduce sgl_alloc() and sgl_free()
Many kernel drivers contain code that allocates and frees both a
scatterlist and the pages that populate that scatterlist.
Introduce functions in lib/scatterlist.c that perform these tasks
instead of duplicating this functionality in multiple drivers.
Only include these functions in the build if CONFIG_SGL_ALLOC=y
to avoid that the kernel size increases if this functionality is
not used.
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/scatterlist.h')
| -rw-r--r-- | include/linux/scatterlist.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index b7c83254c566..b8a7c1d1dbe3 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -276,6 +276,16 @@ int sg_alloc_table_from_pages(struct sg_table *sgt, struct page **pages, unsigned int n_pages, unsigned int offset, unsigned long size, gfp_t gfp_mask); +#ifdef CONFIG_SGL_ALLOC +struct scatterlist *sgl_alloc_order(unsigned long long length, + unsigned int order, bool chainable, + gfp_t gfp, unsigned int *nent_p); +struct scatterlist *sgl_alloc(unsigned long long length, gfp_t gfp, + unsigned int *nent_p); +void sgl_free_order(struct scatterlist *sgl, int order); +void sgl_free(struct scatterlist *sgl); +#endif /* CONFIG_SGL_ALLOC */ + size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf, size_t buflen, off_t skip, bool to_buffer); |