tree efd4cbbac280618e1cd6e9dd464730a739c2b37f
parent bbbc3c1cfaf6900d24e3c9fcaac25d267ad2bc40
author Bart Van Assche <bart.vanassche@wdc.com> 1515169606 -0800
committer Jens Axboe <axboe@kernel.dk> 1515255480 -0700

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>