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lib/scatterlist: Introduce sgl_alloc() and sgl_free()

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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 <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Bart Van Assche 2018-01-05 08:26:46 -08:00 • committed by Jens Axboe
commit e80a0af475
3 changed files with 119 additions and 0 deletions
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4
lib/Kconfig
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@ -409,6 +409,10 @@ config HAS_DMA
depends on !NO_DMA
default y
config SGL_ALLOC
bool
default n
config DMA_NOOP_OPS
bool
depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)