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authorBart Van Assche <bart.vanassche@wdc.com>2018-01-05 08:26:46 -0800
committerJens Axboe <axboe@kernel.dk>2018-01-06 09:18:00 -0700
commite80a0af4759a164214f02da157a3800753ce135f (patch)
treeefd4cbbac280618e1cd6e9dd464730a739c2b37f /lib/Kconfig
parentbbbc3c1cfaf6900d24e3c9fcaac25d267ad2bc40 (diff)
downloadlwn-e80a0af4759a164214f02da157a3800753ce135f.tar.gz
lwn-e80a0af4759a164214f02da157a3800753ce135f.zip
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 'lib/Kconfig')
-rw-r--r--lib/Kconfig4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index c5e84fbcb30b..4dd5c11366f9 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -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)