X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=drivers%2Fmd%2FKconfig;h=3d237a03dab3dbd2ead85526a76e8ddcf9271f2d;hb=c336f64cf9a9c1bbeb0027f26c94ecfb29367ee1;hp=6035794bc1f208809aa0175685a3a15f58fc2c7d;hpb=eed022ee2f71ef37b65442f3f430a3c1822169b2;p=firefly-linux-kernel-4.4.55.git

diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 6035794bc1f2..3d237a03dab3 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -458,6 +458,21 @@ config DM_VERITY
 
 	  If unsure, say N.
 
+config DM_VERITY_HASH_PREFETCH_MIN_SIZE_128
+	bool "Prefetch size 128"
+
+config DM_VERITY_HASH_PREFETCH_MIN_SIZE
+	int "Verity hash prefetch minimum size"
+	depends on DM_VERITY
+	range 1 4096
+	default 128 if DM_VERITY_HASH_PREFETCH_MIN_SIZE_128
+	default 1
+	---help---
+	  This sets minimum number of hash blocks to prefetch for dm-verity.
+	  For devices like eMMC, having larger prefetch size like 128 can improve
+	  performance with increased memory consumption for keeping more hashes
+	  in RAM.
+
 config DM_VERITY_FEC
 	bool "Verity forward error correction support"
 	depends on DM_VERITY
@@ -510,6 +525,7 @@ config DM_ANDROID_VERITY
 	depends on ASYMMETRIC_KEY_TYPE
 	depends on ASYMMETRIC_PUBLIC_KEY_SUBTYPE
 	depends on MD_LINEAR
+	select DM_VERITY_HASH_PREFETCH_MIN_SIZE_128
 	---help---
 	  This device-mapper target is virtually a VERITY target. This
 	  target is setup by reading the metadata contents piggybacked