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-rw-r--r--block/Kconfig20
-rw-r--r--block/Kconfig.iosched3
-rw-r--r--block/Makefile2
3 files changed, 24 insertions, 1 deletions
diff --git a/block/Kconfig b/block/Kconfig
index b6f5f0a7965..9af6c614dfd 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -1,6 +1,24 @@
#
# Block layer core configuration
#
+config BLOCK
+ bool "Enable the block layer"
+ default y
+ help
+ This permits the block layer to be removed from the kernel if it's not
+ needed (on some embedded devices for example). If this option is
+ disabled, then blockdev files will become unusable and some
+ filesystems (such as ext3) will become unavailable.
+
+ This option will also disable SCSI character devices and USB storage
+ since they make use of various block layer definitions and
+ facilities.
+
+ Say Y here unless you know you really don't want to mount disks and
+ suchlike.
+
+if BLOCK
+
#XXX - it makes sense to enable this only for 32-bit subarch's, not for x86_64
#for instance.
config LBD
@@ -33,4 +51,6 @@ config LSF
If unsure, say Y.
+endif
+
source block/Kconfig.iosched
diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index 48d090e266f..903f0d3b685 100644
--- a/block/Kconfig.iosched
+++ b/block/Kconfig.iosched
@@ -1,3 +1,4 @@
+if BLOCK
menu "IO Schedulers"
@@ -67,3 +68,5 @@ config DEFAULT_IOSCHED
default "noop" if DEFAULT_NOOP
endmenu
+
+endif
diff --git a/block/Makefile b/block/Makefile
index c05de0e0037..4b84d0d5947 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -2,7 +2,7 @@
# Makefile for the kernel block layer
#
-obj-y := elevator.o ll_rw_blk.o ioctl.o genhd.o scsi_ioctl.o
+obj-$(CONFIG_BLOCK) := elevator.o ll_rw_blk.o ioctl.o genhd.o scsi_ioctl.o
obj-$(CONFIG_IOSCHED_NOOP) += noop-iosched.o
obj-$(CONFIG_IOSCHED_AS) += as-iosched.o