blktrace: fix coding style in recent patches

[linux-2.6-omap-h63xx.git] / block / Kconfig

diff --git a/block/Kconfig b/block/Kconfig
index 290b219fad9c5a1b825d495c8ea427bda7b04c5c..7cdaa1d722528372591377c60e3695e3ec9d0b16 100644 (file)
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -24,21 +24,23 @@ menuconfig BLOCK
 if BLOCK
 
 config LBD
-       bool "Support for Large Block Devices"
+       bool "Support for large block devices and files"
        depends on !64BIT
        help
-         Enable block devices of size 2TB and larger.
+         Enable block devices or files of size 2TB and larger.
 
          This option is required to support the full capacity of large
          (2TB+) block devices, including RAID, disk, Network Block Device,
          Logical Volume Manager (LVM) and loopback.
+       
+         This option also enables support for single files larger than
+         2TB.
 
-         For example, RAID devices are frequently bigger than the capacity
-         of the largest individual hard drive.
-
-         This option is not required if you have individual disk drives
-         which total 2TB+ and you are not aggregating the capacity into
-         a large block device (e.g. using RAID or LVM).
+         The ext4 filesystem requires that this feature be enabled in
+         order to support filesystems that have the huge_file feature
+         enabled.    Otherwise, it will refuse to mount any filesystems
+         that use the huge_file feature, which is enabled by default
+         by mke2fs.ext4.   The GFS2 filesystem also requires this feature.
 
          If unsure, say N.
 
@@ -48,6 +50,8 @@ config BLK_DEV_IO_TRACE
        select RELAY
        select DEBUG_FS
        select TRACEPOINTS
+       select TRACING
+       select STACKTRACE
        help
          Say Y here if you want to be able to trace the block layer actions
          on a given queue. Tracing allows you to see any traffic happening
@@ -56,16 +60,13 @@ config BLK_DEV_IO_TRACE
 
          git://git.kernel.dk/blktrace.git
 
-         If unsure, say N.
+         Tracing also is possible using the ftrace interface, e.g.:
 
-config LSF
-       bool "Support for Large Single Files"
-       depends on !64BIT
-       help
-         Say Y here if you want to be able to handle very large files (2TB
-         and larger), otherwise say N.
+           echo 1 > /sys/block/sda/sda1/trace/enable
+           echo blk > /sys/kernel/debug/tracing/current_tracer
+           cat /sys/kernel/debug/tracing/trace_pipe
 
-         If unsure, say Y.
+         If unsure, say N.
 
 config BLK_DEV_BSG
        bool "Block layer SG support v4 (EXPERIMENTAL)"