arm64: dts: rockchip: add cpuinfo support for rk3399-android

[firefly-linux-kernel-4.4.55.git] / Documentation / device-mapper / dm-crypt.txt

diff --git a/Documentation/device-mapper/dm-crypt.txt b/Documentation/device-mapper/dm-crypt.txt
index 571f24ffc91c42a8a175688fa70dacce7c1643f9..692171fe9da0307732b96327e10848e1d12e2e26 100644 (file)
--- a/Documentation/device-mapper/dm-crypt.txt
+++ b/Documentation/device-mapper/dm-crypt.txt
@@ -5,7 +5,7 @@ Device-Mapper's "crypt" target provides transparent encryption of block devices
 using the kernel crypto API.
 
 For a more detailed description of supported parameters see:
-http://code.google.com/p/cryptsetup/wiki/DMCrypt
+https://gitlab.com/cryptsetup/cryptsetup/wikis/DMCrypt
 
 Parameters: <cipher> <key> <iv_offset> <device path> \
              <offset> [<#opt_params> <opt_params>]
@@ -51,7 +51,7 @@ Parameters: <cipher> <key> <iv_offset> <device path> \
     Otherwise #opt_params is the number of following arguments.
 
     Example of optional parameters section:
-        2 allow_discards same_cpu_crypt
+        3 allow_discards same_cpu_crypt submit_from_crypt_cpus
 
 allow_discards
     Block discard requests (a.k.a. TRIM) are passed through the crypt device.
@@ -68,11 +68,19 @@ same_cpu_crypt
     The default is to use an unbound workqueue so that encryption work
     is automatically balanced between available CPUs.
 
+submit_from_crypt_cpus
+    Disable offloading writes to a separate thread after encryption.
+    There are some situations where offloading write bios from the
+    encryption threads to a single thread degrades performance
+    significantly.  The default is to offload write bios to the same
+    thread because it benefits CFQ to have writes submitted using the
+    same context.
+
 Example scripts
 ===============
 LUKS (Linux Unified Key Setup) is now the preferred way to set up disk
 encryption with dm-crypt using the 'cryptsetup' utility, see
-http://code.google.com/p/cryptsetup/
+https://gitlab.com/cryptsetup/cryptsetup
 
 [[
 #!/bin/sh