[SCSI] usb-storage: add support for write cache quirk

[platform/adaptation/renesas_rcar/renesas_kernel.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index c45513d..c68634e 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2543,6 +2543,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        sched_debug     [KNL] Enables verbose scheduler debug messages.
 
+       skew_tick=      [KNL] Offset the periodic timer tick per cpu to mitigate
+                       xtime_lock contention on larger systems, and/or RCU lock
+                       contention on all systems with CONFIG_MAXSMP set.
+                       Format: { "0" | "1" }
+                       0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
+                       1 -- enable.
+                       Note: increases power consumption, thus should only be
+                       enabled if running jitter sensitive (HPC/RT) workloads.
+
        security=       [SECURITY] Choose a security module to enable at boot.
                        If this boot parameter is not specified, only the first
                        security module asking for security registration will be
@@ -2923,6 +2932,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                                        initial READ(10) command);
                                o = CAPACITY_OK (accept the capacity
                                        reported by the device);
+                               p = WRITE_CACHE (the device cache is ON
+                                       by default);
                                r = IGNORE_RESIDUE (the device reports
                                        bogus residue values);
                                s = SINGLE_LUN (the device has only one