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-rw-r--r--Documentation/sysrq.txt7
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/sysrq.txt b/Documentation/sysrq.txt
index cf42b820ff9d..d56a01775423 100644
--- a/Documentation/sysrq.txt
+++ b/Documentation/sysrq.txt
@@ -66,7 +66,8 @@ On all - write a character to /proc/sysrq-trigger. e.g.:
66'b' - Will immediately reboot the system without syncing or unmounting 66'b' - Will immediately reboot the system without syncing or unmounting
67 your disks. 67 your disks.
68 68
69'c' - Will perform a kexec reboot in order to take a crashdump. 69'c' - Will perform a system crash by a NULL pointer dereference.
70 A crashdump will be taken if configured.
70 71
71'd' - Shows all locks that are held. 72'd' - Shows all locks that are held.
72 73
@@ -141,8 +142,8 @@ useful when you want to exit a program that will not let you switch consoles.
141re'B'oot is good when you're unable to shut down. But you should also 'S'ync 142re'B'oot is good when you're unable to shut down. But you should also 'S'ync
142and 'U'mount first. 143and 'U'mount first.
143 144
144'C'rashdump can be used to manually trigger a crashdump when the system is hung. 145'C'rash can be used to manually trigger a crashdump when the system is hung.
145The kernel needs to have been built with CONFIG_KEXEC enabled. 146Note that this just triggers a crash if there is no dump mechanism available.
146 147
147'S'ync is great when your system is locked up, it allows you to sync your 148'S'ync is great when your system is locked up, it allows you to sync your
148disks and will certainly lessen the chance of data loss and fscking. Note 149disks and will certainly lessen the chance of data loss and fscking. Note