Eric Lee / smarc-ti-linux-kernel

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Commit e8b5cbb041130ef297c90f8af2d3d45dfb9e6d15

Authored by Ben Hutchings
Committed by Greg Kroah-Hartman
1 parent 190c6cc328
Exists in master and in 16 other branches dlt-processor-sdk-linux-03.00.00.04, processor-sdk-linux-01.00.00, processor-sdk-linux-02.00.01, smarc-ti-linux-3.14.y, smarc-ti-linux-3.15.y, smarc-ti-lsk-linux-4.1.y, smarct3x-processor-sdk-04.01.00.06, smarct3x-processor-sdk-linux-02.00.01, smarct3x-processor-sdk-linux-03.00.00.04, smarct4x-800-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-04.01.00.06, smarct4x-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-linux-03.00.00.04, ti-linux-3.14.y, ti-linux-3.15.y, ti-lsk-linux-4.1.y

sysrq: Document hexadecimal values for kernel.sysrq bitmask 

It makes more sense to enter a bitmask in hexadecimal rather than
decimal.  Sadly we can't make it read back as hexadecimal.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Showing 1 changed file with 11 additions and 8 deletions Side-by-side Diff

Documentation/sysrq.txt
Diff comments   View file @ e8b5cbb
... ... @@ -20,17 +20,20 @@
20 20 1 - enable all functions of sysrq
21 21 >1 - bitmask of allowed sysrq functions (see below for detailed function
22 22 description):
23   - 2 - enable control of console logging level
24   - 4 - enable control of keyboard (SAK, unraw)
25   - 8 - enable debugging dumps of processes etc.
26   - 16 - enable sync command
27   - 32 - enable remount read-only
28   - 64 - enable signalling of processes (term, kill, oom-kill)
29   - 128 - allow reboot/poweroff
30   - 256 - allow nicing of all RT tasks
  23 + 2 = 0x2 - enable control of console logging level
  24 + 4 = 0x4 - enable control of keyboard (SAK, unraw)
  25 + 8 = 0x8 - enable debugging dumps of processes etc.
  26 + 16 = 0x10 - enable sync command
  27 + 32 = 0x20 - enable remount read-only
  28 + 64 = 0x40 - enable signalling of processes (term, kill, oom-kill)
  29 + 128 = 0x80 - allow reboot/poweroff
  30 + 256 = 0x100 - allow nicing of all RT tasks
31 31  
32 32 You can set the value in the file by the following command:
33 33 echo "number" >/proc/sys/kernel/sysrq
  34 +
  35 +The number may be written either as decimal or as hexadecimal with the
  36 +0x prefix.
34 37  
35 38 Note that the value of /proc/sys/kernel/sysrq influences only the invocation
36 39 via a keyboard. Invocation of any operation via /proc/sysrq-trigger is always