diff options
Diffstat (limited to 'Documentation/livepatch')
| -rw-r--r-- | Documentation/livepatch/livepatch.txt | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/Documentation/livepatch/livepatch.txt b/Documentation/livepatch/livepatch.txt index ecdb18104ab0..9bcdef277a36 100644 --- a/Documentation/livepatch/livepatch.txt +++ b/Documentation/livepatch/livepatch.txt @@ -176,8 +176,12 @@ If a patch is in transition, this file shows 0 to indicate the task is unpatched and 1 to indicate it's patched. Otherwise, if no patch is in transition, it shows -1. Any tasks which are blocking the transition can be signaled with SIGSTOP and SIGCONT to force them to change their -patched state. - +patched state. This may be harmful to the system though. +/sys/kernel/livepatch/<patch>/signal attribute provides a better alternative. +Writing 1 to the attribute sends a fake signal to all remaining blocking +tasks. No proper signal is actually delivered (there is no data in signal +pending structures). Tasks are interrupted or woken up, and forced to change +their patched state. 3.1 Adding consistency model support to new architectures --------------------------------------------------------- @@ -435,6 +439,9 @@ Information about the registered patches can be found under /sys/kernel/livepatch. The patches could be enabled and disabled by writing there. +/sys/kernel/livepatch/<patch>/signal attribute allows administrator to affect a +patching operation. + See Documentation/ABI/testing/sysfs-kernel-livepatch for more details. |