diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-kernel-livepatch | 12 | ||||
| -rw-r--r-- | Documentation/livepatch/livepatch.txt | 11 |
2 files changed, 21 insertions, 2 deletions
diff --git a/Documentation/ABI/testing/sysfs-kernel-livepatch b/Documentation/ABI/testing/sysfs-kernel-livepatch index d5d39748382f..3bb9d5bc1ce3 100644 --- a/Documentation/ABI/testing/sysfs-kernel-livepatch +++ b/Documentation/ABI/testing/sysfs-kernel-livepatch @@ -33,6 +33,18 @@ Description: An attribute which indicates whether the patch is currently in transition. +What: /sys/kernel/livepatch/<patch>/signal +Date: Nov 2017 +KernelVersion: 4.15.0 +Contact: live-patching@vger.kernel.org +Description: + A writable attribute that allows administrator to affect the + course of an existing transition. Writing 1 sends a fake + signal to all remaining blocking tasks. The fake signal + means that no proper signal is delivered (there is no data in + signal pending structures). Tasks are interrupted or woken up, + and forced to change their patched state. + What: /sys/kernel/livepatch/<patch>/<object> Date: Nov 2014 KernelVersion: 3.19.0 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. |