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| author | Paolo Bonzini <pbonzini@redhat.com> | 2020-09-11 13:12:11 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-09-11 13:12:11 -0400 |
| commit | 1b67fd086dd7be076f190dfe4b52403d0cf58375 (patch) | |
| tree | b7ea623c62bd8b1a1310c5e9d24dbf155a9d04aa /Documentation/watchdog/watchdog-kernel-api.rst | |
| parent | b5331379bc62611d1026173a09c73573384201d9 (diff) | |
| parent | 7b75cd5128421c673153efb1236705696a1a9812 (diff) | |
| download | linux-next-1b67fd086dd7be076f190dfe4b52403d0cf58375.tar.gz | |
Merge tag 'kvmarm-fixes-5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD
KVM/arm64 fixes for Linux 5.9, take #1
- Multiple stolen time fixes, with a new capability to match x86
- Fix for hugetlbfs mappings when PUD and PMD are the same level
- Fix for hugetlbfs mappings when PTE mappings are enforced
(dirty logging, for example)
- Fix tracing output of 64bit values
Diffstat (limited to 'Documentation/watchdog/watchdog-kernel-api.rst')
| -rw-r--r-- | Documentation/watchdog/watchdog-kernel-api.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/watchdog/watchdog-kernel-api.rst b/Documentation/watchdog/watchdog-kernel-api.rst index 068a55ee0d4a..baf44e986b07 100644 --- a/Documentation/watchdog/watchdog-kernel-api.rst +++ b/Documentation/watchdog/watchdog-kernel-api.rst @@ -336,3 +336,15 @@ an action is taken by a preconfigured pretimeout governor preassigned to the watchdog device. If watchdog pretimeout governor framework is not enabled, watchdog_notify_pretimeout() prints a notification message to the kernel log buffer. + +To set the last known HW keepalive time for a watchdog, the following function +should be used:: + + int watchdog_set_last_hw_keepalive(struct watchdog_device *wdd, + unsigned int last_ping_ms) + +This function must be called immediately after watchdog registration. It +sets the last known hardware heartbeat to have happened last_ping_ms before +current time. Calling this is only needed if the watchdog is already running +when probe is called, and the watchdog can only be pinged after the +min_hw_heartbeat_ms time has passed from the last ping. |