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author | Ulrich Obergfell <uobergfe@redhat.com> | 2014-08-11 14:49:25 (GMT) |
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committer | Ingo Molnar <mingo@kernel.org> | 2014-08-18 09:17:46 (GMT) |
commit | df577149594cefacd62740e86de080c6336d699e (patch) | |
tree | 22dfb420cec7d57497ab875487e021bc5bd33794 /samples/kprobes | |
parent | f530504a063cfa028971e4b26ea8e0c32908de25 (diff) | |
download | linux-df577149594cefacd62740e86de080c6336d699e.tar.xz |
watchdog: Fix print-once on enable
This patch avoids printing the message 'enabled on all CPUs,
...' multiple times. For example, the issue can occur in the
following scenario:
1) watchdog_nmi_enable() fails to enable PMU counters and sets
cpu0_err.
2) 'echo [0|1] > /proc/sys/kernel/nmi_watchdog' is executed to
disable and re-enable the watchdog mechanism 'on the fly'.
3) If watchdog_nmi_enable() succeeds to enable PMU counters,
each CPU will print the message because step1 left behind a
non-zero cpu0_err.
if (!IS_ERR(event)) {
if (cpu == 0 || cpu0_err)
pr_info("enabled on all CPUs, ...")
The patch avoids this by clearing cpu0_err in watchdog_nmi_disable().
Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: pbonzini@redhat.com
Link: http://lkml.kernel.org/r/1407768567-171794-4-git-send-email-dzickus@redhat.com
[ Applied small cleanups. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'samples/kprobes')
0 files changed, 0 insertions, 0 deletions