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authorUlrich Obergfell <uobergfe@redhat.com>2014-08-11 10:49:25 -0400
committerIngo Molnar <mingo@kernel.org>2014-08-18 11:17:46 +0200
commitdf577149594cefacd62740e86de080c6336d699e (patch)
tree22dfb420cec7d57497ab875487e021bc5bd33794 /fs/nfsd/nfs4recover.c
parentf530504a063cfa028971e4b26ea8e0c32908de25 (diff)
downloadblackbird-op-linux-df577149594cefacd62740e86de080c6336d699e.tar.gz
blackbird-op-linux-df577149594cefacd62740e86de080c6336d699e.zip
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 'fs/nfsd/nfs4recover.c')
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