Tejun Heo
5d5d984e11
freezer: add missing mb's to freezer_count() and freezer_should_skip()
...
commit dd67d32dbc5de299d70cc9e10c6c1e29ffa56b92 upstream.
A task is considered frozen enough between freezer_do_not_count() and
freezer_count() and freezers use freezer_should_skip() to test this
condition. This supposedly works because freezer_count() always calls
try_to_freezer() after clearing %PF_FREEZER_SKIP.
However, there currently is nothing which guarantees that
freezer_count() sees %true freezing() after clearing %PF_FREEZER_SKIP
when freezing is in progress, and vice-versa. A task can escape the
freezing condition in effect by freezer_count() seeing !freezing() and
freezer_should_skip() seeing %PF_FREEZER_SKIP.
This patch adds smp_mb()'s to freezer_count() and
freezer_should_skip() such that either %true freezing() is visible to
freezer_count() or !PF_FREEZER_SKIP is visible to
freezer_should_skip().
Signed-off-by: Tejun Heo <tj@kernel.org >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Rafael J. Wysocki <rjw@sisk.pl >
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
2013-07-12 14:22:54 -07:00
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