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author | Frederic Weisbecker <fweisbec@gmail.com> | 2012-07-11 18:26:39 (GMT) |
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committer | Frederic Weisbecker <fweisbec@gmail.com> | 2012-09-26 13:47:14 (GMT) |
commit | edf55fda35c7dc7f2d9241c3abaddaf759b457c6 (patch) | |
tree | 5350fcb03d0a6db3a212e11787c598d1df184df0 /drivers/rtc/rtc-mc13xxx.c | |
parent | 0430499ce9d78691f3985962021b16bf8f8a8048 (diff) | |
download | linux-fsl-qoriq-edf55fda35c7dc7f2d9241c3abaddaf759b457c6.tar.xz |
x86: Exit RCU extended QS on notify resume
do_notify_resume() may be called on irq or exception
exit. But at that time the exception has already called
rcu_user_enter() and the irq has already called rcu_irq_exit().
Since it can use RCU read side critical section, we must call
rcu_user_exit() before doing anything there. Then we must call
back rcu_user_enter() after this function because we know we are
going to userspace from there.
This complete support for userspace RCU extended quiescent state
in x86-64.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Alessio Igor Bogani <abogani@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Avi Kivity <avi@redhat.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Gilad Ben Yossef <gilad@benyossef.com>
Cc: Hakan Akkan <hakanakkan@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Kevin Hilman <khilman@ti.com>
Cc: Max Krasnyansky <maxk@qualcomm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sven-Thorsten Dietrich <thebigcorporation@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'drivers/rtc/rtc-mc13xxx.c')
0 files changed, 0 insertions, 0 deletions