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author | Frederic Weisbecker <fweisbec@gmail.com> | 2013-02-24 11:59:30 (GMT) |
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committer | Frederic Weisbecker <fweisbec@gmail.com> | 2013-03-07 16:10:21 (GMT) |
commit | b22366cd54c6fe05db426f20adb10f461c19ec06 (patch) | |
tree | 3eb42a6ae0c6b25c27d946e6ffa4787f82ac952f /kernel/fork.c | |
parent | 6c1e0256fad84a843d915414e4b5973b7443d48d (diff) | |
download | linux-b22366cd54c6fe05db426f20adb10f461c19ec06.tar.xz |
context_tracking: Restore preempted context state after preempt_schedule_irq()
From the context tracking POV, preempt_schedule_irq() behaves pretty much
like an exception: It can be called anytime and schedule another task.
But currently it doesn't restore the context tracking state of the preempted
code on preempt_schedule_irq() return.
As a result, if preempt_schedule_irq() is called in the tiny frame between
user_enter() and the actual return to userspace, we resume userspace with
the wrong context tracking state.
Fix this by using exception_enter/exit() which are a perfect fit for this
kind of issue.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Mats Liljegren <mats.liljegren@enea.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/fork.c')
0 files changed, 0 insertions, 0 deletions