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charset="utf-8" This ensures that preempt_count will be accounted correctly during in-hypevisor context switches. Signed-off-by: Volodymyr Babchuk --- xen/common/preempt.c | 6 +++--- xen/include/xen/preempt.h | 9 ++++----- 2 files changed, 7 insertions(+), 8 deletions(-) diff --git a/xen/common/preempt.c b/xen/common/preempt.c index 3b4178fd44..ad61c8419a 100644 --- a/xen/common/preempt.c +++ b/xen/common/preempt.c @@ -23,17 +23,17 @@ #include #include =20 -DEFINE_PER_CPU(unsigned int, __preempt_count); +DEFINE_PER_CPU(atomic_t, __preempt_count); =20 bool_t in_atomic(void) { - return preempt_count() || in_irq() || !local_irq_is_enabled(); + return atomic_read(&preempt_count()) || in_irq() || local_irq_is_enabl= ed(); } =20 #ifndef NDEBUG void ASSERT_NOT_IN_ATOMIC(void) { - ASSERT(!preempt_count()); + ASSERT(!atomic_read(&preempt_count())); ASSERT(!in_irq()); ASSERT(local_irq_is_enabled()); } diff --git a/xen/include/xen/preempt.h b/xen/include/xen/preempt.h index bef83135a1..e217900d6e 100644 --- a/xen/include/xen/preempt.h +++ b/xen/include/xen/preempt.h @@ -9,21 +9,20 @@ #ifndef __XEN_PREEMPT_H__ #define __XEN_PREEMPT_H__ =20 +#include #include #include =20 -DECLARE_PER_CPU(unsigned int, __preempt_count); +DECLARE_PER_CPU(atomic_t, __preempt_count); =20 #define preempt_count() (this_cpu(__preempt_count)) =20 #define preempt_disable() do { \ - preempt_count()++; \ - barrier(); \ + atomic_inc(&preempt_count()); \ } while (0) =20 #define preempt_enable() do { \ - barrier(); \ - preempt_count()--; \ + atomic_dec(&preempt_count()); \ } while (0) =20 bool_t in_atomic(void); --=20 2.29.2