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locking/lockdep: Add IRQs disabled/enabled assertion APIs

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lockdep_assert_irqs_enabled()/disabled()

Checking whether IRQs are enabled or disabled is a very common sanity
check, however not free of overhead especially on fastpath where such
assertion is very common.

Lockdep is a good host for such concurrency correctness check and it
even already tracks down IRQs disablement state. Just reuse its
machinery. This will allow us to get rid of the flags pop and check
overhead from fast path when kernel is built for production.

Change-Id: I63308fadbe9f42cf2ddf66c115e4c265cf2d3991
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: David S . Miller <davem@davemloft.net>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/1509980490-4285-2-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: mydongistiny <jaysonedson@gmail.com>
Signed-off-by: DennySPB <dennyspb@gmail.com>
This commit is contained in:
Frederic Weisbecker 2017-11-06 16:01:17 +01:00 • committed by xxmustafacooTR
parent 198aca765f
commit 70d9cd11c7
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GPG key ID: 520B6FE385CBF5C9
1 changed files with 15 additions and 0 deletions
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15
include/linux/lockdep.h
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@ -562,9 +562,24 @@ do { \
lock_acquire(&(lock)->dep_map, 0, 0, 1, 1, NULL, _THIS_IP_); \
lock_release(&(lock)->dep_map, 0, _THIS_IP_); \
} while (0)
#define lockdep_assert_irqs_enabled() do { \
WARN_ONCE(debug_locks && !current->lockdep_recursion && \
!current->hardirqs_enabled, \
"IRQs not enabled as expected\n"); \
} while (0)
#define lockdep_assert_irqs_disabled() do { \
WARN_ONCE(debug_locks && !current->lockdep_recursion && \
current->hardirqs_enabled, \
"IRQs not disabled as expected\n"); \
} while (0)
#else
# define might_lock(lock) do { } while (0)
# define might_lock_read(lock) do { } while (0)
# define lockdep_assert_irqs_enabled() do { } while (0)
# define lockdep_assert_irqs_disabled() do { } while (0)
#endif
#ifdef CONFIG_LOCKDEP