Shuah Khan 3e31f94752
lockdep: Add lockdep_assert_not_held() ...
Some kernel functions must be called without holding a specific lock.
Add lockdep_assert_not_held() to be used in these functions to detect
incorrect calls while holding a lock.
lockdep_assert_not_held() provides the opposite functionality of
lockdep_assert_held() which is used to assert calls that require
holding a specific lock.
Incorporates suggestions from Peter Zijlstra to avoid misfires when
lockdep_off() is employed.
The need for lockdep_assert_not_held() came up in a discussion on
ath10k patch. ath10k_drain_tx() and i915_vma_pin_ww() are examples
of functions that can use lockdep_assert_not_held().
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org >
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org >
Signed-off-by: Ingo Molnar <mingo@kernel.org >
Link: https://lore.kernel.org/linux-wireless/871rdmu9z9.fsf@codeaurora.org/
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3e31f94752