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rcu/kvfree: Add kvfree_rcu_mightsleep() and kfree_rcu_mightsleep()
The kvfree_rcu() and kfree_rcu() APIs are hazardous in that if you forget the second argument, it works, but might sleep. This sleeping can be a correctness bug from atomic contexts, and even in non-atomic contexts it might introduce unacceptable latencies. This commit therefore adds kvfree_rcu_mightsleep() and kfree_rcu_mightsleep(), which will replace the single-argument kvfree_rcu() and kfree_rcu(), respectively. This commit enables a series of commits that switch from single-argument kvfree_rcu() and kfree_rcu() to their _mightsleep() counterparts. Once all of these commits land, the single-argument versions will be removed. Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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@ -1004,6 +1004,9 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
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#define kvfree_rcu(...) KVFREE_GET_MACRO(__VA_ARGS__, \
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kvfree_rcu_arg_2, kvfree_rcu_arg_1)(__VA_ARGS__)
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#define kvfree_rcu_mightsleep(ptr) kvfree_rcu_arg_1(ptr)
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#define kfree_rcu_mightsleep(ptr) kvfree_rcu_mightsleep(ptr)
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#define KVFREE_GET_MACRO(_1, _2, NAME, ...) NAME
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#define kvfree_rcu_arg_2(ptr, rhf) \
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do { \
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