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| author | Uladzislau Rezki (Sony) <urezki@gmail.com> | 2023-02-01 18:08:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-05-18 09:21:21 +0300 |
| commit | 3df065841cd7bdb63fcc8a7e7d1bc960524a46ee (patch) | |
| tree | 4ccdc7ea90da1fe14701b7ad0cc38cc59b4b280c /include/linux | |
| parent | e50ee08fafadce9c333975ba2431a4acb2ce69f3 (diff) | |
| download | linux-3df065841cd7bdb63fcc8a7e7d1bc960524a46ee.tar.xz | |
rcu/kvfree: Add kvfree_rcu_mightsleep() and kfree_rcu_mightsleep()
[ Upstream commit 608723c41cd951fb32ade2f8371e61c270816175 ]
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>
Stable-dep-of: 511e64e13d8c ("can: gw: fix RCU/BH usage in cgw_create_job()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/rcupdate.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index d001a69fcb7d..aef8c7304d45 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -1031,6 +1031,9 @@ static inline notrace void rcu_read_unlock_sched_notrace(void) #define kvfree_rcu(...) KVFREE_GET_MACRO(__VA_ARGS__, \ kvfree_rcu_arg_2, kvfree_rcu_arg_1)(__VA_ARGS__) +#define kvfree_rcu_mightsleep(ptr) kvfree_rcu_arg_1(ptr) +#define kfree_rcu_mightsleep(ptr) kvfree_rcu_mightsleep(ptr) + #define KVFREE_GET_MACRO(_1, _2, NAME, ...) NAME #define kvfree_rcu_arg_2(ptr, rhf) \ do { \ |