v3->v4: - Document the new read state and move the conditional compilation code to lockdep.h.
v2->v3: - Add a new read mode (3) for rwlock (used in lock_acquire_shared_cond_recursive()) to avoid conflict with other use cases of lock_acquire_shared_recursive(). v1->v2: - Use less conditional & make it easier to read With the merging of qrwlock into 3.16, it was found that the btrfs filesystem hanged readily. A fix was devised and merged into rc2 and the use of recursive read_lock call was part of the problem. This patch addes code to the lockdep subsystem to catch this kind of recursive read_lock calls in kernel code. Waiman Long (1): lockdep: restrict the use of recursive read_lock with qrwlock include/linux/lockdep.h | 12 ++++++++++++ kernel/locking/lockdep.c | 6 ++++++ 2 files changed, 18 insertions(+), 0 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
