From: Peng Zhang zhangpeng.00@bytedance.com
commit b2472efe4316b2687c153919c1513a098bd82c17 upstream.
In some cases, nested locks may be needed, so {mtree,mas}_lock_nested is introduced. For example, when duplicating maple tree, we need to hold the locks of two trees, in which case nested locks are needed.
At the same time, add the definition of spin_lock_nested() in tools for testing.
Link: https://lkml.kernel.org/r/20231027033845.90608-3-zhangpeng.00@bytedance.com Signed-off-by: Peng Zhang zhangpeng.00@bytedance.com Reviewed-by: Liam R. Howlett Liam.Howlett@oracle.com Cc: Christian Brauner brauner@kernel.org Cc: Jonathan Corbet corbet@lwn.net Cc: Mateusz Guzik mjguzik@gmail.com Cc: Mathieu Desnoyers mathieu.desnoyers@efficios.com Cc: Matthew Wilcox willy@infradead.org Cc: Michael S. Tsirkin mst@redhat.com Cc: Mike Christie michael.christie@oracle.com Cc: Nicholas Piggin npiggin@gmail.com Cc: Peter Zijlstra peterz@infradead.org Cc: Suren Baghdasaryan surenb@google.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Yu Kuai yukuai3@huawei.com --- include/linux/maple_tree.h | 4 ++++ tools/include/linux/spinlock.h | 1 + 2 files changed, 5 insertions(+)
diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h index d01e850b570f..f91dbc7fe091 100644 --- a/include/linux/maple_tree.h +++ b/include/linux/maple_tree.h @@ -256,6 +256,8 @@ struct maple_tree { struct maple_tree name = MTREE_INIT(name, 0)
#define mtree_lock(mt) spin_lock((&(mt)->ma_lock)) +#define mtree_lock_nested(mas, subclass) \ + spin_lock_nested((&(mt)->ma_lock), subclass) #define mtree_unlock(mt) spin_unlock((&(mt)->ma_lock))
/* @@ -406,6 +408,8 @@ struct ma_wr_state { };
#define mas_lock(mas) spin_lock(&((mas)->tree->ma_lock)) +#define mas_lock_nested(mas, subclass) \ + spin_lock_nested(&((mas)->tree->ma_lock), subclass) #define mas_unlock(mas) spin_unlock(&((mas)->tree->ma_lock))
diff --git a/tools/include/linux/spinlock.h b/tools/include/linux/spinlock.h index 622266b197d0..a6cdf25b6b9d 100644 --- a/tools/include/linux/spinlock.h +++ b/tools/include/linux/spinlock.h @@ -11,6 +11,7 @@ #define spin_lock_init(x) pthread_mutex_init(x, NULL)
#define spin_lock(x) pthread_mutex_lock(x) +#define spin_lock_nested(x, subclass) pthread_mutex_lock(x) #define spin_unlock(x) pthread_mutex_unlock(x) #define spin_lock_bh(x) pthread_mutex_lock(x) #define spin_unlock_bh(x) pthread_mutex_unlock(x)