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FROMGIT: maple_tree: introduce {mtree,mas}_lock_nested()

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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>

(cherry picked from commit b2472efe4316b2687c153919c1513a098bd82c17
https://git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm mm-unstable)

Bug: 308042511
Change-Id: I06f0eb0a32a2f39b7842de08a0e5ce59895345c5
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Peng Zhang 2023-10-27 11:38:37 +08:00 committed by Suren Baghdasaryan
parent 4ddcdc519b
commit dc9323545b
2 changed files with 5 additions and 0 deletions
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4
include/linux/maple_tree.h
View File

@ -249,6 +249,8 @@ 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))
/*
@ -399,6 +401,8 @@ 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))

1
tools/include/linux/spinlock.h
View File

@ -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)