From: Yuyang Du <duyuyang@gmail.com>
To: peterz@infradead.org, will.deacon@arm.com, mingo@kernel.org
Cc: bvanassche@acm.org, ming.lei@redhat.com, frederic@kernel.org,
tglx@linutronix.de, boqun.feng@gmail.com, paulmck@linux.ibm.com,
linux-kernel@vger.kernel.org, Yuyang Du <duyuyang@gmail.com>
Subject: [PATCH v2 08/17] locking/lockdep: Introduce chain_hlocks_type for held lock's read-write type
Date: Thu, 16 May 2019 16:00:06 +0800 [thread overview]
Message-ID: <20190516080015.16033-9-duyuyang@gmail.com> (raw)
In-Reply-To: <20190516080015.16033-1-duyuyang@gmail.com>
Lock chain needs to include information about the read-write lock type. To
that end, introduce:
chain_hlocks_type[MAX_LOCKDEP_CHAIN_HLOCKS]
in addition to:
chain_hlocks[MAX_LOCKDEP_CHAIN_HLOCKS]
Signed-off-by: Yuyang Du <duyuyang@gmail.com>
---
kernel/locking/lockdep.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 617c0f4..f11d018d 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -861,6 +861,7 @@ static bool class_lock_list_valid(struct lock_class *c, struct list_head *h)
#ifdef CONFIG_PROVE_LOCKING
static u16 chain_hlocks[MAX_LOCKDEP_CHAIN_HLOCKS];
+static u16 chain_hlocks_type[MAX_LOCKDEP_CHAIN_HLOCKS];
#endif
static bool check_lock_chain_key(struct lock_chain *chain)
@@ -2668,6 +2669,7 @@ static inline void inc_chains(void)
static DECLARE_BITMAP(lock_chains_in_use, MAX_LOCKDEP_CHAINS);
int nr_chain_hlocks;
static u16 chain_hlocks[MAX_LOCKDEP_CHAIN_HLOCKS];
+static u16 chain_hlocks_type[MAX_LOCKDEP_CHAIN_HLOCKS];
struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i)
{
@@ -2872,9 +2874,12 @@ static inline int add_chain_cache(struct task_struct *curr,
chain->base = nr_chain_hlocks;
for (j = 0; j < chain->depth - 1; j++, i++) {
int lock_id = curr->held_locks[i].class_idx;
+ int lock_type = curr->held_locks[i].read;
chain_hlocks[chain->base + j] = lock_id;
+ chain_hlocks_type[chain->base + j] = lock_type;
}
chain_hlocks[chain->base + j] = class - lock_classes;
+ chain_hlocks_type[chain->base + j] = hlock->read;
nr_chain_hlocks += chain->depth;
} else {
if (!debug_locks_off_graph_unlock())
@@ -4824,6 +4829,9 @@ static void remove_class_from_lock_chain(struct pending_free *pf,
memmove(&chain_hlocks[i], &chain_hlocks[i + 1],
(chain->base + chain->depth - i) *
sizeof(chain_hlocks[0]));
+ memmove(&chain_hlocks_type[i], &chain_hlocks_type[i + 1],
+ (chain->base + chain->depth - i) *
+ sizeof(chain_hlocks_type[0]));
}
/*
* Each lock class occurs at most once in a lock chain so once
@@ -5268,6 +5276,7 @@ void __init lockdep_init(void)
+ sizeof(lock_chains)
+ sizeof(lock_chains_in_use)
+ sizeof(chain_hlocks)
+ + sizeof(chain_hlocks_type)
#endif
) / 1024
);
--
1.8.3.1
next prev parent reply other threads:[~2019-05-16 8:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-16 7:59 [PATCH v2 00/17] Support for read-write lock deadlock detection Yuyang Du
2019-05-16 7:59 ` [PATCH v2 01/17] locking/lockdep: Add lock type enum to explicitly specify read or write locks Yuyang Du
2019-05-16 8:00 ` [PATCH v2 02/17] locking/lockdep: Add read-write type for dependency Yuyang Du
2019-05-29 11:37 ` Boqun Feng
2019-05-16 8:00 ` [PATCH v2 03/17] locking/lockdep: Add helper functions to operate on the searched path Yuyang Du
2019-05-16 8:00 ` [PATCH v2 04/17] locking/lockdep: Update direct dependency's read-write type if it exists Yuyang Du
2019-05-16 8:00 ` [PATCH v2 05/17] locking/lockdep: Rename deadlock check functions Yuyang Du
2019-05-16 8:00 ` [PATCH v2 06/17] locking/lockdep: Adjust BFS algorithm to support multiple matches Yuyang Du
2019-05-16 8:00 ` [PATCH v2 07/17] locking/lockdep: Introduce mark_lock_unaccessed() Yuyang Du
2019-05-16 8:00 ` Yuyang Du [this message]
2019-05-16 8:00 ` [PATCH v2 09/17] locking/lockdep: Hash held lock's read-write type into chain key Yuyang Du
2019-05-16 8:00 ` [PATCH v2 10/17] locking/lockdep: Support read-write lock's deadlock detection Yuyang Du
2019-05-16 8:00 ` [PATCH v2 11/17] locking/lockdep: Adjust lockdep selftest cases Yuyang Du
2019-05-29 11:44 ` Boqun Feng
2019-05-30 7:37 ` Yuyang Du
2019-05-16 8:00 ` [PATCH v2 12/17] locking/lockdep: Remove useless lock type assignment Yuyang Du
2019-05-16 8:00 ` [PATCH v2 13/17] locking/lockdep: Add nest lock type Yuyang Du
2019-05-16 8:00 ` [PATCH v2 14/17] locking/lockdep: Support recursive read locks Yuyang Du
2019-05-16 8:00 ` [PATCH v2 15/17] locking/lockdep: Adjust selftest case for recursive read lock Yuyang Du
2019-05-16 8:00 ` [PATCH v2 16/17] locking/lockdep: Add more lockdep selftest cases Yuyang Du
2019-05-16 8:00 ` [PATCH v2 17/17] locking/lockdep: Remove irq-safe to irq-unsafe read check Yuyang Du
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