linux-kernel - [PATCH v2 08/17] locking/lockdep: Introduce chain_hlocks

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Date:   Thu, 16 May 2019 16:00:06 +0800
From:   Yuyang Du <duyuyang@...il.com>
To:     peterz@...radead.org, will.deacon@....com, mingo@...nel.org
Cc:     bvanassche@....org, ming.lei@...hat.com, frederic@...nel.org,
        tglx@...utronix.de, boqun.feng@...il.com, paulmck@...ux.ibm.com,
        linux-kernel@...r.kernel.org, Yuyang Du <duyuyang@...il.com>
Subject: [PATCH v2 08/17] locking/lockdep: Introduce chain_hlocks_type for held lock's read-write type

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@...il.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