add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/md/persistent-data/dm-block-manager.c
..
..
@@ -35,7 +35,10 @@
35
35
 #define MAX_HOLDERS 4
36
36
 #define MAX_STACK 10
37
37
 
38
-typedef unsigned long stack_entries[MAX_STACK];
38
+struct stack_store {
39
+	unsigned int	nr_entries;
40
+	unsigned long	entries[MAX_STACK];
41
+};
39
42
 
40
43
 struct block_lock {
41
44
 	spinlock_t lock;
..
..
@@ -44,8 +47,7 @@
44
47
 	struct task_struct *holders[MAX_HOLDERS];
45
48
 
46
49
 #ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING
47
-	struct stack_trace traces[MAX_HOLDERS];
48
-	stack_entries entries[MAX_HOLDERS];
50
+	struct stack_store traces[MAX_HOLDERS];
49
51
 #endif
50
52
 };
51
53
 
..
..
@@ -73,7 +75,7 @@
73
75
 {
74
76
 	unsigned h = __find_holder(lock, NULL);
75
77
 #ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING
76
-	struct stack_trace *t;
78
+	struct stack_store *t;
77
79
 #endif
78
80
 
79
81
 	get_task_struct(task);
..
..
@@ -81,11 +83,7 @@
81
83
 
82
84
 #ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING
83
85
 	t = lock->traces + h;
84
-	t->nr_entries = 0;
85
-	t->max_entries = MAX_STACK;
86
-	t->entries = lock->entries[h];
87
-	t->skip = 2;
88
-	save_stack_trace(t);
86
+	t->nr_entries = stack_trace_save(t->entries, MAX_STACK, 2);
89
87
 #endif
90
88
 }
91
89
 
..
..
@@ -106,7 +104,8 @@
106
104
 			DMERR("recursive lock detected in metadata");
107
105
 #ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING
108
106
 			DMERR("previously held here:");
109
-			print_stack_trace(lock->traces + i, 4);
107
+			stack_trace_print(lock->traces[i].entries,
108
+					  lock->traces[i].nr_entries, 4);
110
109
 
111
110
 			DMERR("subsequent acquisition attempted here:");
112
111
 			dump_stack();
..
..
@@ -462,7 +461,7 @@
462
461
 	int r;
463
462
 
464
463
 	p = dm_bufio_read(bm->bufio, b, (struct dm_buffer **) result);
465
-	if (unlikely(IS_ERR(p)))
464
+	if (IS_ERR(p))
466
465
 		return PTR_ERR(p);
467
466
 
468
467
 	aux = dm_bufio_get_aux_data(to_buffer(*result));
..
..
@@ -498,7 +497,7 @@
498
497
 		return -EPERM;
499
498
 
500
499
 	p = dm_bufio_read(bm->bufio, b, (struct dm_buffer **) result);
501
-	if (unlikely(IS_ERR(p)))
500
+	if (IS_ERR(p))
502
501
 		return PTR_ERR(p);
503
502
 
504
503
 	aux = dm_bufio_get_aux_data(to_buffer(*result));
..
..
@@ -531,7 +530,7 @@
531
530
 	int r;
532
531
 
533
532
 	p = dm_bufio_get(bm->bufio, b, (struct dm_buffer **) result);
534
-	if (unlikely(IS_ERR(p)))
533
+	if (IS_ERR(p))
535
534
 		return PTR_ERR(p);
536
535
 	if (unlikely(!p))
537
536
 		return -EWOULDBLOCK;
..
..
@@ -567,7 +566,7 @@
567
566
 		return -EPERM;
568
567
 
569
568
 	p = dm_bufio_new(bm->bufio, b, (struct dm_buffer **) result);
570
-	if (unlikely(IS_ERR(p)))
569
+	if (IS_ERR(p))
571
570
 		return PTR_ERR(p);
572
571
 
573
572
 	memset(p, 0, dm_bm_block_size(bm));