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maple_tree: separate ma_state node from status 

The maple tree node is overloaded to keep status as well as the active
node.  This, unfortunately, results in a re-walk on underflow or overflow.
Since the maple state has room, the status can be placed in its own enum
in the structure.  Once an underflow/overflow is detected, certain modes
can restore the status to active and others may need to re-walk just that
one node to see the entry.

The status being an enum has the benefit of detecting unhandled status in
switch statements.

[Liam.Howlett@oracle.com: fix comments about MAS_*]
  Link: https://lkml.kernel.org/r/20231106154124.614247-1-Liam.Howlett@oracle.com
[Liam.Howlett@oracle.com: update forking to separate maple state and node]
  Link: https://lkml.kernel.org/r/20231106154551.615042-1-Liam.Howlett@oracle.com
[Liam.Howlett@oracle.com: fix mas_prev() state separation code]
  Link: https://lkml.kernel.org/r/20231207193319.4025462-1-Liam.Howlett@oracle.com
Link: https://lkml.kernel.org/r/20231101171629.3612299-9-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Peng Zhang <zhangpeng.00@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2023-11-01 13:16:25 -04:00 committed by Andrew Morton
parent 271f61a8b4
commit 067311d33e
6 changed files with 450 additions and 332 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

89
include/linux/maple_tree.h
View File

@ -349,6 +349,36 @@ static inline bool mtree_empty(const struct maple_tree *mt)
/* Advanced API */
/*
* Maple State Status
* ma_active means the maple state is pointing to a node and offset and can
* continue operating on the tree.
* ma_start means we have not searched the tree.
* ma_root means we have searched the tree and the entry we found lives in
* the root of the tree (ie it has index 0, length 1 and is the only entry in
* the tree).
* ma_none means we have searched the tree and there is no node in the
* tree for this entry. For example, we searched for index 1 in an empty
* tree. Or we have a tree which points to a full leaf node and we
* searched for an entry which is larger than can be contained in that
* leaf node.
* ma_pause means the data within the maple state may be stale, restart the
* operation
* ma_overflow means the search has reached the upper limit of the search
* ma_underflow means the search has reached the lower limit of the search
* ma_error means there was an error, check the node for the error number.
*/
enum maple_status {
ma_active,
ma_start,
ma_root,
ma_none,
ma_pause,
ma_overflow,
ma_underflow,
ma_error,
};
/*
* The maple state is defined in the struct ma_state and is used to keep track
* of information during operations, and even between operations when using the
@ -381,6 +411,13 @@ static inline bool mtree_empty(const struct maple_tree *mt)
* When returning a value the maple state index and last respectively contain
* the start and end of the range for the entry. Ranges are inclusive in the
* Maple Tree.
*
* The status of the state is used to determine how the next action should treat
* the state. For instance, if the status is ma_start then the next action
* should start at the root of the tree and walk down. If the status is
* ma_pause then the node may be stale data and should be discarded. If the
* status is ma_overflow, then the last action hit the upper limit.
*
*/
struct ma_state {
struct maple_tree *tree; /* The tree we're operating in */
@ -390,6 +427,7 @@ struct ma_state {
unsigned long min; /* The minimum index of this node - implied pivot min */
unsigned long max; /* The maximum index of this node - implied pivot max */
struct maple_alloc *alloc; /* Allocated nodes for this operation */
enum maple_status status; /* The status of the state (active, start, none, etc) */
unsigned char depth; /* depth of tree descent during write */
unsigned char offset;
unsigned char mas_flags;
@ -416,28 +454,12 @@ struct ma_wr_state {
spin_lock_nested(&((mas)->tree->ma_lock), subclass)
#define mas_unlock(mas) spin_unlock(&((mas)->tree->ma_lock))
/*
* Special values for ma_state.node.
* MAS_START means we have not searched the tree.
* MAS_ROOT means we have searched the tree and the entry we found lives in
* the root of the tree (ie it has index 0, length 1 and is the only entry in
* the tree).
* MAS_NONE means we have searched the tree and there is no node in the
* tree for this entry. For example, we searched for index 1 in an empty
* tree. Or we have a tree which points to a full leaf node and we
* searched for an entry which is larger than can be contained in that
* leaf node.
* MA_ERROR represents an errno. After dropping the lock and attempting
* to resolve the error, the walk would have to be restarted from the
* top of the tree as the tree may have been modified.
*/
#define MAS_START ((struct maple_enode *)1UL)
#define MAS_ROOT ((struct maple_enode *)5UL)
#define MAS_NONE ((struct maple_enode *)9UL)
#define MAS_PAUSE ((struct maple_enode *)17UL)
#define MAS_OVERFLOW ((struct maple_enode *)33UL)
#define MAS_UNDERFLOW ((struct maple_enode *)65UL)
#define MA_ERROR(err) \
((struct maple_enode *)(((unsigned long)err << 2) | 2UL))
@ -446,7 +468,8 @@ struct ma_wr_state {
.tree = mt, \
.index = first, \
.last = end, \
.node = MAS_START, \
.node = NULL, \
.status = ma_start, \
.min = 0, \
.max = ULONG_MAX, \
.alloc = NULL, \
@ -477,7 +500,6 @@ void *mas_find_range(struct ma_state *mas, unsigned long max);
void *mas_find_rev(struct ma_state *mas, unsigned long min);
void *mas_find_range_rev(struct ma_state *mas, unsigned long max);
int mas_preallocate(struct ma_state *mas, void *entry, gfp_t gfp);
bool mas_is_err(struct ma_state *mas);
bool mas_nomem(struct ma_state *mas, gfp_t gfp);
void mas_pause(struct ma_state *mas);
@ -506,28 +528,18 @@ static inline void mas_init(struct ma_state *mas, struct maple_tree *tree,
mas->tree = tree;
mas->index = mas->last = addr;
mas->max = ULONG_MAX;
mas->node = MAS_START;
mas->status = ma_start;
mas->node = NULL;
}
/* Checks if a mas has not found anything */
static inline bool mas_is_none(const struct ma_state *mas)
{
return mas->node == MAS_NONE;
}
/* Checks if a mas has been paused */
static inline bool mas_is_paused(const struct ma_state *mas)
{
return mas->node == MAS_PAUSE;
}
/* Check if the mas is pointing to a node or not */
static inline bool mas_is_active(struct ma_state *mas)
{
if ((unsigned long)mas->node >= MAPLE_RESERVED_RANGE)
return true;
return mas->status == ma_active;
}
return false;
static inline bool mas_is_err(struct ma_state *mas)
{
return mas->status == ma_error;
}
/**
@ -540,9 +552,10 @@ static inline bool mas_is_active(struct ma_state *mas)
*
* Context: Any context.
*/
static inline void mas_reset(struct ma_state *mas)
static __always_inline void mas_reset(struct ma_state *mas)
{
mas->node = MAS_START;
mas->status = ma_start;
mas->node = NULL;
}
/**
@ -716,7 +729,7 @@ static inline void __mas_set_range(struct ma_state *mas, unsigned long start,
static inline
void mas_set_range(struct ma_state *mas, unsigned long start, unsigned long last)
{
mas->node = MAS_START;
mas_reset(mas);
__mas_set_range(mas, start, last);
}

3
include/linux/mm_types.h
View File

@ -1071,7 +1071,8 @@ struct vma_iterator {
.mas = { \
.tree = &(__mm)->mm_mt, \
.index = __addr, \
.node = MAS_START, \
.node = NULL, \
.status = ma_start, \
}, \
}

457
lib/maple_tree.c
View File

File diff suppressed because it is too large Load Diff

199
lib/test_maple_tree.c
View File

@ -54,6 +54,11 @@ atomic_t maple_tree_tests_passed;
#else
#define cond_resched() do {} while (0)
#endif
#define mas_is_none(x) ((x)->status == ma_none)
#define mas_is_overflow(x) ((x)->status == ma_overflow)
#define mas_is_underflow(x) ((x)->status == ma_underflow)
static int __init mtree_insert_index(struct maple_tree *mt,
unsigned long index, gfp_t gfp)
{
@ -582,7 +587,7 @@ static noinline void __init check_find(struct maple_tree *mt)
MT_BUG_ON(mt, last != mas.last);
mas.node = MAS_NONE;
mas.status = ma_none;
mas.index = ULONG_MAX;
mas.last = ULONG_MAX;
entry2 = mas_prev(&mas, 0);
@ -2178,7 +2183,7 @@ static noinline void __init next_prev_test(struct maple_tree *mt)
MT_BUG_ON(mt, val != NULL);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 5);
MT_BUG_ON(mt, mas.node != MAS_UNDERFLOW);
MT_BUG_ON(mt, !mas_is_underflow(&mas));
mas.index = 0;
mas.last = 5;
@ -3042,10 +3047,6 @@ static noinline void __init check_empty_area_fill(struct maple_tree *mt)
* DNE active active range of NULL
*/
#define mas_active(x) (((x).node != MAS_ROOT) && \
((x).node != MAS_START) && \
((x).node != MAS_PAUSE) && \
((x).node != MAS_NONE))
static noinline void __init check_state_handling(struct maple_tree *mt)
{
MA_STATE(mas, mt, 0, 0);
@ -3060,7 +3061,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
/* prev: Start -> underflow*/
entry = mas_prev(&mas, 0);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.node != MAS_UNDERFLOW);
MT_BUG_ON(mt, mas.status != ma_underflow);
/* prev: Start -> root */
mas_set(&mas, 10);
@ -3068,7 +3069,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_ROOT);
MT_BUG_ON(mt, mas.status != ma_root);
/* prev: pause -> root */
mas_set(&mas, 10);
@ -3077,7 +3078,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_ROOT);
MT_BUG_ON(mt, mas.status != ma_root);
/* next: start -> none */
mas_set(&mas, 0);
@ -3085,7 +3086,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, mas.index != 1);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.node != MAS_NONE);
MT_BUG_ON(mt, mas.status != ma_none);
/* next: start -> none*/
mas_set(&mas, 10);
@ -3093,7 +3094,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, mas.index != 1);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.node != MAS_NONE);
MT_BUG_ON(mt, mas.status != ma_none);
/* find: start -> root */
mas_set(&mas, 0);
@ -3101,21 +3102,21 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_ROOT);
MT_BUG_ON(mt, mas.status != ma_root);
/* find: root -> none */
entry = mas_find(&mas, ULONG_MAX);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 1);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, mas.node != MAS_NONE);
MT_BUG_ON(mt, mas.status != ma_none);
/* find: none -> none */
entry = mas_find(&mas, ULONG_MAX);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 1);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, mas.node != MAS_NONE);
MT_BUG_ON(mt, mas.status != ma_none);
/* find: start -> none */
mas_set(&mas, 10);
@ -3123,14 +3124,14 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 1);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, mas.node != MAS_NONE);
MT_BUG_ON(mt, mas.status != ma_none);
/* find_rev: none -> root */
entry = mas_find_rev(&mas, 0);
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_ROOT);
MT_BUG_ON(mt, mas.status != ma_root);
/* find_rev: start -> root */
mas_set(&mas, 0);
@ -3138,21 +3139,21 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_ROOT);
MT_BUG_ON(mt, mas.status != ma_root);
/* find_rev: root -> none */
entry = mas_find_rev(&mas, 0);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_NONE);
MT_BUG_ON(mt, mas.status != ma_none);
/* find_rev: none -> none */
entry = mas_find_rev(&mas, 0);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_NONE);
MT_BUG_ON(mt, mas.status != ma_none);
/* find_rev: start -> root */
mas_set(&mas, 10);
@ -3160,7 +3161,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_ROOT);
MT_BUG_ON(mt, mas.status != ma_root);
/* walk: start -> none */
mas_set(&mas, 10);
@ -3168,7 +3169,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 1);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, mas.node != MAS_NONE);
MT_BUG_ON(mt, mas.status != ma_none);
/* walk: pause -> none*/
mas_set(&mas, 10);
@ -3177,7 +3178,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 1);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, mas.node != MAS_NONE);
MT_BUG_ON(mt, mas.status != ma_none);
/* walk: none -> none */
mas.index = mas.last = 10;
@ -3185,14 +3186,14 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 1);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, mas.node != MAS_NONE);
MT_BUG_ON(mt, mas.status != ma_none);
/* walk: none -> none */
entry = mas_walk(&mas);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 1);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, mas.node != MAS_NONE);
MT_BUG_ON(mt, mas.status != ma_none);
/* walk: start -> root */
mas_set(&mas, 0);
@ -3200,7 +3201,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_ROOT);
MT_BUG_ON(mt, mas.status != ma_root);
/* walk: pause -> root */
mas_set(&mas, 0);
@ -3209,22 +3210,22 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_ROOT);
MT_BUG_ON(mt, mas.status != ma_root);
/* walk: none -> root */
mas.node = MAS_NONE;
mas.status = ma_none;
entry = mas_walk(&mas);
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_ROOT);
MT_BUG_ON(mt, mas.status != ma_root);
/* walk: root -> root */
entry = mas_walk(&mas);
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_ROOT);
MT_BUG_ON(mt, mas.status != ma_root);
/* walk: root -> none */
mas_set(&mas, 10);
@ -3232,7 +3233,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 1);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, mas.node != MAS_NONE);
MT_BUG_ON(mt, mas.status != ma_none);
/* walk: none -> root */
mas.index = mas.last = 0;
@ -3240,7 +3241,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0);
MT_BUG_ON(mt, mas.node != MAS_ROOT);
MT_BUG_ON(mt, mas.status != ma_root);
mas_unlock(&mas);
@ -3258,7 +3259,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* next: pause ->active */
mas_set(&mas, 0);
@ -3267,126 +3268,132 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* next: none ->active */
mas.index = mas.last = 0;
mas.offset = 0;
mas.node = MAS_NONE;
mas.status = ma_none;
entry = mas_next(&mas, ULONG_MAX);
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* next:active ->active */
entry = mas_next(&mas, ULONG_MAX);
/* next:active ->active (spanning limit) */
entry = mas_next(&mas, 0x2100);
MT_BUG_ON(mt, entry != ptr2);
MT_BUG_ON(mt, mas.index != 0x2000);
MT_BUG_ON(mt, mas.last != 0x2500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* next:active -> active beyond data */
/* next:active -> overflow (limit reached) beyond data */
entry = mas_next(&mas, 0x2999);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x2501);
MT_BUG_ON(mt, mas.last != 0x2fff);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_overflow(&mas));
/* Continue after last range ends after max */
/* next:overflow -> active (limit changed) */
entry = mas_next(&mas, ULONG_MAX);
MT_BUG_ON(mt, entry != ptr3);
MT_BUG_ON(mt, mas.index != 0x3000);
MT_BUG_ON(mt, mas.last != 0x3500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* next:active -> active continued */
/* next:active -> overflow (limit reached) */
entry = mas_next(&mas, ULONG_MAX);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x3501);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, !mas_active(mas));
/* next:active -> overflow */
entry = mas_next(&mas, ULONG_MAX);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x3501);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, mas.node != MAS_OVERFLOW);
MT_BUG_ON(mt, !mas_is_overflow(&mas));
/* next:overflow -> overflow */
entry = mas_next(&mas, ULONG_MAX);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x3501);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, mas.node != MAS_OVERFLOW);
MT_BUG_ON(mt, !mas_is_overflow(&mas));
/* prev:overflow -> active */
entry = mas_prev(&mas, 0);
MT_BUG_ON(mt, entry != ptr3);
MT_BUG_ON(mt, mas.index != 0x3000);
MT_BUG_ON(mt, mas.last != 0x3500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* next: none -> active, skip value at location */
mas_set(&mas, 0);
entry = mas_next(&mas, ULONG_MAX);
mas.node = MAS_NONE;
mas.status = ma_none;
mas.offset = 0;
entry = mas_next(&mas, ULONG_MAX);
MT_BUG_ON(mt, entry != ptr2);
MT_BUG_ON(mt, mas.index != 0x2000);
MT_BUG_ON(mt, mas.last != 0x2500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* prev:active ->active */
entry = mas_prev(&mas, 0);
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* prev:active -> active spanning end range */
/* prev:active -> underflow (span limit) */
mas_next(&mas, ULONG_MAX);
entry = mas_prev(&mas, 0x1200);
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_is_active(&mas)); /* spanning limit */
entry = mas_prev(&mas, 0x1200); /* underflow */
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_is_underflow(&mas));
/* prev:underflow -> underflow (lower limit) spanning end range */
entry = mas_prev(&mas, 0x0100);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0x0FFF);
MT_BUG_ON(mt, !mas_active(mas));
/* prev:active -> underflow */
entry = mas_prev(&mas, 0);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0x0FFF);
MT_BUG_ON(mt, mas.node != MAS_UNDERFLOW);
MT_BUG_ON(mt, !mas_is_underflow(&mas));
/* prev:underflow -> underflow */
entry = mas_prev(&mas, 0);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0x0FFF);
MT_BUG_ON(mt, mas.node != MAS_UNDERFLOW);
MT_BUG_ON(mt, !mas_is_underflow(&mas));
/* prev:underflow -> underflow */
entry = mas_prev(&mas, 0);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0x0FFF);
MT_BUG_ON(mt, !mas_is_underflow(&mas));
/* next:underflow -> active */
entry = mas_next(&mas, ULONG_MAX);
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* prev:first value -> underflow */
entry = mas_prev(&mas, 0x1000);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, mas.node != MAS_UNDERFLOW);
MT_BUG_ON(mt, !mas_is_underflow(&mas));
/* find:underflow -> first value */
entry = mas_find(&mas, ULONG_MAX);
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* prev: pause ->active */
mas_set(&mas, 0x3600);
@ -3397,21 +3404,21 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr2);
MT_BUG_ON(mt, mas.index != 0x2000);
MT_BUG_ON(mt, mas.last != 0x2500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* prev:active -> active spanning min */
/* prev:active -> underflow spanning min */
entry = mas_prev(&mas, 0x1600);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x1501);
MT_BUG_ON(mt, mas.last != 0x1FFF);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_underflow(&mas));
/* prev: active ->active, continue */
entry = mas_prev(&mas, 0);
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* find: start ->active */
mas_set(&mas, 0);
@ -3419,7 +3426,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* find: pause ->active */
mas_set(&mas, 0);
@ -3428,7 +3435,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* find: start ->active on value */;
mas_set(&mas, 1200);
@ -3436,14 +3443,14 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* find:active ->active */
entry = mas_find(&mas, ULONG_MAX);
MT_BUG_ON(mt, entry != ptr2);
MT_BUG_ON(mt, mas.index != 0x2000);
MT_BUG_ON(mt, mas.last != 0x2500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* find:active -> active (NULL)*/
@ -3451,35 +3458,35 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x2501);
MT_BUG_ON(mt, mas.last != 0x2FFF);
MT_BUG_ON(mt, !mas_active(mas));
MAS_BUG_ON(&mas, !mas_is_active(&mas));
/* find: overflow ->active */
entry = mas_find(&mas, 0x5000);
MT_BUG_ON(mt, entry != ptr3);
MT_BUG_ON(mt, mas.index != 0x3000);
MT_BUG_ON(mt, mas.last != 0x3500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* find:active -> active (NULL) end*/
entry = mas_find(&mas, ULONG_MAX);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x3501);
MT_BUG_ON(mt, mas.last != ULONG_MAX);
MT_BUG_ON(mt, !mas_active(mas));
MAS_BUG_ON(&mas, !mas_is_active(&mas));
/* find_rev: active (END) ->active */
entry = mas_find_rev(&mas, 0);
MT_BUG_ON(mt, entry != ptr3);
MT_BUG_ON(mt, mas.index != 0x3000);
MT_BUG_ON(mt, mas.last != 0x3500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* find_rev:active ->active */
entry = mas_find_rev(&mas, 0);
MT_BUG_ON(mt, entry != ptr2);
MT_BUG_ON(mt, mas.index != 0x2000);
MT_BUG_ON(mt, mas.last != 0x2500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* find_rev: pause ->active */
mas_pause(&mas);
@ -3487,14 +3494,14 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* find_rev:active -> active */
/* find_rev:active -> underflow */
entry = mas_find_rev(&mas, 0);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0);
MT_BUG_ON(mt, mas.last != 0x0FFF);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_underflow(&mas));
/* find_rev: start ->active */
mas_set(&mas, 0x1200);
@ -3502,7 +3509,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* mas_walk start ->active */
mas_set(&mas, 0x1200);
@ -3510,7 +3517,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* mas_walk start ->active */
mas_set(&mas, 0x1600);
@ -3518,7 +3525,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x1501);
MT_BUG_ON(mt, mas.last != 0x1fff);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* mas_walk pause ->active */
mas_set(&mas, 0x1200);
@ -3527,7 +3534,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* mas_walk pause -> active */
mas_set(&mas, 0x1600);
@ -3536,25 +3543,25 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x1501);
MT_BUG_ON(mt, mas.last != 0x1fff);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* mas_walk none -> active */
mas_set(&mas, 0x1200);
mas.node = MAS_NONE;
mas.status = ma_none;
entry = mas_walk(&mas);
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* mas_walk none -> active */
mas_set(&mas, 0x1600);
mas.node = MAS_NONE;
mas.status = ma_none;
entry = mas_walk(&mas);
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x1501);
MT_BUG_ON(mt, mas.last != 0x1fff);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* mas_walk active -> active */
mas.index = 0x1200;
@ -3564,7 +3571,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != ptr);
MT_BUG_ON(mt, mas.index != 0x1000);
MT_BUG_ON(mt, mas.last != 0x1500);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
/* mas_walk active -> active */
mas.index = 0x1600;
@ -3573,7 +3580,7 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
MT_BUG_ON(mt, entry != NULL);
MT_BUG_ON(mt, mas.index != 0x1501);
MT_BUG_ON(mt, mas.last != 0x1fff);
MT_BUG_ON(mt, !mas_active(mas));
MT_BUG_ON(mt, !mas_is_active(&mas));
mas_unlock(&mas);
}

8
mm/internal.h
View File

@ -1163,13 +1163,13 @@ static inline void vma_iter_store(struct vma_iterator *vmi,
{
#if defined(CONFIG_DEBUG_VM_MAPLE_TREE)
if (MAS_WARN_ON(&vmi->mas, vmi->mas.node != MAS_START &&
if (MAS_WARN_ON(&vmi->mas, vmi->mas.status != ma_start &&
vmi->mas.index > vma->vm_start)) {
pr_warn("%lx > %lx\n store vma %lx-%lx\n into slot %lx-%lx\n",
vmi->mas.index, vma->vm_start, vma->vm_start,
vma->vm_end, vmi->mas.index, vmi->mas.last);
}
if (MAS_WARN_ON(&vmi->mas, vmi->mas.node != MAS_START &&
if (MAS_WARN_ON(&vmi->mas, vmi->mas.status != ma_start &&
vmi->mas.last < vma->vm_start)) {
pr_warn("%lx < %lx\nstore vma %lx-%lx\ninto slot %lx-%lx\n",
vmi->mas.last, vma->vm_start, vma->vm_start, vma->vm_end,
@ -1177,7 +1177,7 @@ static inline void vma_iter_store(struct vma_iterator *vmi,
}
#endif
if (vmi->mas.node != MAS_START &&
if (vmi->mas.status != ma_start &&
((vmi->mas.index > vma->vm_start) || (vmi->mas.last < vma->vm_start)))
vma_iter_invalidate(vmi);
@ -1188,7 +1188,7 @@ static inline void vma_iter_store(struct vma_iterator *vmi,
static inline int vma_iter_store_gfp(struct vma_iterator *vmi,
struct vm_area_struct *vma, gfp_t gfp)
{
if (vmi->mas.node != MAS_START &&
if (vmi->mas.status != ma_start &&
((vmi->mas.index > vma->vm_start) || (vmi->mas.last < vma->vm_start)))
vma_iter_invalidate(vmi);

26
tools/testing/radix-tree/maple.c
View File

@ -118,6 +118,7 @@ static noinline void __init check_new_node(struct maple_tree *mt)
MT_BUG_ON(mt, mas.alloc == NULL);
MT_BUG_ON(mt, mas.alloc->slot[0] == NULL);
mas_push_node(&mas, mn);
mas_reset(&mas);
mas_nomem(&mas, GFP_KERNEL); /* free */
mtree_unlock(mt);
@ -141,7 +142,7 @@ static noinline void __init check_new_node(struct maple_tree *mt)
mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
mas.node = MAS_START;
mas.status = ma_start;
mas_nomem(&mas, GFP_KERNEL);
/* Allocate 3 nodes, will fail. */
mas_node_count(&mas, 3);
@ -158,6 +159,7 @@ static noinline void __init check_new_node(struct maple_tree *mt)
/* Ensure we counted 3. */
MT_BUG_ON(mt, mas_allocated(&mas) != 3);
/* Free. */
mas_reset(&mas);
mas_nomem(&mas, GFP_KERNEL);
/* Set allocation request to 1. */
@ -272,6 +274,7 @@ static noinline void __init check_new_node(struct maple_tree *mt)
ma_free_rcu(mn);
MT_BUG_ON(mt, mas_allocated(&mas) != i - j - 1);
}
mas_reset(&mas);
MT_BUG_ON(mt, mas_nomem(&mas, GFP_KERNEL));
}
@ -294,6 +297,7 @@ static noinline void __init check_new_node(struct maple_tree *mt)
smn = smn->slot[0]; /* next. */
}
MT_BUG_ON(mt, mas_allocated(&mas) != total);
mas_reset(&mas);
mas_nomem(&mas, GFP_KERNEL); /* Free. */
MT_BUG_ON(mt, mas_allocated(&mas) != 0);
@ -441,7 +445,7 @@ static noinline void __init check_new_node(struct maple_tree *mt)
mas.node = MA_ERROR(-ENOMEM);
mas_node_count(&mas, 10); /* Request */
mas_nomem(&mas, GFP_KERNEL); /* Fill request */
mas.node = MAS_START;
mas.status = ma_start;
MT_BUG_ON(mt, mas_allocated(&mas) != 10);
mas_destroy(&mas);
@ -452,7 +456,7 @@ static noinline void __init check_new_node(struct maple_tree *mt)
mas.node = MA_ERROR(-ENOMEM);
mas_node_count(&mas, 10 + MAPLE_ALLOC_SLOTS - 1); /* Request */
mas_nomem(&mas, GFP_KERNEL); /* Fill request */
mas.node = MAS_START;
mas.status = ma_start;
MT_BUG_ON(mt, mas_allocated(&mas) != 10 + MAPLE_ALLOC_SLOTS - 1);
mas_destroy(&mas);
@ -941,7 +945,7 @@ retry:
ret = mas_descend_walk(mas, range_min, range_max);
if (unlikely(mte_dead_node(mas->node))) {
mas->node = MAS_START;
mas->status = ma_start;
goto retry;
}
@ -961,10 +965,10 @@ static inline void *mas_range_load(struct ma_state *mas,
unsigned long index = mas->index;
if (mas_is_none(mas) || mas_is_paused(mas))
mas->node = MAS_START;
mas->status = ma_start;
retry:
if (mas_tree_walk(mas, range_min, range_max))
if (unlikely(mas->node == MAS_ROOT))
if (unlikely(mas->status == ma_root))
return mas_root(mas);
if (likely(mas->offset != MAPLE_NODE_SLOTS))
@ -35337,7 +35341,7 @@ static void mas_dfs_preorder(struct ma_state *mas)
unsigned char end, slot = 0;
unsigned long *pivots;
if (mas->node == MAS_START) {
if (mas->status == ma_start) {
mas_start(mas);
return;
}
@ -35374,7 +35378,7 @@ walk_up:
return;
done:
mas->node = MAS_NONE;
mas->status = ma_none;
}
@ -35833,7 +35837,7 @@ static noinline void __init check_nomem(struct maple_tree *mt)
mas_store(&ms, &ms); /* insert 1 -> &ms, fails. */
MT_BUG_ON(mt, ms.node != MA_ERROR(-ENOMEM));
mas_nomem(&ms, GFP_KERNEL); /* Node allocated in here. */
MT_BUG_ON(mt, ms.node != MAS_START);
MT_BUG_ON(mt, ms.status != ma_start);
mtree_unlock(mt);
MT_BUG_ON(mt, mtree_insert(mt, 2, mt, GFP_KERNEL) != 0);
mtree_lock(mt);
@ -35952,7 +35956,7 @@ static int __init compare_tree(struct maple_tree *mt_a, struct maple_tree *mt_b)
if (mas_is_ptr(&mas_a) || mas_is_ptr(&mas_b)) {
if (!(mas_is_ptr(&mas_a) && mas_is_ptr(&mas_b))) {
pr_err("One is MAS_ROOT and the other is not.\n");
pr_err("One is ma_root and the other is not.\n");
return -1;
}
return 0;
@ -35961,7 +35965,7 @@ static int __init compare_tree(struct maple_tree *mt_a, struct maple_tree *mt_b)
while (!mas_is_none(&mas_a) || !mas_is_none(&mas_b)) {
if (mas_is_none(&mas_a) || mas_is_none(&mas_b)) {
pr_err("One is MAS_NONE and the other is not.\n");
pr_err("One is ma_none and the other is not.\n");
return -1;
}