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maple_tree: revise limit checks in mas_empty_area{_rev}() 

Since the maple tree is inclusive in range, ensure that a range of 1 (min
= max) works for searching for a gap in either direction, and make sure
the size is at least 1 but not larger than the delta between min and max.

This commit also updates the testing.  Unfortunately there isn't a way to
safely update the tests and code without a test failure.

Link: https://lkml.kernel.org/r/20230518145544.1722059-26-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Suggested-by: Peng Zhang <zhangpeng.00@bytedance.com>
Cc: David Binderman <dcb314@hotmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Vernon Yang <vernon2gm@gmail.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2023-05-18 10:55:34 -04:00 committed by Andrew Morton
parent 39193685d5
commit ba9972121a
2 changed files with 34 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
lib/maple_tree.c
View File

@ -5283,7 +5283,10 @@ int mas_empty_area(struct ma_state *mas, unsigned long min,
unsigned long *pivots;
enum maple_type mt;
if (min >= max)
if (min > max)
return -EINVAL;
if (size == 0 || max - min < size - 1)
return -EINVAL;
if (mas_is_start(mas))
@ -5332,7 +5335,10 @@ int mas_empty_area_rev(struct ma_state *mas, unsigned long min,
{
struct maple_enode *last = mas->node;
if (min >= max)
if (min > max)
return -EINVAL;
if (size == 0 || max - min < size - 1)
return -EINVAL;
if (mas_is_start(mas)) {
@ -5368,7 +5374,7 @@ int mas_empty_area_rev(struct ma_state *mas, unsigned long min,
return -EBUSY;
/* Trim the upper limit to the max. */
if (max <= mas->last)
if (max < mas->last)
mas->last = max;
mas->index = mas->last - size + 1;
@ -6404,7 +6410,7 @@ int mtree_alloc_range(struct maple_tree *mt, unsigned long *startp,
{
int ret = 0;
MA_STATE(mas, mt, min, max - size);
MA_STATE(mas, mt, min, min);
if (!mt_is_alloc(mt))
return -EINVAL;
@ -6424,7 +6430,7 @@ int mtree_alloc_range(struct maple_tree *mt, unsigned long *startp,
retry:
mas.offset = 0;
mas.index = min;
mas.last = max - size;
mas.last = max - size + 1;
ret = mas_alloc(&mas, entry, size, startp);
if (mas_nomem(&mas, gfp))
goto retry;
@ -6440,14 +6446,14 @@ int mtree_alloc_rrange(struct maple_tree *mt, unsigned long *startp,
{
int ret = 0;
MA_STATE(mas, mt, min, max - size);
MA_STATE(mas, mt, min, max - size + 1);
if (!mt_is_alloc(mt))
return -EINVAL;
if (WARN_ON_ONCE(mt_is_reserved(entry)))
return -EINVAL;
if (min >= max)
if (min > max)
return -EINVAL;
if (max < size - 1)

28
lib/test_maple_tree.c
View File

@ -123,7 +123,7 @@ static noinline void __init check_mtree_alloc_rrange(struct maple_tree *mt,
unsigned long result = expected + 1;
int ret;
ret = mtree_alloc_rrange(mt, &result, ptr, size, start, end - 1,
ret = mtree_alloc_rrange(mt, &result, ptr, size, start, end,
GFP_KERNEL);
MT_BUG_ON(mt, ret != eret);
if (ret)
@ -701,7 +701,7 @@ static noinline void __init check_alloc_rev_range(struct maple_tree *mt)
0, /* Return value success. */
0x0, /* Min */
0x565234AF1 << 12, /* Max */
0x565234AF0 << 12, /* Max */
0x3000, /* Size */
0x565234AEE << 12, /* max - 3. */
0, /* Return value success. */
@ -713,14 +713,14 @@ static noinline void __init check_alloc_rev_range(struct maple_tree *mt)
0, /* Return value success. */
0x0, /* Min */
0x7F36D510A << 12, /* Max */
0x7F36D5109 << 12, /* Max */
0x4000, /* Size */
0x7F36D5106 << 12, /* First rev hole of size 0x4000 */
0, /* Return value success. */
/* Ascend test. */
0x0,
34148798629 << 12,
34148798628 << 12,
19 << 12,
34148797418 << 12,
0x0,
@ -732,6 +732,12 @@ static noinline void __init check_alloc_rev_range(struct maple_tree *mt)
0x0,
-EBUSY,
/* Single space test. */
34148798725 << 12,
34148798725 << 12,
1 << 12,
34148798725 << 12,
0,
};
int i, range_count = ARRAY_SIZE(range);
@ -780,9 +786,9 @@ static noinline void __init check_alloc_rev_range(struct maple_tree *mt)
mas_unlock(&mas);
for (i = 0; i < req_range_count; i += 5) {
#if DEBUG_REV_RANGE
pr_debug("\tReverse request between %lu-%lu size %lu, should get %lu\n",
req_range[i] >> 12,
(req_range[i + 1] >> 12) - 1,
pr_debug("\tReverse request %d between %lu-%lu size %lu, should get %lu\n",
i, req_range[i] >> 12,
(req_range[i + 1] >> 12),
req_range[i+2] >> 12,
req_range[i+3] >> 12);
#endif
@ -798,6 +804,7 @@ static noinline void __init check_alloc_rev_range(struct maple_tree *mt)
mt_set_non_kernel(1);
mtree_erase(mt, 34148798727); /* create a deleted range. */
mtree_erase(mt, 34148798725);
check_mtree_alloc_rrange(mt, 0, 34359052173, 210253414,
34148798725, 0, mt);
@ -901,6 +908,13 @@ static noinline void __init check_alloc_range(struct maple_tree *mt)
4503599618982063UL << 12, /* Size */
34359052178 << 12, /* Expected location */
-EBUSY, /* Return failure. */
/* Test a single entry */
34148798648 << 12, /* Min */
34148798648 << 12, /* Max */
4096, /* Size of 1 */
34148798648 << 12, /* Location is the same as min/max */
0, /* Success */
};
int i, range_count = ARRAY_SIZE(range);
int req_range_count = ARRAY_SIZE(req_range);