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XArray: Fix xa_erase of 2-byte aligned entries

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xas_store() was interpreting the entry it found in the array as a node
entry if the bottom two bits had value 2.  That's only true if either
the entry is in the root node or in a non-leaf node.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox
2019-02-21 17:36:45 -05:00
parent 962033d55d
commit 2fbe967b3e
2 changed files with 16 additions and 2 deletions
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16
lib/test_xarray.c
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@@ -1355,6 +1355,20 @@ static void check_align_1(struct xarray *xa, char *name)
xa_destroy(xa);
}
static void check_align_2(struct xarray *xa, char *name)
{
int i;
XA_BUG_ON(xa, !xa_empty(xa));
for (i = 0; i < 8; i++) {
XA_BUG_ON(xa, xa_store(xa, 0, name + i, GFP_KERNEL) != NULL);
xa_erase(xa, 0);
}
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_align(struct xarray *xa)
{
char name[] = "Motorola 68000";
@@ -1363,7 +1377,7 @@ static noinline void check_align(struct xarray *xa)
check_align_1(xa, name + 1);
check_align_1(xa, name + 2);
check_align_1(xa, name + 3);
// check_align_2(xa, name);
check_align_2(xa, name);
}
static LIST_HEAD(shadow_nodes);