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XArray: Permit storing 2-byte-aligned pointers

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On m68k, statically allocated pointers may only be two-byte aligned.
This clashes with the XArray's method for tagging internal pointers.
Permit storing these pointers in single slots (ie not in multislots).

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox
2018-12-28 23:20:44 -05:00
parent 4a31896c5b
commit 76b4e52995
3 changed files with 58 additions and 12 deletions
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30
lib/test_xarray.c
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@@ -1184,6 +1184,35 @@ static noinline void check_store_range(struct xarray *xa)
}
}
static void check_align_1(struct xarray *xa, char *name)
{
int i;
unsigned int id;
unsigned long index;
void *entry;
for (i = 0; i < 8; i++) {
id = 0;
XA_BUG_ON(xa, xa_alloc(xa, &id, UINT_MAX, name + i, GFP_KERNEL)
!= 0);
XA_BUG_ON(xa, id != i);
}
xa_for_each(xa, index, entry)
XA_BUG_ON(xa, xa_is_err(entry));
xa_destroy(xa);
}
static noinline void check_align(struct xarray *xa)
{
char name[] = "Motorola 68000";
check_align_1(xa, name);
check_align_1(xa, name + 1);
check_align_1(xa, name + 2);
check_align_1(xa, name + 3);
// check_align_2(xa, name);
}
static LIST_HEAD(shadow_nodes);
static void test_update_node(struct xa_node *node)
@@ -1333,6 +1362,7 @@ static int xarray_checks(void)
check_create_range(&array);
check_store_range(&array);
check_store_iter(&array);
check_align(&xa0);
check_workingset(&array, 0);
check_workingset(&array, 64);