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authorMatthew Wilcox <willy@infradead.org>2018-07-04 10:50:12 -0400
committerMatthew Wilcox <willy@infradead.org>2018-10-21 10:46:32 -0400
commit371c752dc66948714ee3b66c3306f3ff1ff71d2e (patch)
treea9707d94787474e20b4efcd9bc81d5e6e1328a66 /lib/test_xarray.c
parent3d5bd6e1a04ae779bc5e0de9ba2e92aa55c40fe8 (diff)
downloadlinux-stericsson-371c752dc66948714ee3b66c3306f3ff1ff71d2e.tar.gz
xarray: Track free entries in an XArray
Add the optional ability to track which entries in an XArray are free and provide xa_alloc() to replace most of the functionality of the IDR. Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'lib/test_xarray.c')
-rw-r--r--lib/test_xarray.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 6aafd411a5c3..a752e6a37e6f 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -33,6 +33,15 @@ static void *xa_store_index(struct xarray *xa, unsigned long index, gfp_t gfp)
return xa_store(xa, index, xa_mk_value(index & LONG_MAX), gfp);
}
+static void xa_alloc_index(struct xarray *xa, unsigned long index, gfp_t gfp)
+{
+ u32 id = 0;
+
+ XA_BUG_ON(xa, xa_alloc(xa, &id, UINT_MAX, xa_mk_value(index & LONG_MAX),
+ gfp) != 0);
+ XA_BUG_ON(xa, id != index);
+}
+
static void xa_erase_index(struct xarray *xa, unsigned long index)
{
XA_BUG_ON(xa, xa_erase(xa, index) != xa_mk_value(index & LONG_MAX));
@@ -404,6 +413,57 @@ static noinline void check_multi_store(struct xarray *xa)
#endif
}
+static DEFINE_XARRAY_ALLOC(xa0);
+
+static noinline void check_xa_alloc(void)
+{
+ int i;
+ u32 id;
+
+ /* An empty array should assign 0 to the first alloc */
+ xa_alloc_index(&xa0, 0, GFP_KERNEL);
+
+ /* Erasing it should make the array empty again */
+ xa_erase_index(&xa0, 0);
+ XA_BUG_ON(&xa0, !xa_empty(&xa0));
+
+ /* And it should assign 0 again */
+ xa_alloc_index(&xa0, 0, GFP_KERNEL);
+
+ /* The next assigned ID should be 1 */
+ xa_alloc_index(&xa0, 1, GFP_KERNEL);
+ xa_erase_index(&xa0, 1);
+
+ /* Storing a value should mark it used */
+ xa_store_index(&xa0, 1, GFP_KERNEL);
+ xa_alloc_index(&xa0, 2, GFP_KERNEL);
+
+ /* If we then erase 0, it should be free */
+ xa_erase_index(&xa0, 0);
+ xa_alloc_index(&xa0, 0, GFP_KERNEL);
+
+ xa_erase_index(&xa0, 1);
+ xa_erase_index(&xa0, 2);
+
+ for (i = 1; i < 5000; i++) {
+ xa_alloc_index(&xa0, i, GFP_KERNEL);
+ }
+
+ xa_destroy(&xa0);
+
+ id = 0xfffffffeU;
+ XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, UINT_MAX, xa_mk_value(0),
+ GFP_KERNEL) != 0);
+ XA_BUG_ON(&xa0, id != 0xfffffffeU);
+ XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, UINT_MAX, xa_mk_value(0),
+ GFP_KERNEL) != 0);
+ XA_BUG_ON(&xa0, id != 0xffffffffU);
+ XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, UINT_MAX, xa_mk_value(0),
+ GFP_KERNEL) != -ENOSPC);
+ XA_BUG_ON(&xa0, id != 0xffffffffU);
+ xa_destroy(&xa0);
+}
+
static noinline void __check_store_iter(struct xarray *xa, unsigned long start,
unsigned int order, unsigned int present)
{
@@ -849,6 +909,7 @@ static int xarray_checks(void)
check_cmpxchg(&array);
check_reserve(&array);
check_multi_store(&array);
+ check_xa_alloc();
check_find(&array);
check_destroy(&array);
check_move(&array);