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authorMatthew Wilcox <willy@infradead.org>2018-06-01 22:46:02 -0400
committerMatthew Wilcox <willy@infradead.org>2018-10-21 10:45:59 -0400
commit4e99d4e9579d3b950bf4b38d0d64eb1b9be78761 (patch)
treea3ecd9d06b4f0eb8bb05369887c9fbe133218e01 /lib/test_xarray.c
parent64d3e9a9e0cc51957d243dd2b0adc5d74ff5e128 (diff)
downloadlinux-stericsson-4e99d4e9579d3b950bf4b38d0d64eb1b9be78761.tar.gz
xarray: Add xas_for_each_conflict
This iterator iterates over each entry that is stored in the index or indices specified by the xa_state. This is intended for use for a conditional store of a multiindex entry, or to allow entries which are about to be removed from the xarray to be disposed of properly. Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'lib/test_xarray.c')
-rw-r--r--lib/test_xarray.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 85ef1882dd3c..8eba3de1baea 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -365,6 +365,73 @@ static noinline void check_multi_store(struct xarray *xa)
#endif
}
+static noinline void __check_store_iter(struct xarray *xa, unsigned long start,
+ unsigned int order, unsigned int present)
+{
+ XA_STATE_ORDER(xas, xa, start, order);
+ void *entry;
+ unsigned int count = 0;
+
+retry:
+ xas_lock(&xas);
+ xas_for_each_conflict(&xas, entry) {
+ XA_BUG_ON(xa, !xa_is_value(entry));
+ XA_BUG_ON(xa, entry < xa_mk_value(start));
+ XA_BUG_ON(xa, entry > xa_mk_value(start + (1UL << order) - 1));
+ count++;
+ }
+ xas_store(&xas, xa_mk_value(start));
+ xas_unlock(&xas);
+ if (xas_nomem(&xas, GFP_KERNEL)) {
+ count = 0;
+ goto retry;
+ }
+ XA_BUG_ON(xa, xas_error(&xas));
+ XA_BUG_ON(xa, count != present);
+ XA_BUG_ON(xa, xa_load(xa, start) != xa_mk_value(start));
+ XA_BUG_ON(xa, xa_load(xa, start + (1UL << order) - 1) !=
+ xa_mk_value(start));
+ xa_erase_index(xa, start);
+}
+
+static noinline void check_store_iter(struct xarray *xa)
+{
+ unsigned int i, j;
+ unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
+
+ for (i = 0; i < max_order; i++) {
+ unsigned int min = 1 << i;
+ unsigned int max = (2 << i) - 1;
+ __check_store_iter(xa, 0, i, 0);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ __check_store_iter(xa, min, i, 0);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ xa_store_index(xa, min, GFP_KERNEL);
+ __check_store_iter(xa, min, i, 1);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ xa_store_index(xa, max, GFP_KERNEL);
+ __check_store_iter(xa, min, i, 1);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ for (j = 0; j < min; j++)
+ xa_store_index(xa, j, GFP_KERNEL);
+ __check_store_iter(xa, 0, i, min);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ for (j = 0; j < min; j++)
+ xa_store_index(xa, min + j, GFP_KERNEL);
+ __check_store_iter(xa, min, i, min);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ }
+#ifdef CONFIG_XARRAY_MULTI
+ xa_store_index(xa, 63, GFP_KERNEL);
+ xa_store_index(xa, 65, GFP_KERNEL);
+ __check_store_iter(xa, 64, 2, 1);
+ xa_erase_index(xa, 63);
+#endif
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
static noinline void check_multi_find(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
@@ -627,6 +694,7 @@ static int xarray_checks(void)
check_find(&array);
check_destroy(&array);
check_move(&array);
+ check_store_iter(&array);
printk("XArray: %u of %u tests passed\n", tests_passed, tests_run);
return (tests_run == tests_passed) ? 0 : -EINVAL;