Quick and dirty init test that kmalloc() alignment works as expected for
power-of-two sizes after the previous patch.
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
---
mm/slab_common.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/mm/slab_common.c b/mm/slab_common.c
index e591d5688558..de10ca9640e0 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1621,3 +1621,22 @@ int should_failslab(struct kmem_cache *s, gfp_t gfpflags)
return 0;
}
ALLOW_ERROR_INJECTION(should_failslab, ERRNO);
+
+static int __init slab_kmalloc_test(void)
+{
+ int i;
+
+ for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) {
+ unsigned int size = 1 << i;
+ void * obj = kmalloc(size, GFP_KERNEL);
+ unsigned long objaddr = (unsigned long) obj;
+
+ printk("Size %u obj %px alignment: %s", size, obj,
+ (((objaddr & (size - 1)) == 0) ? "OK" : "WRONG"));
+ kfree(obj);
+ }
+
+ return 0;
+}
+
+__initcall(slab_kmalloc_test);
--
2.21.0
