mm: don't poison a page if scrub_debug is off

If scrub_debug is off we don't check pages in check_one_page().
Thus there is no reason to ever poison them.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>

diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 2c7675b4d538ed8518f9ffa9892d77b44303df50..2b8bb953695c514b772fa308a33c29adbecd5962 100644 (file)
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -714,6 +714,9 @@ static void poison_one_page(struct page_info *pg)
     mfn_t mfn = _mfn(page_to_mfn(pg));
     uint64_t *ptr;
 
+    if ( !scrub_debug )
+        return;
+
     ptr = map_domain_page(mfn);
     *ptr = ~SCRUB_PATTERN;
     unmap_domain_page(ptr);