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[v2,3/4] mm: Don't poison a page if scrub_debug is off

Message ID 1504185374-7581-4-git-send-email-boris.ostrovsky@oracle.com (mailing list archive)
State New, archived
Headers show

Commit Message

Boris Ostrovsky Aug. 31, 2017, 1:16 p.m. UTC 
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>
---
 xen/common/page_alloc.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 2c7675b..2b8bb95 100644
--- 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);