[Xen-changelog] [xen master] mm: don't poison a page if scrub_debug is off

[patchbot@xxxxxxx]

commit f65bf735f17235c5077c83550259cacf4090b28b
Author:     Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
AuthorDate: Fri Sep 1 11:06:03 2017 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Sep 1 11:06:03 2017 +0200

    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@xxxxxxxxxx>
    Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 xen/common/page_alloc.c | 3 +++
 1 file changed, 3 insertions(+)

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);
--
generated by git-patchbot for /home/xen/git/xen.git#master

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