From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Date: Mon, 16 Apr 2018 12:11:09 +0000 (+0200)
Subject: mm: fix emfn calculation in init_domheap_pages()
X-Git-Tag: archive/raspbian/4.11.1-1+rpi1~1^2~66^2~180
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=87c0718ce7f0fe80065c8f54d99774e0741780f2;p=xen.git

mm: fix emfn calculation in init_domheap_pages()

The "end" address must be rounded down before shifting,
otherwise we will insert wrong page range to a heap if address isn't
page aligned.

It seems that a copy-paste mistake took place in the following commit:
0c12972e34b20a26f2b42044b98bf12db7ed62b6
xen/mm: Switch some of page_alloc.c to typesafe MFN

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Release-acked-by: Juergen Gross <jgross@suse.com>
---

diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 186b39a6c8..20ee1e4897 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -2166,7 +2166,7 @@ void init_domheap_pages(paddr_t ps, paddr_t pe)
     ASSERT(!in_irq());
 
     smfn = maddr_to_mfn(round_pgup(ps));
-    emfn = maddr_to_mfn(round_pgup(pe));
+    emfn = maddr_to_mfn(round_pgdown(pe));
 
     if ( mfn_x(emfn) <= mfn_x(smfn) )
         return;