From: Juergen Gross <jgross@suse.com>
Date: Thu, 18 Aug 2016 11:58:42 +0000 (+0200)
Subject: mini-os: correct wrong calculation of alloc bitmap size
X-Git-Tag: xen-4.8.0-rc1~32
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=6958036fe6691db8e7a9238184140eca03b2103b;p=mini-os.git

mini-os: correct wrong calculation of alloc bitmap size

When remapping the page allocator's bitmap for the ballooning support
the calculation of the needed size is wrong. This doesn't really
matter today as nothing is allocated after that bitmap, but it should
be corrected nevertheless.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
---

diff --git a/balloon.c b/balloon.c
index 8d2f151..8669edb 100644
--- a/balloon.c
+++ b/balloon.c
@@ -52,7 +52,7 @@ void mm_alloc_bitmap_remap(void)
 {
     unsigned long i;
 
-    if ( mm_alloc_bitmap_size >= ((nr_max_pages + 1) >> (PAGE_SHIFT + 3)) )
+    if ( mm_alloc_bitmap_size >= ((nr_max_pages + 1) >> 3) )
         return;
 
     for ( i = 0; i < mm_alloc_bitmap_size; i += PAGE_SIZE )
@@ -62,7 +62,7 @@ void mm_alloc_bitmap_remap(void)
     }
 
     mm_alloc_bitmap = (unsigned long *)virt_kernel_area_end;
-    virt_kernel_area_end += round_pgup((nr_max_pages + 1) >> (PAGE_SHIFT + 3));
+    virt_kernel_area_end += round_pgup((nr_max_pages + 1) >> 3);
     ASSERT(virt_kernel_area_end <= VIRT_DEMAND_AREA);
 }