xen/arm: ensure the xenheap is 32MB aligned

My patch 08693f5948d8 "xen: arm: reduce the size of the xen heap to max 1/8
RAM size" unintentionally violated the constraint that the xenheap must be
32MB aligned, since we only explicitly align the end of the heap and
xenheap_pages was not a multiple of 32 pages.

Round xenheap pages up to a 32MB boundary.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Tim Deegan <tim@xen.org>

diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 1d0b5e902bfaa56ba40a1ea013c4e1105031f0ea..24bbc7392168df0355b5be63361d1d7689a3ce8a 100644 (file)
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -324,7 +324,8 @@ static void __init setup_mm(unsigned long dtb_paddr, size_t dtb_size)
      * constraints.
      */
     heap_pages = (ram_size >> PAGE_SHIFT);
-    xenheap_pages = max(heap_pages/8, 128UL<<(20-PAGE_SHIFT));
+    xenheap_pages = (heap_pages/8 + 0x1fffUL) & ~0x1fffUL;
+    xenheap_pages = max(xenheap_pages, 128UL<<(20-PAGE_SHIFT));
 
     do
     {