[PATCH] x86, mm: Add pointer about Xen mmu requirement foralloc_low_pages

[Stefano Stabellini]

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
 arch/x86/mm/init.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index e98a4b8..88f90f7 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -25,6 +25,13 @@ unsigned long __meminitdata pgt_buf_top;

 static unsigned long min_pfn_mapped;

+/*
+ * Pages returned are already directly mapped.
+ *
+ * Changing that is likely to break Xen, see commit
+ * 279b706bf800b5967037f492dbe4fc5081ad5d0f for more information on the
+ * subject.
+ */
 __ref void *alloc_low_pages(unsigned int num)
 {
 	unsigned long pfn;
-- 
1.7.7.6
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/