x86: warn about RAM pages in ioremap()
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index e5608d3..3d0a589 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -149,9 +149,11 @@
for (pfn = phys_addr >> PAGE_SHIFT;
(pfn << PAGE_SHIFT) < last_addr; pfn++) {
- if (page_is_ram(pfn) && pfn_valid(pfn) &&
- !PageReserved(pfn_to_page(pfn)))
+ int is_ram = page_is_ram(pfn);
+
+ if (is_ram && pfn_valid(pfn) && !PageReserved(pfn_to_page(pfn)))
return NULL;
+ WARN_ON_ONCE(is_ram);
}
switch (mode) {