From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 3 Mar 2008 08:37:41 +0000 (+0100)
Subject: x86: warn about RAM pages in ioremap()
X-Git-Tag: v2.6.26-rc1~1154^2~494
X-Git-Url: http://git.samba.org/samba.git/?p=sfrench%2Fcifs-2.6.git;a=commitdiff_plain;h=ba748d221eb74b849453a94fdf0e1d0566b407d7;hp=320a6b2efceccb652befca0b1c9a92d6e4256ef6;ds=sidebyside

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 e5608d380176..3d0a589d92c4 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -149,9 +149,11 @@ static void __iomem *__ioremap(resource_size_t phys_addr, unsigned long size,
 	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) {