From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 30 Jan 2008 12:32:36 +0000 (+0100)
Subject: x86: debug: double-check the empty zero page
X-Git-Tag: v2.6.25-rc1~1143^2~432
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f2633105cd92b793dd6a6f623b4140287d46160a;p=linux-2.6

x86: debug: double-check the empty zero page

temporary debugging - remove before this hits v2.6.25.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 6c3f6eb1f7..05f12c527b 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -497,6 +497,14 @@ void __init mem_init(void)
 
 	/* clear_bss() already clear the empty_zero_page */
 
+	/* temporary debugging - double check it's true: */
+	{
+		int i;
+
+		for (i = 0; i < 1024; i++)
+			WARN_ON_ONCE(empty_zero_page[i]);
+	}
+
 	reservedpages = 0;
 
 	/* this will put all low memory onto the freelists */