linux-kernel - [PATCH for 2.6.22] [9/10] i386: Disable alternative() patching after boot with DEBUG

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Message-Id: <20070620102338.18BF914AD0@wotan.suse.de>
Date:	Wed, 20 Jun 2007 12:23:38 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	torvalds@...l.org, linux-kernel@...r.kernel.org, patches@...-64.org
Subject: [PATCH for 2.6.22] [9/10] i386: Disable alternative() patching after boot with DEBUG_RODATA


Kernel text is protected now so this won't work.

We'll fix it better next time.

Signed-off-by: Andi Kleen <ak@...e.de>

---
 arch/i386/kernel/alternative.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux/arch/i386/kernel/alternative.c
===================================================================
--- linux.orig/arch/i386/kernel/alternative.c
+++ linux/arch/i386/kernel/alternative.c
@@ -308,6 +308,11 @@ void alternatives_smp_switch(int smp)
 	printk("lockdep: not fixing up alternatives.\n");
 	return;
 #endif
+#ifdef CONFIG_DEBUG_RODATA
+	/* To be fixed properly post 2.6.22 -- need to get writable
+ 	   mappings of the kernel text */
+	return;
+#endif
 
 	if (noreplace_smp || smp_alt_once)
 		return;
-
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