linux-kernel - [PATCH] x86: Fix 27-rc crash on vsmp due to paravirt during module load

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Message-ID: <20080923055847.GA26882@localdomain>
Date:	Mon, 22 Sep 2008 22:58:47 -0700
From:	Ravikiran G Thirumalai <kiran@...lex86.org>
To:	Ingo Molnar <mingo@...e.hu>, torvalds@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org,
	Glauber de Oliveira Costa <glommer@...il.com>
Subject: [PATCH] x86: Fix 27-rc crash on vsmp due to paravirt during module
	load

27-rc fails to boot up if configured to use modules.  Turns out vsmp_patch
was marked __init, and vsmp_patch being the pvops 'patch' routine for vsmp,
a call to vsmp_patch just turns out to execute a code page with series of 0xcc
(POISON_FREE_INITMEM -- int3).  Since apply_paravirt can only be called during
init/module load, make vsmp_patch with "__init_or_module"

Please apply

Thanks,
Kiran
---

vsmp_patch has been marked with __init ever since pvops, however,
apply_paravirt can be called during module load causing calls to
freed memory location.

Since apply_paravirt can only be called during bootup and module load,
mark vsmp patch with "__init_or_module"

Signed-off-by: Ravikiran Thirumalai <kiran@...lex86.org>

Index: linux-2.6/arch/x86/kernel/vsmp_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/vsmp_64.c	2008-09-19 11:37:54.000000000 -0700
+++ linux-2.6/arch/x86/kernel/vsmp_64.c	2008-09-21 15:50:18.000000000 -0700
@@ -61,7 +61,7 @@
 	native_restore_fl((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));
 }
 
-static unsigned __init vsmp_patch(u8 type, u16 clobbers, void *ibuf,
+static unsigned __init_or_module vsmp_patch(u8 type, u16 clobbers, void *ibuf,
 				  unsigned long addr, unsigned len)
 {
 	switch (type) {

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