linux-kernel - Re: -git: BUG: unable to handle kernel paging request at c0100248 [CPU hotplug]

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Date:	Sun, 27 Jul 2008 21:23:10 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Vegard Nossum <vegard.nossum@...il.com>
cc:	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Thomas Meyer <thomas@...3r.de>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: -git: BUG: unable to handle kernel paging request at c0100248
 [CPU hotplug]

On Sun, 27 Jul 2008, Vegard Nossum wrote:
> Booting processor 1/1 ip 6000
> Initializing CPU#1
> [...]
> Write protecting the kernel text: 5648k
> 
> So it succeeds because the protection happens much later :-)

Patch below fixes the issue. I get it to Linus ASAP.

Thanks,

	tglx
---------
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index f67e934..a7010c3 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -456,9 +456,6 @@ is386:	movl $2,%ecx		# set MP
 1:
 #endif /* CONFIG_SMP */
 	jmp *(initial_code)
-.align 4
-ENTRY(initial_code)
-	.long i386_start_kernel
 
 /*
  * We depend on ET to be correct. This checks for 287/387.
@@ -601,6 +598,11 @@ ignore_int:
 #endif
 	iret
 
+.section .cpuinit.data,"wa"
+.align 4
+ENTRY(initial_code)
+	.long i386_start_kernel
+
 .section .text
 /*
  * Real beginning of normal "text" segment
--
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