linux-kernel - [PATCH] x86_64: remove kernel_physical_mapping

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Message-ID: <20090119214641.GB7476@us.ibm.com>
Date:	Mon, 19 Jan 2009 13:46:41 -0800
From:	Gary Hade <garyhade@...ibm.com>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org, mingo@...e.hu
Cc:	yhlu.kernel@...il.com, garyhade@...ibm.com, lcm@...ibm.com,
	x86@...nel.org
Subject: [PATCH] x86_64: remove kernel_physical_mapping_init() from init
	section

kernel_physical_mapping_init() is called during memory hotplug
so it does not belong in the init section.

If the kernel is built with CONFIG_DEBUG_SECTION_MISMATCH=y on
the make command line, arch/x86/mm/init_64.c is compiled with
the -fno-inline-functions-called-once gcc option defeating
inlining of kernel_physical_mapping_init() within init_memory_mapping().
When kernel_physical_mapping_init() is not inlined it is placed
in the .init.text section according to the __init in it's current
declaration.  A later call to kernel_physical_mapping_init() during
a memory hotplug operation encounters an int3 trap because the
.init.text section memory has been freed.  This patch eliminates
the crash caused by the int3 trap by moving the non-inlined
kernel_physical_mapping_init() from .init.text to .meminit.text.

Signed-off-by: Gary Hade <garyhade@...ibm.com>

---

--- linux-2.6.29-rc2/arch/x86/mm/init_64.c.orig	2009-01-16 14:38:34.000000000 -0800
+++ linux-2.6.29-rc2/arch/x86/mm/init_64.c	2009-01-16 14:39:21.000000000 -0800
@@ -596,7 +596,7 @@ static void __init init_gbpages(void)
 		direct_gbpages = 0;
 }

-static unsigned long __init kernel_physical_mapping_init(unsigned long start,
+static unsigned long __meminit kernel_physical_mapping_init(unsigned long start,
 						unsigned long end,
 						unsigned long page_size_mask)
 {
--
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