linux-kernel - [159/165] xen/setup: Fix for incorrect xen_extra_mem

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Date:	Wed, 01 Jun 2011 17:12:09 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Daniel Kiper <dkiper@...-space.pl>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [159/165] xen/setup: Fix for incorrect xen_extra_mem_start

2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------
 initialization under 32-bit
Content-Length: 1270
Lines: 36

From: Daniel Kiper <dkiper@...-space.pl>

commit 0f16d0dfcdb5aab97d9e368f008b070b5b3ec6d3 upstream.

git commit 24bdb0b62cc82120924762ae6bc85afc8c3f2b26 (xen: do not create
the extra e820 region at an addr lower than 4G) does not take into
account that ifdef CONFIG_X86_32 instead of e820_end_of_low_ram_pfn()
find_low_pfn_range() is called (both calls are from arch/x86/kernel/setup.c).
find_low_pfn_range() behaves correctly and does not require change in
xen_extra_mem_start initialization. Additionally, if xen_extra_mem_start
is initialized in the same way as ifdef CONFIG_X86_64 then memory hotplug
support for Xen balloon driver (under development) is broken.

Signed-off-by: Daniel Kiper <dkiper@...-space.pl>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/xen/setup.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -227,7 +227,11 @@ char * __init xen_memory_setup(void)

 	memcpy(map_raw, map, sizeof(map));
 	e820.nr_map = 0;
+#ifdef CONFIG_X86_32
+	xen_extra_mem_start = mem_end;
+#else
 	xen_extra_mem_start = max((1ULL << 32), mem_end);
+#endif
 	for (i = 0; i < memmap.nr_entries; i++) {
 		unsigned long long end;

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