[Xen-devel] [PATCH] arch/x86/xen/setup: Fix for incorrect xen_extra_mem_start initialization ifdef CONFIG_X86_32

[Daniel Kiper <dkiper@xxxxxxxxxxxx>]

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@xxxxxxxxxxxx>
---
 arch/x86/xen/setup.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 90bac0a..721f576 100644
--- 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;
 
-- 
1.5.6.5

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