From 0f16d0dfcdb5aab97d9e368f008b070b5b3ec6d3 Mon Sep 17 00:00:00 2001 From: Daniel Kiper Date: Wed, 11 May 2011 22:34:38 +0200 Subject: [PATCH] xen/setup: Fix for incorrect xen_extra_mem_start initialization under 32-bit 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 Signed-off-by: Konrad Rzeszutek Wilk --- arch/x86/xen/setup.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index fba4a6cc3a2..ca6297bd4e3 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; -- 2.39.2