From 5b6e529521d35e1bcaa0fe43456d1bbb335cae5d Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar Date: Tue, 21 Jan 2014 15:50:03 -0800 Subject: [PATCH] x86: memblock: set current limit to max low memory address The memblock current limit value is used to limit early boot memory allocations below max low memory address by default, as the kernel can access only to the low memory. Hence, set memblock current limit value to the max mapped low memory address instead of max mapped memory address. Signed-off-by: Santosh Shilimkar Cc: Tejun Heo Cc: Grygorii Strashko Cc: Yinghai Lu Cc: "Rafael J. Wysocki" Cc: Arnd Bergmann Cc: Christoph Lameter Cc: Greg Kroah-Hartman Cc: H. Peter Anvin Cc: Johannes Weiner Cc: KAMEZAWA Hiroyuki Cc: Konrad Rzeszutek Wilk Cc: Michal Hocko Cc: Paul Walmsley Cc: Pavel Machek Cc: Russell King Cc: Tony Lindgren Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/x86/include/asm/page_types.h | 4 ++-- arch/x86/kernel/setup.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/page_types.h b/arch/x86/include/asm/page_types.h index f97fbe3abb67..2f59cce3b38a 100644 --- a/arch/x86/include/asm/page_types.h +++ b/arch/x86/include/asm/page_types.h @@ -51,9 +51,9 @@ extern int devmem_is_allowed(unsigned long pagenr); extern unsigned long max_low_pfn_mapped; extern unsigned long max_pfn_mapped; -static inline phys_addr_t get_max_mapped(void) +static inline phys_addr_t get_max_low_mapped(void) { - return (phys_addr_t)max_pfn_mapped << PAGE_SHIFT; + return (phys_addr_t)max_low_pfn_mapped << PAGE_SHIFT; } bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn); diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 06853e670354..c9675594d7ca 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1119,7 +1119,7 @@ void __init setup_arch(char **cmdline_p) setup_real_mode(); - memblock_set_current_limit(get_max_mapped()); + memblock_set_current_limit(get_max_low_mapped()); dma_contiguous_reserve(0); /* -- 2.39.5