4G will be use as the boarder for X86_64 low/high memory

Signed-off-by: MartinZhang <martinbj2008@gmail.com>
torvalds · Oct 1, 2012 · 2f6215c · 2f6215c
1 parent 155fb48
commit 2f6215c
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
@@ -873,6 +873,9 @@ void __init setup_arch(char **cmdline_p)
 	high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 #endif
 
+	/*[x86_64] [mm] [Junwei]: x86 will split the memeory map(from e820) by 4G(1<<32)*/
+	printk(KERN_INFO "%s:  max_pfn=%lu(%lx), max_low_pfn=%lu(%lx), highmem=%p\n",
+		__func__, max_pfn, max_pfn, max_low_pfn, max_low_pfn, high_memory);
 	/*
 	 * Find and reserve possible boot-time SMP configuration:
 	 */