x86: clean up and and print out initial max_pfn_mapped

Do this so we can check the range that is mapped before
init_memory_mapping().

To be able to print out meaningful info, we first have to fix
64-bit to have max_pfn_mapped assigned before that call. This
also unifies the code-path a bit.

[ Impact: print more debug info, cleanup ]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <49BF0978.40605@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 0d77e56e821b..4031d6cb3ff9 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -862,12 +862,16 @@ void __init setup_arch(char **cmdline_p)
                 max_low_pfn = max_pfn;
 
         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
+        max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
 #endif
 
 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
         setup_bios_corruption_check();
 #endif
 
+        printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
+                        max_pfn_mapped<<PAGE_SHIFT);
+
         reserve_brk();
 
         /* max_pfn_mapped is updated here */