commit b9d19f4a51447930db002409945ad40a7a373cb0
author Yinghai Lu <yhlu.kernel@gmail.com> Thu Jun 26 00:44:56 2008 -0700
committer Ingo Molnar <mingo@elte.hu> Tue Jul 08 13:10:42 2008 +0200
tree 30e954d9d23f71eb9bc3b462c5ffde78b11588f4
parent 383bc5cecc2ed0b8f44a25488660b03030425ef7

x86: fix memory setup bug

interesting...

[    0.000000]   mapped low ram: 0 - 20000000
[    0.000000]   low ram: 00000000 - 1fff0000
[    0.000000]   bootmap 00002000 - 00006000

max_pfn_mapped > max_low_pfn?

it seems init_memory_mapping reveals an old bug.

please check attached test patch.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/setup_32.c

diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index 4b953dc..392812d 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -427,7 +427,7 @@
 	find_low_pfn_range();
 
 	/* max_pfn_mapped is updated here */
-	init_memory_mapping(0, (max_low_pfn << PAGE_SHIFT));
+	max_pfn_mapped = init_memory_mapping(0, (max_low_pfn << PAGE_SHIFT));
 
 	reserve_initrd();