x86: clean up max_pfn_mapped usage - 32-bit

on 32-bit in head_32.S after initial page table is done, we get initial
max_pfn_mapped, and then kernel_physical_mapping_init will give us
a final one.

We need to use that to make sure find_e820_area will get valid addresses
for boot_map and for NODE_DATA(0) on numa32.

XEN PV and lguest may need to assign max_pfn_mapped too.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index bef4618feadb..ac7002fdd637 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -220,6 +220,8 @@ default_entry:
         jb 10b
 1:
         movl %edi,pa(init_pg_tables_end)
+        shrl $12, %eax
+        movl %eax, pa(max_pfn_mapped)
 
         /* Do early initialization of the fixmap area */
         movl $pa(swapper_pg_fixmap)+PDE_ATTR,%eax
@@ -251,6 +253,8 @@ page_pde_offset = (__PAGE_OFFSET >> 20);
         cmpl %ebp,%eax
         jb 10b
         movl %edi,pa(init_pg_tables_end)
+        shrl $12, %eax
+        movl %eax, pa(max_pfn_mapped)
 
         /* Do early initialization of the fixmap area */
         movl $pa(swapper_pg_fixmap)+PDE_ATTR,%eax