i386 boot: replace boot_ioremap with enhanced bt_ioremap - enhance bt_ioremap

This patch makes it possible for bt_ioremap() to be used before
paging_init(), via providing an early implementation of set_fixmap()
that can be used before paging_init().

This way boot_ioremap() can be replaced by bt_ioremap().

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 206e3f6800b9..f4e1894367a6 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -429,9 +429,11 @@ static void __init pagetable_init (void)
          * Fixed mappings, only the page table structure has to be
          * created - mappings will be set by set_fixmap():
          */
+        bt_ioremap_clear();
         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
         end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
         page_table_range_init(vaddr, end, pgd_base);
+        bt_ioremap_reset();
 
         permanent_kmaps_init(pgd_base);