sparc32: drop swapper_pg_dir

We save one page of RAM dropping swapper_pg_dir.
It was only used for an assignment in init-mm.c and we
redid this later in srmmu.c anyway.

This is likely a left-over from the sun4c removal.

To avoid a dummy variable we use a simple #define swapper_pg_dir NULL

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h
index cbbbed5..c704f94 100644 (file)
--- a/arch/sparc/include/asm/pgtable_32.h
+++ b/arch/sparc/include/asm/pgtable_32.h
@@ -52,8 +52,9 @@ extern unsigned long calc_highpages(void);
 #define PAGE_READONLY  SRMMU_PAGE_RDONLY
 #define PAGE_KERNEL    SRMMU_PAGE_KERNEL
 
-/* Top-level page directory */
-extern pgd_t swapper_pg_dir[1024];
+/* Top-level page directory - dummy used by init-mm.
+ * srmmu.c will assign the real one (which is dynamically sized) */
+#define swapper_pg_dir NULL
 
 extern void paging_init(void);
 

diff --git a/arch/sparc/kernel/head_32.S b/arch/sparc/kernel/head_32.S
index afeb1d7..3d92c0a 100644 (file)
--- a/arch/sparc/kernel/head_32.S
+++ b/arch/sparc/kernel/head_32.S
@@ -58,8 +58,6 @@ sun4e_notsup:
 /* This was the only reasonable way I could think of to properly align
  * these page-table data structures.
  */
-       .globl swapper_pg_dir
-swapper_pg_dir:                .skip PAGE_SIZE
        .globl empty_zero_page
 empty_zero_page:       .skip PAGE_SIZE