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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>
This commit is contained in:
Sam Ravnborg 2012-07-26 11:02:16 +00:00 committed by David S. Miller
parent 7cdfbc74c8
commit 881e02d298
2 changed files with 3 additions and 4 deletions
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5
arch/sparc/include/asm/pgtable_32.h
View File

@ -52,8 +52,9 @@ extern unsigned long calc_highpages(void);
#define PAGE_READONLY SRMMU_PAGE_RDONLY #define PAGE_READONLY SRMMU_PAGE_RDONLY
#define PAGE_KERNEL SRMMU_PAGE_KERNEL #define PAGE_KERNEL SRMMU_PAGE_KERNEL
/* Top-level page directory */ /* Top-level page directory - dummy used by init-mm.
extern pgd_t swapper_pg_dir[1024]; * srmmu.c will assign the real one (which is dynamically sized) */
#define swapper_pg_dir NULL
extern void paging_init(void); extern void paging_init(void);

2
arch/sparc/kernel/head_32.S
View File

@ -58,8 +58,6 @@ sun4e_notsup:
/* This was the only reasonable way I could think of to properly align /* This was the only reasonable way I could think of to properly align
* these page-table data structures. * these page-table data structures.
*/ */
.globl swapper_pg_dir
swapper_pg_dir: .skip PAGE_SIZE
.globl empty_zero_page .globl empty_zero_page
empty_zero_page: .skip PAGE_SIZE empty_zero_page: .skip PAGE_SIZE