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List: linux-sparc
Subject: [PATCH 06/18] sparc32: drop swapper_pg_dir
From: Sam Ravnborg <sam () ravnborg ! org>
Date: 2012-07-26 21:02:16
Message-ID: 1343336548-3879-6-git-send-email-sam () ravnborg ! org
[Download RAW message or body]
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>
---
arch/sparc/include/asm/pgtable_32.h | 5 +++--
arch/sparc/kernel/head_32.S | 2 --
2 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h
index cbbbed5..c704f94 100644
--- 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
--- 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
--
1.6.0.6
--
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