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authorMike Frysinger <vapier@gentoo.org>2009-04-23 21:28:32 +0000
committerMike Frysinger <vapier@gentoo.org>2010-05-21 09:03:15 -0400
commitf074e48e0a54d8c1370f319ef95e71f796cd8048 (patch)
treeee170cbbf14310c581a1f1b21e6215ede2a04eb1 /arch/blackfin/mm/init.c
parent7a9b149212f3716c598afe973b6261fd58453b7a (diff)
downloadlinux-linaro-android-f074e48e0a54d8c1370f319ef95e71f796cd8048.tar.gz
Blackfin: drop unused bad_page pages and move zero_page to the bss
The empty_bad_page/empty_bad_page_table pages are unused, so punt them. The zero_page is always allocated, so push it out to the bss to speed up the booting process a bit and pack data nicer. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/mm/init.c')
-rw-r--r--arch/blackfin/mm/init.c29
1 files changed, 4 insertions, 25 deletions
diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c
index 355b87aa6b9..10c8a59a96c 100644
--- a/arch/blackfin/mm/init.c
+++ b/arch/blackfin/mm/init.c
@@ -15,23 +15,11 @@
#include "blackfin_sram.h"
/*
- * BAD_PAGE is the page that is used for page faults when linux
- * is out-of-memory. Older versions of linux just did a
- * do_exit(), but using this instead means there is less risk
- * for a process dying in kernel mode, possibly leaving a inode
- * unused etc..
- *
- * BAD_PAGETABLE is the accompanying page-table: it is initialized
- * to point to BAD_PAGE entries.
- *
- * ZERO_PAGE is a special page that is used for zero-initialized
- * data and COW.
+ * ZERO_PAGE is a special page that is used for zero-initialized data and COW.
+ * Let the bss do its zero-init magic so we don't have to do it ourselves.
*/
-static unsigned long empty_bad_page_table;
-
-static unsigned long empty_bad_page;
-
-static unsigned long empty_zero_page;
+char empty_zero_page[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
+EXPORT_SYMBOL(empty_zero_page);
#ifndef CONFIG_EXCEPTION_L1_SCRATCH
#if defined CONFIG_SYSCALL_TAB_L1
@@ -60,15 +48,6 @@ void __init paging_init(void)
pr_debug("start_mem is %#lx virtual_end is %#lx\n", PAGE_ALIGN(memory_start), end_mem);
/*
- * initialize the bad page table and bad page to point
- * to a couple of allocated pages
- */
- empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
- empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
- empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
- memset((void *)empty_zero_page, 0, PAGE_SIZE);
-
- /*
* Set up SFC/DFC registers (user data space)
*/
set_fs(KERNEL_DS);