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>

diff --git a/arch/blackfin/include/asm/pgtable.h b/arch/blackfin/include/asm/pgtable.h
index 821c699..dcca3e6 100644 (file)
--- a/arch/blackfin/include/asm/pgtable.h
+++ b/arch/blackfin/include/asm/pgtable.h
@@ -80,7 +80,8 @@ PTE_BIT_FUNC(mkyoung, |= _PAGE_ACCESSED);
  * ZERO_PAGE is a global shared page that is always zero: used
  * for zero-mapped memory areas etc..
  */
-#define ZERO_PAGE(vaddr)       (virt_to_page(0))
+#define ZERO_PAGE(vaddr)       virt_to_page(empty_zero_page)
+extern char empty_zero_page[];
 
 extern unsigned int kobjsize(const void *objp);
 

diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c
index 355b87a..10c8a59 100644 (file)
--- 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);