forked from Minki/linux
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>
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@ -80,7 +80,8 @@ PTE_BIT_FUNC(mkyoung, |= _PAGE_ACCESSED);
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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#define ZERO_PAGE(vaddr) (virt_to_page(0))
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#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
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extern char empty_zero_page[];
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extern unsigned int kobjsize(const void *objp);
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@ -15,23 +15,11 @@
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#include "blackfin_sram.h"
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/*
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* BAD_PAGE is the page that is used for page faults when linux
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* is out-of-memory. Older versions of linux just did a
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* do_exit(), but using this instead means there is less risk
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* for a process dying in kernel mode, possibly leaving a inode
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* unused etc..
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*
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* BAD_PAGETABLE is the accompanying page-table: it is initialized
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* to point to BAD_PAGE entries.
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*
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* ZERO_PAGE is a special page that is used for zero-initialized
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* data and COW.
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* ZERO_PAGE is a special page that is used for zero-initialized data and COW.
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* Let the bss do its zero-init magic so we don't have to do it ourselves.
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*/
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static unsigned long empty_bad_page_table;
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static unsigned long empty_bad_page;
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static unsigned long empty_zero_page;
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char empty_zero_page[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
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EXPORT_SYMBOL(empty_zero_page);
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#ifndef CONFIG_EXCEPTION_L1_SCRATCH
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#if defined CONFIG_SYSCALL_TAB_L1
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@ -59,15 +47,6 @@ void __init paging_init(void)
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pr_debug("start_mem is %#lx virtual_end is %#lx\n", PAGE_ALIGN(memory_start), end_mem);
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/*
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* initialize the bad page table and bad page to point
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* to a couple of allocated pages
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*/
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empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
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empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
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empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
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memset((void *)empty_zero_page, 0, PAGE_SIZE);
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/*
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* Set up SFC/DFC registers (user data space)
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*/
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