From 8405b122ad0dd75354b3bfed4de9a96514fd40cb Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Wed, 30 Jan 2008 13:32:58 +0100 Subject: x86: unify zero_page definition Move ZERO_PAGE/empty_zero_page to common place. Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- include/asm-x86/pgtable.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/asm-x86/pgtable.h') diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h index 820db41dbe4c..eb14a70a4728 100644 --- a/include/asm-x86/pgtable.h +++ b/include/asm-x86/pgtable.h @@ -117,6 +117,14 @@ extern unsigned long long __PAGE_KERNEL, __PAGE_KERNEL_EXEC; #ifndef __ASSEMBLY__ +/* + * ZERO_PAGE is a global shared page that is always zero: used + * for zero-mapped memory areas etc.. + */ +extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)]; +#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) + + /* * The following only work if pte_present() is true. * Undefined behaviour if not.. -- cgit v1.2.2