diff options
| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-01-30 13:32:58 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:32:58 +0100 |
| commit | 8405b122ad0dd75354b3bfed4de9a96514fd40cb (patch) | |
| tree | 764cb9bc9f262e1191ed8c2785042819dcf2db64 /include/asm-x86/pgtable.h | |
| parent | d8d89827fc0c9c2ea6ac4c22e14e30586a856f58 (diff) | |
x86: unify zero_page definition
Move ZERO_PAGE/empty_zero_page to common place.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-x86/pgtable.h')
| -rw-r--r-- | include/asm-x86/pgtable.h | 8 |
1 files changed, 8 insertions, 0 deletions
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 @@ -118,6 +118,14 @@ 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.. */ |