forked from luck/tmp_suning_uos_patched
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>
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include/asm-x86
@ -117,6 +117,14 @@ extern unsigned long long __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
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#ifndef __ASSEMBLY__
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/*
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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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extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
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#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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@ -25,12 +25,6 @@
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struct mm_struct;
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struct vm_area_struct;
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/*
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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(empty_zero_page))
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extern unsigned long empty_zero_page[1024];
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extern pgd_t swapper_pg_dir[1024];
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extern struct kmem_cache *pmd_cache;
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extern spinlock_t pgd_lock;
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@ -23,13 +23,6 @@ extern pgd_t init_level4_pgt[];
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extern void paging_init(void);
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extern void clear_kernel_mapping(unsigned long addr, unsigned long size);
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/*
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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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extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
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#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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#endif /* !__ASSEMBLY__ */
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/*
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