diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/pgtable.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index c3a56f6b1ea5..2a05c3885f85 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -1925,6 +1925,9 @@ static inline void pfnmap_setup_cachemode_pfn(unsigned long pfn, pgprot_t *prot) * for different ranges in the virtual address space. * * zero_page_pfn identifies the first (or the only) pfn for these pages. + * + * For architectures that don't __HAVE_COLOR_ZERO_PAGE the zero page lives in + * empty_zero_page in BSS. */ #ifdef __HAVE_COLOR_ZERO_PAGE static inline int is_zero_pfn(unsigned long pfn) @@ -1951,6 +1954,13 @@ static inline unsigned long zero_pfn(unsigned long addr) return zero_page_pfn; } + +extern uint8_t empty_zero_page[PAGE_SIZE]; + +#ifndef ZERO_PAGE +#define ZERO_PAGE(vaddr) ((void)(vaddr),virt_to_page(empty_zero_page)) +#endif + #endif /* __HAVE_COLOR_ZERO_PAGE */ #ifdef CONFIG_MMU |