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a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=6UeiqGixMTsA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=yPCof4ZbAAAA:8 a=VwQbUJbxAAAA:8 a=-4f2oCayxw7h4Rz1qIcA:9 cc=ntf awl=host:13642 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTE1MDAzMSBTYWx0ZWRfX+4GACq06+m0G 6YwyvhI/+e6Zy6Z9hxu+D8MqG5j5BUow9dzkKaXdH4IRM1IRv55vROELl2x84jCw0eqBX7YdU/Z H8djaWPDKiVcWm2mPNB9RJLRJMTYepCrYo+95WXKbmmM81Ld/Qfmm5Dtv0nCHnmLYF+8R+SmrGL hivCQEpWi3X/h31UrJ+rVbig+84TkQqSmDddQpIrSh/SSsYuxTWqiAHjNVMoLHVpCYDm+W914+z efXAfzQDgM2tOGbtaKomhOjO2ftBIz3EXPzCYcJ3NPOqDHKPUQ3FacNw+cR2DF4r8bNj4RVjaiL 7Go3RF0qR5zaJxg+YXxOgTurjqiBgc5//vaxOqxQd0m0jyyCmMjsOhqhzzPSYgrkfGYv7jMDj7V Lynp8zK7RAfJyPpZBiDPid9Bj5NsAcKIYF9jpOtcUBMJIRhVZZY= X-Proofpoint-ORIG-GUID: S_6RecttVZQzGeo9w48qZ7mDMrUOodcC Content-Type: text/plain; charset="utf-8" Introduce clear_pages(), to be overridden by architectures that support more efficient clearing of consecutive pages. Also introduce clear_user_pages(), however, we will not expect this function to be overridden anytime soon. We have to place the clear_user_pages() variant that uses clear_user_page() into mm/util.c for now to work around macro magic on sparc and m68k. Signed-off-by: Ankur Arora Acked-by: David Hildenbrand (Red Hat) --- Notes: - Use macros clear_pages, clear_user_page, instead of __HAVE_ARCH_CLEAR_= PAGES, __HAVE_ARCH_CLEAR_USER_PAGE. include/linux/mm.h | 41 +++++++++++++++++++++++++++++++++++++++++ mm/util.c | 13 +++++++++++++ 2 files changed, 54 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 6fa6c188f99a..c397ee2f6dd5 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3879,6 +3879,26 @@ static inline void clear_page_guard(struct zone *zon= e, struct page *page, unsigned int order) {} #endif /* CONFIG_DEBUG_PAGEALLOC */ =20 +#ifndef clear_pages +/** + * clear_pages() - clear a page range for kernel-internal use. + * @addr: start address + * @npages: number of pages + * + * Use clear_user_pages() instead when clearing a page range to be + * mapped to user space. + * + * Does absolutely no exception handling. + */ +static inline void clear_pages(void *addr, unsigned int npages) +{ + do { + clear_page(addr); + addr +=3D PAGE_SIZE; + } while (--npages); +} +#endif + #ifndef clear_user_page /** * clear_user_page() - clear a page to be mapped to user space @@ -3901,6 +3921,27 @@ static inline void clear_user_page(void *addr, unsig= ned long vaddr, struct page } #endif =20 +/** + * clear_user_pages() - clear a page range to be mapped to user space + * @addr: start address + * @vaddr: start address of the user mapping + * @page: start page + * @npages: number of pages + * + * Assumes that the region (@addr, +@npages) has been validated + * already so this does no exception handling. + */ +#ifdef clear_user_pages +void clear_user_pages(void *addr, unsigned long vaddr, + struct page *page, unsigned int npages); +#else +static inline void clear_user_pages(void *addr, unsigned long vaddr, + struct page *page, unsigned int npages) +{ + clear_pages(addr, npages); +} +#endif + #ifdef __HAVE_ARCH_GATE_AREA extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); extern int in_gate_area_no_mm(unsigned long addr); diff --git a/mm/util.c b/mm/util.c index 8989d5767528..3c6cd44db1bd 100644 --- a/mm/util.c +++ b/mm/util.c @@ -1344,3 +1344,16 @@ bool page_range_contiguous(const struct page *page, = unsigned long nr_pages) } EXPORT_SYMBOL(page_range_contiguous); #endif + +#ifdef clear_user_page +void clear_user_pages(void *addr, unsigned long vaddr, + struct page *page, unsigned int npages) +{ + do { + clear_user_page(addr, vaddr, page); + addr +=3D PAGE_SIZE; + vaddr +=3D PAGE_SIZE; + page++; + } while (--npages); +} +#endif --=20 2.31.1