linux-4.4.1/__flush_dcache_page()(arm) の変更点

• 追加された行はこの色です。
• 削除された行はこの色です。
• linux-4.4.1/__flush_dcache_page()(arm) へ行く。
• linux-4.4.1/__flush_dcache_page()(arm) の差分を削除

*参照元 [#r6be3104]
#backlinks

*説明 [#d6ade5fc]
-パス: [[linux-4.4.1/arch/arm/mm/flush.c]]

-FIXME: これは何？
--説明


**引数 [#n0930724]
-struct address_space *mapping
--
--[[linux-4.4.1/address_space]]
-struct page *page
--
--[[linux-4.4.1/page]]


**返り値 [#lc5d50ad]
-なし


**参考 [#qf69f3d3]


*実装 [#v2e067b9]
 void __flush_dcache_page(struct address_space *mapping, struct page *page)
 {
         /*
          * Writeback any data associated with the kernel mapping of this
          * page.  This ensures that data in the physical page is mutually
          * coherent with the kernels mapping.
          */
         if (!PageHighMem(page)) {
                 size_t page_size = PAGE_SIZE << compound_order(page);
                 __cpuc_flush_dcache_area(page_address(page), page_size);
-
--[[linux-4.4.1/PageHighMem()]]
--[[linux-4.4.1/PAGE_SIZE]]
--[[linux-4.4.1/compound_order()]]
--[[linux-4.4.1/__cpuc_flush_dcache_area()]]
--[[linux-4.4.1/page_address()]]


         } else {
                 unsigned long i;
                 if (cache_is_vipt_nonaliasing()) {
                         for (i = 0; i < (1 << compound_order(page)); i++) {
                                 void *addr = kmap_atomic(page + i);
                                 __cpuc_flush_dcache_area(addr, PAGE_SIZE);
                                 kunmap_atomic(addr);
                         }
-
--[[linux-4.4.1/cache_is_vipt_nonaliasing()]]
--[[linux-4.4.1/compound_order()]]
--[[linux-4.4.1/kmap_atomic()]]
--[[linux-4.4.1/__cpuc_flush_dcache_area()]]
--[[linux-4.4.1/kunmap_atomic()]]

                 } else {
                         for (i = 0; i < (1 << compound_order(page)); i++) {
                                 void *addr = kmap_high_get(page + i);
                                 if (addr) {
                                         __cpuc_flush_dcache_area(addr, PAGE_SIZE);
                                         kunmap_high(page + i);
                                 }
                         }
-
--[[linux-4.4.1/compound_order()]]
--[[linux-4.4.1/kmap_high_get()]]
--[[linux-4.4.1/__cpuc_flush_dcache_area()]]
--[[linux-4.4.1/kunmap_high()]]

                 }
         }
 
         /*
          * If this is a page cache page, and we have an aliasing VIPT cache,
          * we only need to do one flush - which would be at the relevant
          * userspace colour, which is congruent with page->index.
          */
         if (mapping && cache_is_vipt_aliasing())
                 flush_pfn_alias(page_to_pfn(page),
                                 page->index << PAGE_CACHE_SHIFT);
-
--[[linux-4.4.1/cache_is_vipt_aliasing()]]
--[[linux-4.4.1/flush_pfn_alias()]]
--[[linux-4.4.1/page_to_pfn()]]

 }


*コメント [#ve545de4]