linux-4.4.1/flush_kernel_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_kernel_dcache_page()(arm) へ行く。
• linux-4.4.1/flush_kernel_dcache_page()(arm) の差分を削除

*参照元 [#af300681]
#backlinks

*説明 [#wefc9caf]
-パス: 複数あり
--CONFIG_MMU 無効: [[linux-4.4.1/arch/arm/mm/nommu.c]]
--CONFIG_MMU 有効: [[linux-4.4.1/arch/arm/mm/flush.c]]
--[[linux-4.4.1/CONFIG_MMU]]


-FIXME: これは何？
--説明


**引数 [#ve3b618b]
-struct page *page
--
--[[linux-4.4.1/page]]


**返り値 [#x38cfde4]
-なし


**参考 [#q8e3b023]


*実装 [#e0d8a643]

**CONFIG_MMU 無効: arch/arm/mm/nommu.c [#v90e9ef0]
 void flush_kernel_dcache_page(struct page *page)
 {
         __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
-
--[[linux-4.4.1/__cpuc_flush_dcache_area()]]
--[[linux-4.4.1/page_address()]]
--[[linux-4.4.1/PAGE_SIZE]]

 }
 EXPORT_SYMBOL(flush_kernel_dcache_page);
-
--[[linux-4.4.1/EXPORT_SYMBOL()]]


**CONFIG_MMU 有効: arch/arm/mm/flush.c [#a53a55ad]
 /*
  * Ensure cache coherency for the kernel mapping of this page. We can
  * assume that the page is pinned via kmap.
  *
  * If the page only exists in the page cache and there are no user
  * space mappings, this is a no-op since the page was already marked
  * dirty at creation.  Otherwise, we need to flush the dirty kernel
  * cache lines directly.
  */
 void flush_kernel_dcache_page(struct page *page)
 {
         if (cache_is_vivt() || cache_is_vipt_aliasing()) {
                 struct address_space *mapping;
 
-
--[[linux-4.4.1/cache_is_vivt()]]
--[[linux-4.4.1/cache_is_vipt_aliasing()]]
--[[linux-4.4.1/address_space]]

                 mapping = page_mapping(page);
 
-
--[[linux-4.4.1/page_mapping()]]

                 if (!mapping || mapping_mapped(mapping)) {
                         void *addr;
 
                         addr = page_address(page);
-
--[[linux-4.4.1/mapping_mapped()]]
--[[linux-4.4.1/page_address()]]

                         /*
                          * kmap_atomic() doesn't set the page virtual
                          * address for highmem pages, and
                          * kunmap_atomic() takes care of cache
                          * flushing already.
                          */
                         if (!IS_ENABLED(CONFIG_HIGHMEM) || addr)
                                 __cpuc_flush_dcache_area(addr, PAGE_SIZE);
-
--[[linux-4.4.1/IS_ENABLED()]]
--[[linux-4.4.1/CONFIG_HIGHMEM]]
--[[linux-4.4.1/__cpuc_flush_dcache_area()]]

                 }
         }
 }
 EXPORT_SYMBOL(flush_kernel_dcache_page);
-
--[[linux-4.4.1/EXPORT_SYMBOL()]]


*コメント [#e7a8ccc1]