- 追加された行はこの色です。
- 削除された行はこの色です。
*参照元 [#wfde4532]
#backlinks
*説明 [#k8dd8a6f]
-パス: [[linux-4.4.1/arch/arm/mm/flush.c]]
-FIXME: これは何?
--説明
**引数 [#m7cde16f]
-struct page *page
--
--[[linux-4.4.1/page]]
**返り値 [#b8106671]
-なし
**参考 [#hc3d6f43]
*実装 [#o367d59f]
/*
* Ensure cache coherency between kernel mapping and userspace mapping
* of this page.
*
* We have three cases to consider:
* - VIPT non-aliasing cache: fully coherent so nothing required.
* - VIVT: fully aliasing, so we need to handle every alias in our
* current VM view.
* - VIPT aliasing: need to handle one alias in our current VM view.
*
* If we need to handle aliasing:
* If the page only exists in the page cache and there are no user
* space mappings, we can be lazy and remember that we may have dirty
* kernel cache lines for later. Otherwise, we assume we have
* aliasing mappings.
*
* Note that we disable the lazy flush for SMP configurations where
* the cache maintenance operations are not automatically broadcasted.
*/
void flush_dcache_page(struct page *page)
{
struct address_space *mapping;
-
--[[linux-4.4.1/address_space]]
/*
* The zero page is never written to, so never has any dirty
* cache lines, and therefore never needs to be flushed.
*/
if (page == ZERO_PAGE(0))
return;
-
--[[linux-4.4.1/ZERO_PAGE()]]
mapping = page_mapping(page);
-
--[[linux-4.4.1/page_mapping()]]
if (!cache_ops_need_broadcast() &&
mapping && !page_mapped(page))
clear_bit(PG_dcache_clean, &page->flags);
-
--[[linux-4.4.1/cache_ops_need_broadcast()]]
--[[linux-4.4.1/page_mapped()]]
--[[linux-4.4.1/clear_bit()]]
else {
__flush_dcache_page(mapping, page);
-
--[[linux-4.4.1/__flush_dcache_page()]]
if (mapping && cache_is_vivt())
__flush_dcache_aliases(mapping, page);
-
--[[linux-4.4.1/cache_is_vivt()]]
--[[linux-4.4.1/__flush_dcache_aliases()]]
else if (mapping)
__flush_icache_all();
-
--[[linux-4.4.1/__flush_icache_all()]]
set_bit(PG_dcache_clean, &page->flags);
-
--[[linux-4.4.1/set_bit()]]
}
}
EXPORT_SYMBOL(flush_dcache_page);
-
--[[linux-4.4.1/EXPORT_SYMBOL()]]
*コメント [#waa4e05d]