Messages in this thread Patch in this message | | | From | Paul Burton <> | Subject | [PATCH 3/4] MIPS: Handle highmem pages in __update_cache | Date | Tue, 1 Mar 2016 02:37:58 +0000 |
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The following patch will expose __update_cache to highmem pages. Handle them by mapping them in for the duration of the cache maintenance, just like in __flush_dcache_page. The code for that isn't shared because we need the page address in __update_cache so sharing became messy. Given that the entirity is an extra 5 lines, just duplicate it.
Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: Lars Persson <lars.persson@axis.com> Cc: stable <stable@vger.kernel.org> # v4.1+ ---
arch/mips/mm/cache.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c index 5a67d8c..8befa55 100644 --- a/arch/mips/mm/cache.c +++ b/arch/mips/mm/cache.c @@ -149,9 +149,17 @@ void __update_cache(struct vm_area_struct *vma, unsigned long address, return; page = pfn_to_page(pfn); if (page_mapping(page) && Page_dcache_dirty(page)) { - addr = (unsigned long) page_address(page); + if (PageHighMem(page)) + addr = (unsigned long)kmap_atomic(page); + else + addr = (unsigned long)page_address(page); + if (exec || pages_do_alias(addr, address & PAGE_MASK)) flush_data_cache_page(addr); + + if (PageHighMem(page)) + __kunmap_atomic((void *)addr); + ClearPageDcacheDirty(page); } } -- 2.7.1
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