Commit f4281bba authored Mar 01, 2016 by Paul Burton Committed by Ralf Baechle May 13, 2016

MIPS: Handle highmem pages in __update_cache



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: Andrew Morton <akpm@linux-foundation.org>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: stable <stable@vger.kernel.org> # v4.1+
Patchwork: https://patchwork.linux-mips.org/patch/12721/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

parent 234859e4

arch/mips/mm/cache.c

+9 −1

Original line number	Diff line number	Diff line
		@@ -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)) {
		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);
		}
		}

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