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    Subject[PATCH 3/4] MIPS: Handle highmem pages in __update_cache
    Date
    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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