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    Subject[PATCH 3.10 128/129] arm64: Do not flush the D-cache for anonymous pages
    Date
    3.10-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Catalin Marinas <catalin.marinas@arm.com>

    commit 7249b79f6b4cc3c2aa9138dca52e535a4c789107 upstream.

    The D-cache on AArch64 is VIPT non-aliasing, so there is no need to
    flush it for anonymous pages.

    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    Reported-by: Will Deacon <will.deacon@arm.com>
    Acked-by: Will Deacon <will.deacon@arm.com>
    Cc: Mark Brown <broonie@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/arm64/mm/flush.c | 8 +++-----
    arch/arm64/mm/mmu.c | 1 -
    2 files changed, 3 insertions(+), 6 deletions(-)

    --- a/arch/arm64/mm/flush.c
    +++ b/arch/arm64/mm/flush.c
    @@ -77,14 +77,12 @@ void __flush_dcache_page(struct page *pa

    void __sync_icache_dcache(pte_t pte, unsigned long addr)
    {
    - unsigned long pfn;
    - struct page *page;
    + struct page *page = pte_page(pte);

    - pfn = pte_pfn(pte);
    - if (!pfn_valid(pfn))
    + /* no flushing needed for anonymous pages */
    + if (!page_mapping(page))
    return;

    - page = pfn_to_page(pfn);
    if (!test_and_set_bit(PG_dcache_clean, &page->flags)) {
    __flush_dcache_page(page);
    __flush_icache_all();
    --- a/arch/arm64/mm/mmu.c
    +++ b/arch/arm64/mm/mmu.c
    @@ -339,7 +339,6 @@ void __init paging_init(void)
    bootmem_init();

    empty_zero_page = virt_to_page(zero_page);
    - __flush_dcache_page(empty_zero_page);

    /*
    * TTBR0 is only used for the identity mapping at this stage. Make it



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