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    Subject[PATCH 3.11 047/182] arm64: Do not synchronise I and D caches for special ptes
    Date
    3.11.10.9 -stable review patch.  If anyone has any objections, please let me know.

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

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

    commit 71fdb6bf61bf0692f004f9daf5650392c0cfe300 upstream.

    Special pte mappings are not intended to be executable and do not even
    have an associated struct page. This patch ensures that we do not call
    __sync_icache_dcache() on such ptes.

    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    Reported-by: Steve Capper <Steve.Capper@arm.com>
    Tested-by: Laura Abbott <lauraa@codeaurora.org>
    Tested-by: Bharat Bhushan <Bharat.Bhushan@freescale.com>
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    arch/arm64/include/asm/pgtable.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
    index 5dee621..b2d597b 100644
    --- a/arch/arm64/include/asm/pgtable.h
    +++ b/arch/arm64/include/asm/pgtable.h
    @@ -168,7 +168,7 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
    pte_t *ptep, pte_t pte)
    {
    if (pte_valid_user(pte)) {
    - if (pte_exec(pte))
    + if (!pte_special(pte) && pte_exec(pte))
    __sync_icache_dcache(pte, addr);
    if (!pte_dirty(pte))
    pte = pte_wrprotect(pte);
    --
    1.9.1


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