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    Subject[PATCH] ARM: Qualify enabling of swiotlb_init()
    Date
    We do not need a SWIOTLB unless we have DRAM that is addressable beyond
    the arm_dma_limit. Compare max_pfn with arm_dma_pfn_limit to determine
    whether we do need a SWIOTLB to be initialized.

    Fixes: ad3c7b18c5b3 ("arm: use swiotlb for bounce buffering on LPAE configs")
    Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
    ---
    arch/arm/mm/init.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
    index 828a2561b229..8356bf1daa28 100644
    --- a/arch/arm/mm/init.c
    +++ b/arch/arm/mm/init.c
    @@ -301,7 +301,11 @@ static void __init free_highpages(void)
    void __init mem_init(void)
    {
    #ifdef CONFIG_ARM_LPAE
    - swiotlb_init(1);
    + if (swiotlb_force == SWIOTLB_FORCE ||
    + max_pfn > arm_dma_pfn_limit)
    + swiotlb_init(1);
    + else
    + swiotlb_force = SWIOTLB_NO_FORCE;
    #endif

    set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
    --
    2.25.1
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