This is a note to let you know that I've just added the patch titled iommu/mediatek: Fix out-of-range warning with clang to the 5.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iommu-mediatek-fix-out-of-range-warning-with-clang.patch and it can be found in the queue-5.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit f94d2da811ada509b297f3671adf7ea4e4a1dd63 Author: Arnd Bergmann <arnd@xxxxxxxx> Date: Mon Sep 27 14:18:44 2021 +0200 iommu/mediatek: Fix out-of-range warning with clang [ Upstream commit f13efafc1a2cf30d4a74c00f40210d6de36db2d0 ] clang-14 notices that a comparison is never true when CONFIG_PHYS_ADDR_T_64BIT is disabled: drivers/iommu/mtk_iommu.c:553:34: error: result of comparison of constant 5368709120 with expression of type 'phys_addr_t' (aka 'unsigned int') is always false [-Werror,-Wtautological-constant-out-of-range-compare] if (dom->data->enable_4GB && pa >= MTK_IOMMU_4GB_MODE_REMAP_BASE) ~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Add an explicit check for the type of the variable to skip the check and the warning in that case. Fixes: b4dad40e4f35 ("iommu/mediatek: Adjust the PA for the 4GB Mode") Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> Reviewed-by: Yong Wu <yong.wu@xxxxxxxxxxxx> Link: https://lore.kernel.org/r/20210927121857.941160-1-arnd@xxxxxxxxxx Signed-off-by: Joerg Roedel <jroedel@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 6f7c69688ce2a..366a9c05642fa 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -561,7 +561,9 @@ static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain, phys_addr_t pa; pa = dom->iop->iova_to_phys(dom->iop, iova); - if (dom->data->enable_4GB && pa >= MTK_IOMMU_4GB_MODE_REMAP_BASE) + if (IS_ENABLED(CONFIG_PHYS_ADDR_T_64BIT) && + dom->data->enable_4GB && + pa >= MTK_IOMMU_4GB_MODE_REMAP_BASE) pa &= ~BIT_ULL(32); return pa;