From 20997b9aca4c529786e84502a537f3333ca95770 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Mon, 27 Sep 2021 14:18:44 +0200
Subject: [PATCH] iommu/mediatek: Fix out-of-range warning with clang
Git-commit: f13efafc1a2cf30d4a74c00f40210d6de36db2d0
Patch-mainline: v5.16-rc1
References: stable-5.14.19
[ 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@arndb.de>
Reviewed-by: Yong Wu <yong.wu@mediatek.com>
Link: https://lore.kernel.org/r/20210927121857.941160-1-arnd@kernel.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/iommu/mtk_iommu.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 6f7c69688ce2..366a9c05642f 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;
--
2.26.2