linux-kernel - [PATCH v2 2/2] iommu/mediatek: Fix a build warning of BIT(32) in ARM

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Message-ID: <1503560532-24416-2-git-send-email-yong.wu@mediatek.com>
Date:   Thu, 24 Aug 2017 15:42:12 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        Daniel Kurtz <djkurtz@...gle.com>,
        Tomasz Figa <tfiga@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <arnd@...db.de>,
        <honghui.zhang@...iatek.com>, <yong.wu@...iatek.com>
Subject: [PATCH v2 2/2] iommu/mediatek: Fix a build warning of BIT(32) in ARM

The commit ("iommu/mediatek: Enlarge the validate PA range
for 4GB mode") introduce the following build warning while ARCH=arm:

   drivers/iommu/mtk_iommu.c: In function 'mtk_iommu_iova_to_phys':
   include/linux/bitops.h:6:24: warning: left shift count >= width
of type [-Wshift-count-overflow]
    #define BIT(nr)   (1UL << (nr))
                           ^
>> drivers/iommu/mtk_iommu.c:407:9: note: in expansion of macro 'BIT'
      pa |= BIT(32);

  drivers/iommu/mtk_iommu.c: In function 'mtk_iommu_probe':
   include/linux/bitops.h:6:24: warning: left shift count >= width
of type [-Wshift-count-overflow]
    #define BIT(nr)   (1UL << (nr))
                           ^
   drivers/iommu/mtk_iommu.c:589:35: note: in expansion of macro 'BIT'
     data->enable_4GB = !!(max_pfn > (BIT(32) >> PAGE_SHIFT));

Use BIT_ULL instead of BIT.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
 drivers/iommu/mtk_iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index bc00e40..bd515be 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -404,7 +404,7 @@ static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
 	spin_unlock_irqrestore(&dom->pgtlock, flags);
 
 	if (data->enable_4GB)
-		pa |= BIT(32);
+		pa |= BIT_ULL(32);
 
 	return pa;
 }
@@ -586,7 +586,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
 	data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN);
 
 	/* Whether the current dram is over 4GB */
-	data->enable_4GB = !!(max_pfn > (BIT(32) >> PAGE_SHIFT));
+	data->enable_4GB = !!(max_pfn > (BIT_ULL(32) >> PAGE_SHIFT));
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	data->base = devm_ioremap_resource(dev, res);
-- 
1.9.1