linux-kernel - [PATCH 10/10] iommu/vt-d: Fix constant-out-of-range warning

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Date: Mon, 19 Feb 2024 19:16:01 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>
Cc: Yi Liu <yi.l.liu@...el.com>,
	Arnd Bergmann <arnd@...db.de>,
	Kevin Tian <kevin.tian@...el.com>,
	Joao Martins <joao.m.martins@...cle.com>,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 10/10] iommu/vt-d: Fix constant-out-of-range warning

From: Arnd Bergmann <arnd@...db.de>

On 32-bit builds, the vt-d driver causes a warning with clang:

drivers/iommu/intel/nested.c:112:13: error: result of comparison of constant 18446744073709551615 with expression of type 'unsigned long' is always false [-Werror,-Wtautological-constant-out-of-range-compare]
  112 |         if (npages == U64_MAX)
      |             ~~~~~~ ^  ~~~~~~~

Make the variable a 64-bit type, which matches both the caller and the
use anyway.

Fixes: f6f3721244a8 ("iommu/vt-d: Add iotlb flush for nested domain")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Link: https://lore.kernel.org/r/20240213095832.455245-1-arnd@kernel.org
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel/nested.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c
index d5af5925a31c..a7d68f3d518a 100644
--- a/drivers/iommu/intel/nested.c
+++ b/drivers/iommu/intel/nested.c
@@ -103,7 +103,7 @@ static void nested_flush_dev_iotlb(struct dmar_domain *domain, u64 addr,
 }
 
 static void intel_nested_flush_cache(struct dmar_domain *domain, u64 addr,
-				     unsigned long npages, bool ih)
+				     u64 npages, bool ih)
 {
 	struct iommu_domain_info *info;
 	unsigned int mask;
-- 
2.34.1