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From:   Arnd Bergmann <arnd@kernel.org>
To:     Alex Deucher <alexander.deucher@amd.com>,
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Subject: [PATCH] drm/amdgpu: avoid integer overflow warning in amdgpu_device_resize_fb_bar()
Date:   Mon,  3 Jul 2023 14:35:49 +0200
Message-Id: <20230703123557.3355657-1-arnd@kernel.org>
MIME-Version: 1.0
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Precedence: bulk

From: Arnd Bergmann <arnd@arndb.de>

On 32-bit architectures comparing a resource against a value larger than
U32_MAX can cause a warning:

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1344:18: error: result of comparison of constant 4294967296 with expression of type 'resource_size_t' (aka 'unsigned int') is always false [-Werror,-Wtautological-constant-out-of-range-compare]
                    res->start > 0x100000000ull)
                    ~~~~~~~~~~ ^ ~~~~~~~~~~~~~~

The compiler is right that this cannot happen in this configuration, which
is ok, so just add a cast to shut up the warning.

Fixes: 31b8adab3247e ("drm/amdgpu: require a root bus window above 4GB for BAR resize")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 7f069e1731fee..abd13942aac5d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1341,7 +1341,7 @@ int amdgpu_device_resize_fb_bar(struct amdgpu_device *adev)
 
 	pci_bus_for_each_resource(root, res, i) {
 		if (res && res->flags & (IORESOURCE_MEM | IORESOURCE_MEM_64) &&
-		    res->start > 0x100000000ull)
+		    (u64)res->start > 0x100000000ull)
 			break;
 	}
 
-- 
2.39.2