linux-kernel - [PATCH 19/44] drivers/gpu/drm/amd: use min() instead of min

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Message-Id: <20251119224140.8616-20-david.laight.linux@gmail.com>
Date: Wed, 19 Nov 2025 22:41:15 +0000
From: david.laight.linux@...il.com
To: linux-kernel@...r.kernel.org,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Cc: Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	David Airlie <airlied@...il.com>,
	Harry Wentland <harry.wentland@....com>,
	Leo Li <sunpeng.li@....com>,
	Simona Vetter <simona@...ll.ch>,
	David Laight <david.laight.linux@...il.com>
Subject: [PATCH 19/44] drivers/gpu/drm/amd: use min() instead of min_t()

From: David Laight <david.laight.linux@...il.com>

min_t(unsigned int, a, b) casts an 'unsigned long' to 'unsigned int'.
Use min(a, b) instead as it promotes any 'unsigned int' to 'unsigned long'
and so cannot discard significant bits.

min_t(u8, a, b) is particularly likely to be problematic

In this case I think the values are small enough that the result is ok.

Detected by an extra check added to min_t().

Signed-off-by: David Laight <david.laight.linux@...il.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c  | 4 ++--
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c            | 2 +-
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
index 3040437d99c2..1eb88327a18b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
@@ -211,8 +211,8 @@ int amdgpu_doorbell_init(struct amdgpu_device *adev)
 	adev->doorbell.size = pci_resource_len(adev->pdev, 2);
 
 	adev->doorbell.num_kernel_doorbells =
-		min_t(u32, adev->doorbell.size / sizeof(u32),
-		      adev->doorbell_index.max_assignment + 1);
+		min(adev->doorbell.size / sizeof(u32),
+		    adev->doorbell_index.max_assignment + 1);
 	if (adev->doorbell.num_kernel_doorbells == 0)
 		return -EINVAL;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index c1a801203949..124ce3e7310e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2388,7 +2388,7 @@ void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint32_t min_vm_size,
 	if (amdgpu_vm_block_size != -1)
 		tmp >>= amdgpu_vm_block_size - 9;
 	tmp = DIV_ROUND_UP(fls64(tmp) - 1, 9) - 1;
-	adev->vm_manager.num_level = min_t(unsigned int, max_level, tmp);
+	adev->vm_manager.num_level = min(max_level, tmp);
 	switch (adev->vm_manager.num_level) {
 	case 3:
 		adev->vm_manager.root_level = AMDGPU_VM_PDB2;
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 91c0188a29b2..0180675e76a4 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -6257,7 +6257,7 @@ convert_color_depth_from_display_info(const struct drm_connector *connector,
 		 * or if this was called outside of atomic check, so it
 		 * can't be used directly.
 		 */
-		bpc = min_t(u8, bpc, requested_bpc);
+		bpc = umin(bpc, requested_bpc);
 
 		/* Round down to the nearest even number. */
 		bpc = bpc - (bpc & 1);
-- 
2.39.5