linux-kernel - [PATCH] drm/amdkfd: simplify svm_range_unmap_from

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Message-ID: <20260114160512.831773-1-ynorov@nvidia.com>
Date: Wed, 14 Jan 2026 11:05:10 -0500
From: Yury Norov <ynorov@...dia.com>
To: Felix Kuehling <Felix.Kuehling@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: Yury Norov <ynorov@...dia.com>
Subject: [PATCH] drm/amdkfd: simplify svm_range_unmap_from_gpus()

The function calls bitmap_or() followed by for_each_set_bit().
Switch it to the dedicated for_each_or_bit() and drop the temporary
bitmap.

Signed-off-by: Yury Norov <ynorov@...dia.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 79ea138897fc..eed76b13d191 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1344,7 +1344,6 @@ static int
 svm_range_unmap_from_gpus(struct svm_range *prange, unsigned long start,
 			  unsigned long last, uint32_t trigger)
 {
-	DECLARE_BITMAP(bitmap, MAX_GPU_INSTANCE);
 	struct kfd_process_device *pdd;
 	struct dma_fence *fence = NULL;
 	struct kfd_process *p;
@@ -1362,11 +1361,9 @@ svm_range_unmap_from_gpus(struct svm_range *prange, unsigned long start,
 		prange->mapped_to_gpu = false;
 	}
 
-	bitmap_or(bitmap, prange->bitmap_access, prange->bitmap_aip,
-		  MAX_GPU_INSTANCE);
 	p = container_of(prange->svms, struct kfd_process, svms);
 
-	for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) {
+	for_each_or_bit(gpuidx, prange->bitmap_access, prange->bitmap_aip, MAX_GPU_INSTANCE) {
 		pr_debug("unmap from gpu idx 0x%x\n", gpuidx);
 		pdd = kfd_process_device_from_gpuidx(p, gpuidx);
 		if (!pdd) {
-- 
2.43.0