Re: [PATCH] drm/amdgpu: replace idr_init() by idr_init_base()

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Am 04.11.20 um 16:16 schrieb Deepak R Varma:
idr_init() uses base 0 which is an invalid identifier. The new function
idr_init_base allows IDR to set the ID lookup from base 1. This avoids
all lookups that otherwise starts from 0 since 0 is always unused.

References: commit 6ce711f27500 ("idr: Make 1-based IDRs more efficient")

Signed-off-by: Deepak R Varma <mh12gx2825@xxxxxxxxx>

Reviewed-by: Christian König <christian.koenig@xxxxxxx>

---
  drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 2 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 2 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c  | 2 +-
  3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
index c80d8339f58c..b98ae173a9de 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -576,7 +576,7 @@ int amdgpu_ctx_wait_prev_fence(struct amdgpu_ctx *ctx,
  void amdgpu_ctx_mgr_init(struct amdgpu_ctx_mgr *mgr)
  {
  	mutex_init(&mgr->lock);
-	idr_init(&mgr->ctx_handles);
+	idr_init_base(&mgr->ctx_handles, 1);
  }
long amdgpu_ctx_mgr_entity_flush(struct amdgpu_ctx_mgr *mgr, long timeout)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index efda38349a03..d65a1888683b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -1052,7 +1052,7 @@ int amdgpu_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv)
  	}
mutex_init(&fpriv->bo_list_lock);
-	idr_init(&fpriv->bo_list_handles);
+	idr_init_base(&fpriv->bo_list_handles, 1);
amdgpu_ctx_mgr_init(&fpriv->ctx_mgr); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index df110afa97bf..0154282771c7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -3199,7 +3199,7 @@ void amdgpu_vm_manager_init(struct amdgpu_device *adev)
  	adev->vm_manager.vm_update_mode = 0;
  #endif
- idr_init(&adev->vm_manager.pasid_idr);
+	idr_init_base(&adev->vm_manager.pasid_idr, 1);
  	spin_lock_init(&adev->vm_manager.pasid_lock);
  }

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