linux-kernel - [PATCH 01/10] drm/amdgpu: use idr_init_base() to initialize mgr->ctx

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Date:   Fri,  1 Jul 2022 20:52:54 +0200
From:   dakr@...hat.com
To:     airlied@...ux.ie, daniel@...ll.ch, christian.koenig@....com,
        emma@...olt.net
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Danilo Krummrich <dakr@...hat.com>
Subject: [PATCH 01/10] drm/amdgpu: use idr_init_base() to initialize mgr->ctx_handles

From: Danilo Krummrich <dakr@...hat.com>

idr_init_base(), implemented by commit 6ce711f27500 ("idr: Make 1-based
IDRs more efficient"), let us set an arbitrary base other than
idr_init(), which uses base 0.

Since, for this IDR, no ID < 1 is ever requested, using
idr_init_base(&idr, 1) avoids unnecessary tree walks.

Signed-off-by: Danilo Krummrich <dakr@...hat.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
index 7dc92ef36b2b..cc87c3809a8d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -841,7 +841,7 @@ void amdgpu_ctx_mgr_init(struct amdgpu_ctx_mgr *mgr,
 
 	mgr->adev = adev;
 	mutex_init(&mgr->lock);
-	idr_init(&mgr->ctx_handles);
+	idr_init_base(&mgr->ctx_handles, 1);
 
 	for (i = 0; i < AMDGPU_HW_IP_NUM; ++i)
 		atomic64_set(&mgr->time_spend[i], 0);
-- 
2.36.1