linux-kernel - [PATCH 03/10] drm: use idr_init_base() to initialize master->magic

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Date:   Fri,  1 Jul 2022 20:52:56 +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 03/10] drm: use idr_init_base() to initialize master->magic_map

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/allocated, using
idr_init_base(&idr, 1) avoids unnecessary tree walks.

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

diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
index 6e433d465f41..63395bebaa6b 100644
--- a/drivers/gpu/drm/drm_auth.c
+++ b/drivers/gpu/drm/drm_auth.c
@@ -140,7 +140,7 @@ struct drm_master *drm_master_create(struct drm_device *dev)
 
 	kref_init(&master->refcount);
 	drm_master_legacy_init(master);
-	idr_init(&master->magic_map);
+	idr_init_base(&master->magic_map, 1);
 	master->dev = dev;
 
 	/* initialize the tree of output resource lessees */
-- 
2.36.1