linux-kernel - [PATCH 07/10] drm/sis: use idr_init_base() to initialize dev_priv->object

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Message-Id: <20220701185303.284082-8-dakr@redhat.com>
Date:   Fri,  1 Jul 2022 20:53:00 +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 07/10] drm/sis: use idr_init_base() to initialize dev_priv->object_idr

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/sis/sis_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sis/sis_drv.c b/drivers/gpu/drm/sis/sis_drv.c
index e35e719cf315..6173020a9bf5 100644
--- a/drivers/gpu/drm/sis/sis_drv.c
+++ b/drivers/gpu/drm/sis/sis_drv.c
@@ -50,7 +50,7 @@ static int sis_driver_load(struct drm_device *dev, unsigned long chipset)
 	if (dev_priv == NULL)
 		return -ENOMEM;
 
-	idr_init(&dev_priv->object_idr);
+	idr_init_base(&dev_priv->object_idr, 1);
 	dev->dev_private = (void *)dev_priv;
 	dev_priv->chipset = chipset;
 
-- 
2.36.1