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From: Deepak R Varma <mh12gx2825@gmail.com>
To: Eric Anholt <eric@anholt.net>, David Airlie <airlied@linux.ie>,
	Daniel Vetter <daniel@ffwll.ch>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Cc: mh12gx2825@gmail.com, Maxime Ripard <mripard@kernel.org>,
	Maxime Ripard <maxime@cerno.tech>
Subject: [PATCH v2] drm/vc4: replace idr_init() by idr_init_base()
Date: Fri, 6 Nov 2020 01:51:35 +0530	[thread overview]
Message-ID: <20201105202135.GA145111@localhost> (raw)

idr_init() uses base 0 which is an invalid identifier for this driver.
The idr_alloc for this driver uses VC4_PERFMONID_MIN as start value for
ID range and it is #defined to 1. 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 / available.

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

Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
---
Changes since v1:
   - Change suggested by Eric Anholt
     1. Use VC4_PERFMONID_MIN instead of magic number 1

 drivers/gpu/drm/vc4/vc4_perfmon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_perfmon.c b/drivers/gpu/drm/vc4/vc4_perfmon.c
index f4aa75efd16b..18abc06335c1 100644
--- a/drivers/gpu/drm/vc4/vc4_perfmon.c
+++ b/drivers/gpu/drm/vc4/vc4_perfmon.c
@@ -77,7 +77,7 @@ struct vc4_perfmon *vc4_perfmon_find(struct vc4_file *vc4file, int id)
 void vc4_perfmon_open_file(struct vc4_file *vc4file)
 {
 	mutex_init(&vc4file->perfmon.lock);
-	idr_init(&vc4file->perfmon.idr);
+	idr_init_base(&vc4file->perfmon.idr, VC4_PERFMONID_MIN);
 }
 
 static int vc4_perfmon_idr_del(int id, void *elem, void *data)
-- 
2.25.1


WARNING: multiple messages have this Message-ID (diff)
From: Deepak R Varma <mh12gx2825@gmail.com>
To: Eric Anholt <eric@anholt.net>, David Airlie <airlied@linux.ie>,
	Daniel Vetter <daniel@ffwll.ch>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Cc: mh12gx2825@gmail.com, Maxime Ripard <maxime@cerno.tech>
Subject: [PATCH v2] drm/vc4: replace idr_init() by idr_init_base()
Date: Fri, 6 Nov 2020 01:51:35 +0530	[thread overview]
Message-ID: <20201105202135.GA145111@localhost> (raw)

idr_init() uses base 0 which is an invalid identifier for this driver.
The idr_alloc for this driver uses VC4_PERFMONID_MIN as start value for
ID range and it is #defined to 1. 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 / available.

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

Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
---
Changes since v1:
   - Change suggested by Eric Anholt
     1. Use VC4_PERFMONID_MIN instead of magic number 1

 drivers/gpu/drm/vc4/vc4_perfmon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_perfmon.c b/drivers/gpu/drm/vc4/vc4_perfmon.c
index f4aa75efd16b..18abc06335c1 100644
--- a/drivers/gpu/drm/vc4/vc4_perfmon.c
+++ b/drivers/gpu/drm/vc4/vc4_perfmon.c
@@ -77,7 +77,7 @@ struct vc4_perfmon *vc4_perfmon_find(struct vc4_file *vc4file, int id)
 void vc4_perfmon_open_file(struct vc4_file *vc4file)
 {
 	mutex_init(&vc4file->perfmon.lock);
-	idr_init(&vc4file->perfmon.idr);
+	idr_init_base(&vc4file->perfmon.idr, VC4_PERFMONID_MIN);
 }
 
 static int vc4_perfmon_idr_del(int id, void *elem, void *data)
-- 
2.25.1

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             reply	other threads:[~2020-11-05 20:21 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-05 20:21 Deepak R Varma [this message]
2020-11-05 20:21 ` [PATCH v2] drm/vc4: replace idr_init() by idr_init_base() Deepak R Varma
2020-11-05 21:24 ` Eric Anholt
2020-11-05 21:24   ` Eric Anholt
2020-11-06 10:52   ` Maxime Ripard
2020-11-06 10:52     ` Maxime Ripard
2020-11-08 10:13     ` Deepak R Varma
2020-11-08 10:13       ` Deepak R Varma

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