From: Arnd Bergmann <arnd@arndb.de>
To: David Airlie <airlied@linux.ie>
Cc: Arnd Bergmann <arnd@arndb.de>, Ben Skeggs <bskeggs@redhat.com>,
Samuel Pitoiset <samuel.pitoiset@gmail.com>,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH] nouveau: fix nv40_perfctr_next() cleanup regression
Date: Mon, 14 Mar 2016 15:24:10 +0100 [thread overview]
Message-ID: <1457965458-3319933-1-git-send-email-arnd@arndb.de> (raw)
gcc-6 warns about code in the nouveau driver that is obviously silly:
drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c: In function 'nv40_perfctr_next':
drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c:62:19: warning: self-comparison always evaluats to false [-Wtautological-compare]
if (pm->sequence != pm->sequence) {
The behavior was accidentally introduced in a patch described as "This is
purely preparation for upcoming commits, there should be no code changes here.".
As far as I can tell, that was true for the rest of that patch except for
this one function, which has been changed to a NOP.
This patch restores the original behavior.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 8c1aeaa13954 ("drm/nouveau/pm: cosmetic changes")
---
drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c b/drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c
index 4bef72a9d106..3fda594700e0 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c
@@ -59,9 +59,11 @@ static void
nv40_perfctr_next(struct nvkm_pm *pm, struct nvkm_perfdom *dom)
{
struct nvkm_device *device = pm->engine.subdev.device;
- if (pm->sequence != pm->sequence) {
+ struct nv40_pm *nv40pm = container_of(pm, struct nv40_pm, base);
+
+ if (nv40pm->sequence != pm->sequence) {
nvkm_wr32(device, 0x400084, 0x00000020);
- pm->sequence = pm->sequence;
+ nv40pm->sequence = pm->sequence;
}
}
--
2.7.0
next reply other threads:[~2016-03-14 14:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-14 14:24 Arnd Bergmann [this message]
2016-03-16 4:55 ` [PATCH] nouveau: fix nv40_perfctr_next() cleanup regression Ben Skeggs
2016-03-16 19:34 ` Samuel Pitoiset
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