From: Gou Hao <gouhao@uniontech.com>
To: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com,
chleroy@kernel.org, maarten.lankhorst@linux.intel.com,
mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com,
simona@ffwll.ch, bharat@chelsio.com, jgg@ziepe.ca,
leon@kernel.org, akpm@linux-foundation.org, gouhao@uniontech.com,
namcao@linutronix.de, ynorov@nvidia.com, sshegde@linux.ibm.com,
nilay@linux.ibm.com, clg@kaod.org
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org,
linux-mm@kvack.org, gouhaojake@163.com, kernel@uniontech.com
Subject: [PATCH v2 4/6] drm: remove dead WARN_ON NULL check after GFP_NOFAIL allocation
Date: Fri, 24 Jul 2026 10:28:49 +0800 [thread overview]
Message-ID: <20260724022851.466017-5-gouhao@uniontech.com> (raw)
In-Reply-To: <20260724022851.466017-1-gouhao@uniontech.com>
kzalloc_obj with the __GFP_NOFAIL flag will never return NULL, so the
subsequent WARN_ON(!ctx) is unreachable dead code. Remove it.
Signed-off-by: Gou Hao <gouhao@uniontech.com>
---
drivers/gpu/drm/drm_modeset_lock.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
index 2c806b0146d67..e14814c30d8c0 100644
--- a/drivers/gpu/drm/drm_modeset_lock.c
+++ b/drivers/gpu/drm/drm_modeset_lock.c
@@ -149,11 +149,7 @@ void drm_modeset_lock_all(struct drm_device *dev)
int ret;
ctx = kzalloc_obj(*ctx, GFP_KERNEL | __GFP_NOFAIL);
- if (WARN_ON(!ctx))
- return;
-
mutex_lock(&config->mutex);
-
drm_modeset_acquire_init(ctx, 0);
retry:
--
2.20.1
next prev parent reply other threads:[~2026-07-24 2:29 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-24 2:28 [PATCH v2 0/6] remove dead NULL checks after GFP_NOFAIL allocations and fix xive use-after-free Gou Hao
2026-07-24 2:28 ` [PATCH v2 1/6] powerpc/xive: remove dead NULL check after GFP_NOFAIL allocation Gou Hao
2026-07-24 2:28 ` [PATCH v2 2/6] powerpc/xive: add error return value to xive_smp_probe() Gou Hao
2026-07-24 2:28 ` [PATCH v2 3/6] powerpc/xive: fix use-after-free of xive_ipis Gou Hao
2026-07-24 2:28 ` Gou Hao [this message]
2026-07-24 2:28 ` [PATCH v2 5/6] lib/test_hmm: remove dead NULL checks after GFP_NOFAIL allocations Gou Hao
2026-07-24 2:28 ` [PATCH v2 6/6] RDMA/cxgb4: " Gou Hao
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