linux-kernel - Re: [PATCH] drm: Remove redundant __GFP

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Message-ID: <69a17c463c6351b4e0ee03445f59b2d245e85e97@intel.com>
Date: Thu, 07 Aug 2025 17:13:07 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Qianfeng Rong <rongqianfeng@...o.com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Joonas Lahtinen
 <joonas.lahtinen@...ux.intel.com>, Rodrigo Vivi <rodrigo.vivi@...el.com>,
 Tvrtko Ursulin <tursulin@...ulin.net>, Qianfeng Rong
 <rongqianfeng@...o.com>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org
Subject: Re: [PATCH] drm: Remove redundant __GFP_NOWARN

On Thu, 07 Aug 2025, Qianfeng Rong <rongqianfeng@...o.com> wrote:
> Commit 16f5dfbc851b ("gfp: include __GFP_NOWARN in GFP_NOWAIT")
> made GFP_NOWAIT implicitly include __GFP_NOWARN.
>
> Therefore, explicit __GFP_NOWARN combined with GFP_NOWAIT
> (e.g., `GFP_NOWAIT | __GFP_NOWARN`) is now redundant. Let's clean
> up these redundant flags across subsystems.
>
> No functional changes.
>
> Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
> ---
>  drivers/gpu/drm/drm_modeset_lock.c               | 4 ++--

Please separate the drm core changes...

>  drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c | 4 ++--
>  drivers/gpu/drm/i915/i915_active.c               | 2 +-

...from the i915 driver changes.

Thanks,
Jani.

>  3 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
> index beb91a13a312..58eac20a8138 100644
> --- a/drivers/gpu/drm/drm_modeset_lock.c
> +++ b/drivers/gpu/drm/drm_modeset_lock.c
> @@ -88,7 +88,7 @@ static noinline depot_stack_handle_t __drm_stack_depot_save(void)
>  
>  	n = stack_trace_save(entries, ARRAY_SIZE(entries), 1);
>  
> -	return stack_depot_save(entries, n, GFP_NOWAIT | __GFP_NOWARN);
> +	return stack_depot_save(entries, n, GFP_NOWAIT);
>  }
>  
>  static void __drm_stack_depot_print(depot_stack_handle_t stack_depot)
> @@ -98,7 +98,7 @@ static void __drm_stack_depot_print(depot_stack_handle_t stack_depot)
>  	unsigned int nr_entries;
>  	char *buf;
>  
> -	buf = kmalloc(PAGE_SIZE, GFP_NOWAIT | __GFP_NOWARN);
> +	buf = kmalloc(PAGE_SIZE, GFP_NOWAIT);
>  	if (!buf)
>  		return;
>  
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
> index 8d4bb95f8424..22432912db2e 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
> +++ b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
> @@ -220,7 +220,7 @@ static void heartbeat(struct work_struct *wrk)
>  		goto out;
>  	}
>  
> -	rq = heartbeat_create(ce, GFP_NOWAIT | __GFP_NOWARN);
> +	rq = heartbeat_create(ce, GFP_NOWAIT);
>  	if (IS_ERR(rq))
>  		goto unlock;
>  
> @@ -282,7 +282,7 @@ static int __intel_engine_pulse(struct intel_engine_cs *engine)
>  	GEM_BUG_ON(!intel_engine_has_preemption(engine));
>  	GEM_BUG_ON(!intel_engine_pm_is_awake(engine));
>  
> -	rq = heartbeat_create(ce, GFP_NOWAIT | __GFP_NOWARN);
> +	rq = heartbeat_create(ce, GFP_NOWAIT);
>  	if (IS_ERR(rq))
>  		return PTR_ERR(rq);
>  
> diff --git a/drivers/gpu/drm/i915/i915_active.c b/drivers/gpu/drm/i915/i915_active.c
> index 0dbc4e289300..402043cd84d5 100644
> --- a/drivers/gpu/drm/i915/i915_active.c
> +++ b/drivers/gpu/drm/i915/i915_active.c
> @@ -727,7 +727,7 @@ int i915_request_await_active(struct i915_request *rq,
>  static int sw_await_fence(void *arg, struct dma_fence *fence)
>  {
>  	return i915_sw_fence_await_dma_fence(arg, fence, 0,
> -					     GFP_NOWAIT | __GFP_NOWARN);
> +					     GFP_NOWAIT);
>  }
>  
>  int i915_sw_fence_await_active(struct i915_sw_fence *fence,

-- 
Jani Nikula, Intel