linux-kernel - Re: [PATCH 4/9] drm/i915/gvt: Constify intel_gvt_sched_policy

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Message-ID: <7b933053-5275-9d97-d667-8688e3a0cccb@intel.com>
Date:   Fri, 10 Dec 2021 08:11:56 +0000
From:   "Wang, Zhi A" <zhi.a.wang@...el.com>
To:     Rikard Falkeborn <rikard.falkeborn@...il.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        "Joonas Lahtinen" <joonas.lahtinen@...ux.intel.com>,
        "Vivi, Rodrigo" <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
CC:     "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/9] drm/i915/gvt: Constify intel_gvt_sched_policy_ops

On 12/4/2021 12:55 PM, Rikard Falkeborn wrote:
> These are never modified, so make them const to allow the compiler to
> put them in read-only memory.
>
> Signed-off-by: Rikard Falkeborn <rikard.falkeborn@...il.com>
> ---
>   drivers/gpu/drm/i915/gvt/sched_policy.c | 2 +-
>   drivers/gpu/drm/i915/gvt/scheduler.h    | 2 +-
>   2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gvt/sched_policy.c b/drivers/gpu/drm/i915/gvt/sched_policy.c
> index 036b74fe9298..c077fb4674f0 100644
> --- a/drivers/gpu/drm/i915/gvt/sched_policy.c
> +++ b/drivers/gpu/drm/i915/gvt/sched_policy.c
> @@ -368,7 +368,7 @@ static void tbs_sched_stop_schedule(struct intel_vgpu *vgpu)
>   	vgpu_data->active = false;
>   }
>   
> -static struct intel_gvt_sched_policy_ops tbs_schedule_ops = {
> +static const struct intel_gvt_sched_policy_ops tbs_schedule_ops = {
>   	.init = tbs_sched_init,
>   	.clean = tbs_sched_clean,
>   	.init_vgpu = tbs_sched_init_vgpu,
> diff --git a/drivers/gpu/drm/i915/gvt/scheduler.h b/drivers/gpu/drm/i915/gvt/scheduler.h
> index 7c86984a842f..1f391b3da2cc 100644
> --- a/drivers/gpu/drm/i915/gvt/scheduler.h
> +++ b/drivers/gpu/drm/i915/gvt/scheduler.h
> @@ -56,7 +56,7 @@ struct intel_gvt_workload_scheduler {
>   	wait_queue_head_t waitq[I915_NUM_ENGINES];
>   
>   	void *sched_data;
> -	struct intel_gvt_sched_policy_ops *sched_ops;
> +	const struct intel_gvt_sched_policy_ops *sched_ops;
>   };
>   
>   #define INDIRECT_CTX_ADDR_MASK 0xffffffc0

Reviewed-by: Zhi Wang <zhi.a.wang@...el.com>