linux-kernel - RE: [PATCH] drm/nouveau/secboot: remove VLA usage

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Message-ID: <6977788dfbac4b70b54fd56310cc27fe@AcuMS.aculab.com>
Date:   Tue, 13 Mar 2018 16:10:03 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     "'Gustavo A. R. Silva'" <gustavo@...eddedor.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] drm/nouveau/secboot: remove VLA usage

From: Gustavo A. R. Silva
> Sent: 13 March 2018 14:48
> In preparation to enabling -Wvla, remove VLA. In this particular
> case directly use macro NVKM_MSGQUEUE_CMDLINE_SIZE instead of local
> variable cmdline_size. Also, remove cmdline_size as it is not
> actually useful anymore.
...
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/ls_ucode_msgqueue.c
> b/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/ls_ucode_msgqueue.c
> index 6f10b09..2da147b 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/ls_ucode_msgqueue.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/ls_ucode_msgqueue.c
> @@ -80,12 +80,12 @@ acr_ls_msgqueue_post_run(struct nvkm_msgqueue *queue,
>  			 struct nvkm_falcon *falcon, u32 addr_args)
>  {
>  	struct nvkm_device *device = falcon->owner->device;
> -	u32 cmdline_size = NVKM_MSGQUEUE_CMDLINE_SIZE;
> -	u8 buf[cmdline_size];
> +	u8 buf[NVKM_MSGQUEUE_CMDLINE_SIZE];
> 
> -	memset(buf, 0, cmdline_size);
> +	memset(buf, 0, NVKM_MSGQUEUE_CMDLINE_SIZE);
>  	nvkm_msgqueue_write_cmdline(queue, buf);
> -	nvkm_falcon_load_dmem(falcon, buf, addr_args, cmdline_size, 0);
> +	nvkm_falcon_load_dmem(falcon, buf, addr_args,
> +			      NVKM_MSGQUEUE_CMDLINE_SIZE, 0);

I think I'd use 'sizeof (buf)' in both those lines.

	David