linux-kernel - Re: [PATCH] drm: etnaviv: constify etnaviv_iommu

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Message-ID: <1484559248.30810.71.camel@pengutronix.de>
Date:   Mon, 16 Jan 2017 10:34:08 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Bhumika Goyal <bhumirks@...il.com>
Cc:     julia.lawall@...6.fr, etnaviv@...linux.org.uk,
        christian.gmeiner@...il.com, airlied@...ux.ie,
        etnaviv@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: etnaviv: constify etnaviv_iommu_ops structures

Am Montag, den 16.01.2017, 00:20 +0530 schrieb Bhumika Goyal:
> Declare etnaviv_iommu_ops structure as const as it is only used when
> the reference of one of its field is stored in the ops field of a
> iommu_domain structure. This ops field is of type const, so 
> etnaviv_iommu_ops structures having similar properties can be declared 
> const too.
> Done using Coccinelle:
> 
> @r1 disable optional_qualifier@
> identifier i;
> position p;
> @@
> static struct etnaviv_iommu_ops i@......};
> 
> @ok1@
> identifier r1.i;
> position p;
> struct etnaviv_iommu_domain x;
> @@
> x.domain.ops=&i@...ps;
> 
> @bad@
> position p!={r1.p,ok1.p};
> identifier r1.i;
> @@
> i@p
> 
> @depends on !bad disable optional_qualifier@
> identifier r1.i;
> @@
> +const
> struct etnaviv_iommu_ops i;
> 
> Before and after size details of .o file remains the same after 
> cross compiling for arm architecture.
> 
> Signed-off-by: Bhumika Goyal <bhumirks@...il.com>

Thanks, I've applied this patch to my tree.

> ---
>  drivers/gpu/drm/etnaviv/etnaviv_iommu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_iommu.c b/drivers/gpu/drm/etnaviv/etnaviv_iommu.c
> index 81f1583..7a7c97f 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_iommu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_iommu.c
> @@ -184,7 +184,7 @@ static void etnaviv_iommuv1_dump(struct iommu_domain *domain, void *buf)
>  	memcpy(buf, etnaviv_domain->pgtable.pgtable, PT_SIZE);
>  }
>  
> -static struct etnaviv_iommu_ops etnaviv_iommu_ops = {
> +static const struct etnaviv_iommu_ops etnaviv_iommu_ops = {
>  	.ops = {
>  		.domain_free = etnaviv_domain_free,
>  		.map = etnaviv_iommuv1_map,