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[PATCH] drm: etnaviv: constify etnaviv_iommu_ops structures

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  [PATCH] drm: etnaviv: constify etnaviv_iommu_ops structures Bhumika Goyal <bhumirks@gmail.com> - 2017-01-15 20:00 +0100
    Re: [PATCH] drm: etnaviv: constify etnaviv_iommu_ops structures Lucas Stach <l.stach@pengutronix.de> - 2017-01-16 10:40 +0100

#1559323 — [PATCH] drm: etnaviv: constify etnaviv_iommu_ops structures

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@p={...};

@ok1@
identifier r1.i;
position p;
struct etnaviv_iommu_domain x;
@@
x.domain.ops=&i@p.ops;

@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@gmail.com>
---
 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,
-- 
1.9.1

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#1559557

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@p={...};
> 
> @ok1@
> identifier r1.i;
> position p;
> struct etnaviv_iommu_domain x;
> @@
> x.domain.ops=&i@p.ops;
> 
> @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@gmail.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,

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