linux-kernel - [PATCH] drm/sun4i: constify component

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Date:   Sat, 12 Nov 2016 18:19:58 +0100
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     kernel-janitors@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Chen-Yu Tsai <wens@...e.org>, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Bhumika Goyal <bhumirks@...il.com>
Subject: [PATCH] drm/sun4i: constify component_ops structures

These component_ops structures are only used as the second argument to
component_add and component_del, which are declared as const, so the
structures can be declared as const as well.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@

static struct component_ops i@p = { ... };

@ok1@
identifier r.i;
expression e1;
position p;
@@

component_add(e1,&i@p)

@ok2@
identifier r.i;
expression e1;
position p;
@@

component_del(e1, &i@p)

@bad@
position p != {r.p,ok1.p,ok2.p};
identifier r.i;
struct component_ops e;
@@

e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@

static
+const
 struct component_ops i = { ... };
// </smpl>

The result of the size command before the change is (arm):

   text       data         bss     dec      hex filename
   5266        236           8    5510     1586 sun4i_backend.o
   6393        236           8    6637     19ed sun4i_tcon.o
   3700        368           8    4076      fec sun4i_tv.o
   1668        108           0    1776      6f0 sun6i_drc.o

and after the change:

   text       data         bss     dec     hex filename
   5274        228           8    5510    1586 sun4i_backend.o
   6401        228           8    6637    19ed sun4i_tcon.o
   3708        360           8    4076     fec sun4i_tv.o
   1676        100           0    1776     6f0 sun6i_drc.o

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/gpu/drm/sun4i/sun4i_backend.c |    2 +-
 drivers/gpu/drm/sun4i/sun4i_tcon.c    |    2 +-
 drivers/gpu/drm/sun4i/sun4i_tv.c      |    2 +-
 drivers/gpu/drm/sun4i/sun6i_drc.c     |    2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
index 7eb2a96..2e08f96 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
@@ -409,7 +409,7 @@ static void sun4i_backend_unbind(struct device *dev, struct device *master,
 	reset_control_assert(backend->reset);
 }
 
-static struct component_ops sun4i_backend_ops = {
+static const struct component_ops sun4i_backend_ops = {
 	.bind	= sun4i_backend_bind,
 	.unbind	= sun4i_backend_unbind,
 };
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index c6afb24..ea2906f 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -545,7 +545,7 @@ static void sun4i_tcon_unbind(struct device *dev, struct device *master,
 	sun4i_tcon_free_clocks(tcon);
 }
 
-static struct component_ops sun4i_tcon_ops = {
+static const struct component_ops sun4i_tcon_ops = {
 	.bind	= sun4i_tcon_bind,
 	.unbind	= sun4i_tcon_unbind,
 };
diff --git a/drivers/gpu/drm/sun4i/sun4i_tv.c b/drivers/gpu/drm/sun4i/sun4i_tv.c
index 1dd3d9e..d430b331 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tv.c
@@ -667,7 +667,7 @@ static void sun4i_tv_unbind(struct device *dev, struct device *master,
 	clk_disable_unprepare(tv->clk);
 }
 
-static struct component_ops sun4i_tv_ops = {
+static const struct component_ops sun4i_tv_ops = {
 	.bind	= sun4i_tv_bind,
 	.unbind	= sun4i_tv_unbind,
 };
diff --git a/drivers/gpu/drm/sun4i/sun6i_drc.c b/drivers/gpu/drm/sun4i/sun6i_drc.c
index 6ef707c..09bba85 100644
--- a/drivers/gpu/drm/sun4i/sun6i_drc.c
+++ b/drivers/gpu/drm/sun4i/sun6i_drc.c
@@ -80,7 +80,7 @@ static void sun6i_drc_unbind(struct device *dev, struct device *master,
 	reset_control_assert(drc->reset);
 }
 
-static struct component_ops sun6i_drc_ops = {
+static const struct component_ops sun6i_drc_ops = {
 	.bind	= sun6i_drc_bind,
 	.unbind	= sun6i_drc_unbind,
 };