linux-kernel - [PATCH 04/13] i915: use new sysctl subdir helper register_sysctl

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Message-Id: <20200529074108.16928-5-mcgrof@kernel.org>
Date:   Fri, 29 May 2020 07:40:59 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     keescook@...omium.org, yzaikin@...gle.com, nixiaoming@...wei.com,
        ebiederm@...ssion.com, axboe@...nel.dk, clemens@...isch.de,
        arnd@...db.de, gregkh@...uxfoundation.org,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, airlied@...ux.ie, daniel@...ll.ch,
        benh@...nel.crashing.org, rdna@...com, viro@...iv.linux.org.uk,
        mark@...heh.com, jlbec@...lplan.org, joseph.qi@...ux.alibaba.com,
        vbabka@...e.cz, sfr@...b.auug.org.au, jack@...e.cz,
        amir73il@...il.com, rafael@...nel.org, tytso@....edu
Cc:     julia.lawall@...6.fr, akpm@...ux-foundation.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linuxppc-dev@...ts.ozlabs.org, ocfs2-devel@....oracle.com,
        linux-kernel@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>
Subject: [PATCH 04/13] i915: use new sysctl subdir helper register_sysctl_subdir()

This simplifies the code considerably. The following coccinelle
SmPL grammar rule was used to transform this code.

// pycocci sysctl-subdir.cocci drivers/gpu/drm/i915/i915_perf.c

@c1@
expression E1;
identifier subdir, sysctls;
@@

static struct ctl_table subdir[] = {
	{
		.procname = E1,
		.maxlen = 0,
		.mode = 0555,
		.child = sysctls,
	},
	{ }
};

@c2@
identifier c1.subdir;

expression E2;
identifier base;
@@

static struct ctl_table base[] = {
	{
		.procname = E2,
		.maxlen = 0,
		.mode = 0555,
		.child = subdir,
	},
	{ }
};

@c3@
identifier c2.base;
identifier header;
@@

header = register_sysctl_table(base);

@r1 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.subdir, c1.sysctls;
@@

-static struct ctl_table subdir[] = {
-	{
-		.procname = E1,
-		.maxlen = 0,
-		.mode = 0555,
-		.child = sysctls,
-	},
-	{ }
-};

@r2 depends on c1 && c2 && c3@
identifier c1.subdir;

expression c2.E2;
identifier c2.base;
@@
-static struct ctl_table base[] = {
-	{
-		.procname = E2,
-		.maxlen = 0,
-		.mode = 0555,
-		.child = subdir,
-	},
-	{ }
-};

@r3 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.sysctls;
expression c2.E2;
identifier c2.base;
identifier c3.header;
@@

header =
-register_sysctl_table(base);
+register_sysctl_subdir(E2, E1, sysctls);

Generated-by: Coccinelle SmPL
Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 drivers/gpu/drm/i915/i915_perf.c | 22 +---------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 665bb076e84d..52509b573794 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -4203,26 +4203,6 @@ static struct ctl_table oa_table[] = {
 	{}
 };
 
-static struct ctl_table i915_root[] = {
-	{
-	 .procname = "i915",
-	 .maxlen = 0,
-	 .mode = 0555,
-	 .child = oa_table,
-	 },
-	{}
-};
-
-static struct ctl_table dev_root[] = {
-	{
-	 .procname = "dev",
-	 .maxlen = 0,
-	 .mode = 0555,
-	 .child = i915_root,
-	 },
-	{}
-};
-
 /**
  * i915_perf_init - initialize i915-perf state on module bind
  * @i915: i915 device instance
@@ -4383,7 +4363,7 @@ static int destroy_config(int id, void *p, void *data)
 
 void i915_perf_sysctl_register(void)
 {
-	sysctl_header = register_sysctl_table(dev_root);
+	sysctl_header = register_sysctl_subdir("dev", "i915", oa_table);
 }
 
 void i915_perf_sysctl_unregister(void)
-- 
2.26.2