Subject: [PATCH 03/13] hpet: use new sysctl subdir helper register_sysctl_subdir()

From: Luis Chamberlain <[email-masked]>
Date: Fri, 29 May 2020 07:40:58 +0000

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

// pycocci sysctl-subdir.cocci drivers/char/hpet.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 <[email-masked]>
---
 drivers/char/hpet.c | 22 +---------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index ed3b7dab678d..169c970d5ff8 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -746,26 +746,6 @@ static struct ctl_table hpet_table[] = {
 	{}
 };
 
-static struct ctl_table hpet_root[] = {
-	{
-	 .procname = "hpet",
-	 .maxlen = 0,
-	 .mode = 0555,
-	 .child = hpet_table,
-	 },
-	{}
-};
-
-static struct ctl_table dev_root[] = {
-	{
-	 .procname = "dev",
-	 .maxlen = 0,
-	 .mode = 0555,
-	 .child = hpet_root,
-	 },
-	{}
-};
-
 static struct ctl_table_header *sysctl_header;
 
 /*
@@ -1059,7 +1039,7 @@ static int __init hpet_init(void)
 	if (result < 0)
 		return -ENODEV;
 
-	sysctl_header = register_sysctl_table(dev_root);
+	sysctl_header = register_sysctl_subdir("dev", "hpet", hpet_table);
 
 	result = acpi_bus_register_driver(&hpet_acpi_driver);
 	if (result < 0) {
-- 
2.26.2