[PATCH v2 5/8] test_sysctl: simplify subdirectory registration with register_sysctl()

[Luis Chamberlain]

There is no need to user boiler plate code to specify a set of base
directories we're going to stuff sysctls under. Simplify this by using
register_sysctl() and specifying the directory path directly.

// pycocci sysctl-subdir-register-sysctl-simplify.cocci lib/test_sysctl.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,
-       },
-       { }
-};

@initialize:python@
@@

def make_my_fresh_expression(s1, s2):
  return '"' + s1.strip('"') + "/" + s2.strip('"') + '"'

@r3 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.sysctls;
expression c2.E2;
identifier c2.base;
identifier c3.header;
fresh identifier E3 = script:python(E2, E1) { make_my_fresh_expression(E2, E1) 
};
@@

header =
-register_sysctl_table(base);
+register_sysctl(E3, sysctls);

Generated-by: Coccinelle SmPL
Signed-off-by: Luis Chamberlain <mcg...@kernel.org>
---
 lib/test_sysctl.c | 22 +---------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

diff --git a/lib/test_sysctl.c b/lib/test_sysctl.c
index 3750323973f4..a5a3d6c27e1f 100644
--- a/lib/test_sysctl.c
+++ b/lib/test_sysctl.c
@@ -128,26 +128,6 @@ static struct ctl_table test_table[] = {
        { }
 };
 
-static struct ctl_table test_sysctl_table[] = {
-       {
-               .procname       = "test_sysctl",
-               .maxlen         = 0,
-               .mode           = 0555,
-               .child          = test_table,
-       },
-       { }
-};
-
-static struct ctl_table test_sysctl_root_table[] = {
-       {
-               .procname       = "debug",
-               .maxlen         = 0,
-               .mode           = 0555,
-               .child          = test_sysctl_table,
-       },
-       { }
-};
-
 static struct ctl_table_header *test_sysctl_header;
 
 static int __init test_sysctl_init(void)
@@ -155,7 +135,7 @@ static int __init test_sysctl_init(void)
        test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
        if (!test_data.bitmap_0001)
                return -ENOMEM;
-       test_sysctl_header = register_sysctl_table(test_sysctl_root_table);
+       test_sysctl_header = register_sysctl("debug/test_sysctl", test_table);
        if (!test_sysctl_header) {
                kfree(test_data.bitmap_0001);
                return -ENOMEM;
-- 
2.33.0