[PATCH 04/13] i915: use new sysctl subdir helper register_sysctl_subdir()

[Luis Chamberlain]

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 <mcg...@kernel.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

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