Re: [PATCH v2 2/8] i915: simplify subdirectory registration with register_sysctl()

Jani Nikula
2021-11-25T09:43:47Z

On Tue, 23 Nov 2021, Luis Chamberlain <mcgrof@kernel.org> wrote:
> 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.

\o/

Acked-by: Jani Nikula <jani.nikula@intel.com>

>
> // pycocci sysctl-subdir-register-sysctl-simplify.cocci PATH
>
> @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 <mcgrof@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 2f01b8c0284c..5979e3258647 100644
> --- a/drivers/gpu/drm/i915/i915_perf.c
> +++ b/drivers/gpu/drm/i915/i915_perf.c
> @@ -4273,26 +4273,6 @@ 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,
> - },
> - {}
> -};
> -
> static void oa_init_supported_formats(struct i915_perf *perf)
> {
> struct drm_i915_private *i915 = perf->i915;
> @@ -4488,7 +4468,7 @@ static int destroy_config(int id, void *p, void *data)
>
> int i915_perf_sysctl_register(void)
> {
> - sysctl_header = register_sysctl_table(dev_root);
> + sysctl_header = register_sysctl("dev/i915", oa_table);
> return 0;
> }

--
Jani Nikula, Intel Open Source Graphics Center