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Message-Id: <20230928-jag-sysctl_remove_empty_elem_drivers-v1-6-e59120fca9f9@samsung.com>
Date:   Thu, 28 Sep 2023 15:21:31 +0200
From:   Joel Granados via B4 Relay 
        <devnull+j.granados.samsung.com@...nel.org>
To:     Luis Chamberlain <mcgrof@...nel.org>, willy@...radead.org,
        josh@...htriplett.org, Kees Cook <keescook@...omium.org>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Clemens Ladisch <clemens@...isch.de>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Doug Gilbert <dgilbert@...erlog.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Corey Minyard <minyard@....org>, Theodore Ts'o <tytso@....edu>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        David Ahern <dsahern@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Robin Holt <robinmholt@...il.com>,
        Steve Wahl <steve.wahl@....com>,
        Russ Weight <russell.h.weight@...el.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Song Liu <song@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-serial@...r.kernel.org, linux-scsi@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-rdma@...r.kernel.org,
        openipmi-developer@...ts.sourceforge.net, netdev@...r.kernel.org,
        linux-raid@...r.kernel.org, linux-hyperv@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        Joel Granados <j.granados@...sung.com>
Subject: [PATCH 06/15] parport: Remove the now superfluous sentinel element
 from ctl_table array

From: Joel Granados <j.granados@...sung.com>

This commit comes at the tail end of a greater effort to remove the
empty elements at the end of the ctl_table arrays (sentinels) which
will reduce the overall build time size of the kernel and run time
memory bloat by ~64 bytes per sentinel (further information Link :
https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/)

Remove the unneeded ctl_tables that were used to register intermediate
parport directories; only the path is needed at this point. From
parport_device_sysctl_table we removed: devices_root_dir, port_dir,
parport_dir and dev_dir. From parport_default_sysctl_table we removed:
default_dir, parport_dir and dev_dir. Reduce the size by one of the
ctl_table arrays that were not removed

Assign different sizes to the vars array in parport_sysctl_table
depending on CONFIG_PARPORT_1284; this is necessary now that the sysctl
register function uses ARRAY_SIZE to calculate the elements within.
Remove the sentinel element from parport_sysctl_template,
parport_device_sysctl_table and parport_default_sysctl_table.

Signed-off-by: Joel Granados <j.granados@...sung.com>
---
 drivers/parport/procfs.c | 42 ++++++++++++++++++------------------------
 1 file changed, 18 insertions(+), 24 deletions(-)

diff --git a/drivers/parport/procfs.c b/drivers/parport/procfs.c
index 4e5b972c3e26..4118b3e52223 100644
--- a/drivers/parport/procfs.c
+++ b/drivers/parport/procfs.c
@@ -259,8 +259,12 @@ PARPORT_MAX_SPINTIME_VALUE;
 struct parport_sysctl_table {
 	struct ctl_table_header *port_header;
 	struct ctl_table_header *devices_header;
-	struct ctl_table vars[12];
-	struct ctl_table device_dir[2];
+#ifdef CONFIG_PARPORT_1284
+	struct ctl_table vars[10];
+#else
+	struct ctl_table vars[5];
+#endif /* IEEE 1284 support */
+	struct ctl_table device_dir[1];
 };
 
 static const struct parport_sysctl_table parport_sysctl_template = {
@@ -303,9 +307,9 @@ static const struct parport_sysctl_table parport_sysctl_template = {
 			.maxlen		= 0,
 			.mode		= 0444,
 			.proc_handler	= do_hardware_modes
-		},
+		}
 #ifdef CONFIG_PARPORT_1284
-		{
+		, {
 			.procname	= "autoprobe",
 			.data		= NULL,
 			.maxlen		= 0,
@@ -339,9 +343,8 @@ static const struct parport_sysctl_table parport_sysctl_template = {
 			.maxlen		= 0,
 			.mode		= 0444,
 			.proc_handler	= do_autoprobe
-		},
+		}
 #endif /* IEEE 1284 support */
-		{}
 	},
 	{
 		{
@@ -350,20 +353,15 @@ static const struct parport_sysctl_table parport_sysctl_template = {
 			.maxlen		= 0,
 			.mode		= 0444,
 			.proc_handler	= do_active_device
-		},
-		{}
+		}
 	},
 };
 
 struct parport_device_sysctl_table
 {
 	struct ctl_table_header *sysctl_header;
-	struct ctl_table vars[2];
-	struct ctl_table device_dir[2];
-	struct ctl_table devices_root_dir[2];
-	struct ctl_table port_dir[2];
-	struct ctl_table parport_dir[2];
-	struct ctl_table dev_dir[2];
+	struct ctl_table vars[1];
+	struct ctl_table device_dir[1];
 };
 
 static const struct parport_device_sysctl_table
@@ -378,8 +376,7 @@ parport_device_sysctl_template = {
 			.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
 			.extra1		= (void*) &parport_min_timeslice_value,
 			.extra2		= (void*) &parport_max_timeslice_value
-		},
-		{}
+		}
 	},
 	{
 		{
@@ -387,18 +384,14 @@ parport_device_sysctl_template = {
 			.data		= NULL,
 			.maxlen		= 0,
 			.mode		= 0555,
-		},
-		{}
+		}
 	}
 };
 
 struct parport_default_sysctl_table
 {
 	struct ctl_table_header *sysctl_header;
-	struct ctl_table vars[3];
-	struct ctl_table default_dir[2];
-	struct ctl_table parport_dir[2];
-	struct ctl_table dev_dir[2];
+	struct ctl_table vars[2];
 };
 
 static struct parport_default_sysctl_table
@@ -422,8 +415,7 @@ parport_default_sysctl_table = {
 			.proc_handler	= proc_dointvec_minmax,
 			.extra1		= (void*) &parport_min_spintime_value,
 			.extra2		= (void*) &parport_max_spintime_value
-		},
-		{}
+		}
 	}
 };
 
@@ -443,7 +435,9 @@ int parport_proc_register(struct parport *port)
 	t->vars[0].data = &port->spintime;
 	for (i = 0; i < 5; i++) {
 		t->vars[i].extra1 = port;
+#ifdef CONFIG_PARPORT_1284
 		t->vars[5 + i].extra2 = &port->probe_info[i];
+#endif /* IEEE 1284 support */
 	}
 
 	port_name_len = strnlen(port->name, PARPORT_NAME_MAX_LEN);

-- 
2.30.2

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