sysctl: remove CONFIG_PROC_SYSCTL, it just mirrors CONFIG_SYSCTL

CONFIG_SYSCTL used to make sense as a separate hidden bool before commit
61a47c1ad3 ("sysctl: Remove the sysctl system call"); it was selected by
both CONFIG_SYSCTL_SYSCALL and CONFIG_PROC_SYSCTL.

Today CONFIG_PROC_SYSCTL is the only selector, so the two are always
equal.  Kill the hidden bool, rename the PROC_SYSCTL prompt to SYSCTL, and
s/CONFIG_PROC_SYSCTL/CONFIG_SYSCTL/ tree-wide.

Link: https://lore.kernel.org/amdveg1m4E4uQlGv@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Alexey Gladkov (Intel) <legion@kernel.org>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: "Borislav Petkov (AMD)" <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jakub Kacinski <kuba@kernel.org>
Cc: Jason A. Donenfeld <jason@zx2c4.com>
Cc: Joel Granados <joel.granados@kernel.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/m68k/configs/amcore_defconfig

@@ -74,7 +74,7 @@ CONFIG_RTC_DRV_DS1307=y
 # CONFIG_DNOTIFY is not set
 # CONFIG_INOTIFY_USER is not set
 CONFIG_FSCACHE=y
-# CONFIG_PROC_SYSCTL is not set
+# CONFIG_SYSCTL is not set
 CONFIG_JFFS2_FS=y
 CONFIG_ROMFS_FS=y
 CONFIG_ROMFS_BACKED_BY_BOTH=y

arch/m68k/configs/stmark2_defconfig

@@ -87,7 +87,7 @@ CONFIG_EXT4_FS_SECURITY=y
 # CONFIG_DNOTIFY is not set
 # CONFIG_INOTIFY_USER is not set
 CONFIG_OVERLAY_FS=y
-# CONFIG_PROC_SYSCTL is not set
+# CONFIG_SYSCTL is not set
 CONFIG_SQUASHFS=y
 CONFIG_XZ_DEC=y
 CONFIG_PRINTK_TIME=y

arch/s390/Kconfig

@@ -575,7 +575,7 @@ config HIPERDISPATCH_ON
 	def_bool y
 	bool "Use hiperdispatch on vertical polarization by default"
 	depends on SCHED_TOPOLOGY
-	depends on PROC_SYSCTL
+	depends on SYSCTL
 	help
 	  Hiperdispatch aims to improve the CPU scheduler's decision
 	  making when using vertical polarization by adjusting CPU
@@ -893,7 +893,7 @@ config CMM_IUCV
 config APPLDATA_BASE
 	def_bool n
 	prompt "Linux - VM Monitor Stream, base infrastructure"
-	depends on PROC_SYSCTL
+	depends on SYSCTL
 	help
 	  This provides a kernel interface for creating and updating z/VM APPLDATA
 	  monitor records. The monitor records are updated at certain time

arch/x86/kernel/cpu/bus_lock.c

@@ -50,7 +50,7 @@ static struct ratelimit_state bld_ratelimit;
 static unsigned int sysctl_sld_mitigate = 1;
 static DEFINE_SEMAPHORE(buslock_sem, 1);
 
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 static const struct ctl_table sld_sysctls[] = {
 	{
 		.procname       = "split_lock_mitigate",

fs/proc/Kconfig

@@ -80,10 +80,9 @@ config PROC_VMCORE_DEVICE_RAM
 
 	  Relevant architectures should select NEED_PROC_VMCORE_DEVICE_RAM.
 
-config PROC_SYSCTL
+config SYSCTL
 	bool "Sysctl support (/proc/sys)" if EXPERT
 	depends on PROC_FS
-	select SYSCTL
 	default y
 	help
 	  The sysctl interface provides a means of dynamically changing

fs/proc/Makefile

@@ -29,7 +29,7 @@ proc-y	+= softirqs.o
 proc-y	+= namespaces.o
 proc-y	+= self.o
 proc-y	+= thread_self.o
-proc-$(CONFIG_PROC_SYSCTL)	+= proc_sysctl.o
+proc-$(CONFIG_SYSCTL)		+= proc_sysctl.o
 proc-$(CONFIG_NET)		+= proc_net.o
 proc-$(CONFIG_PROC_KCORE)	+= kcore.o
 proc-$(CONFIG_PROC_VMCORE)	+= vmcore.o

fs/proc/internal.h

@@ -351,7 +351,7 @@ extern void proc_thread_self_init(void);
 /*
  * proc_sysctl.c
  */
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 extern int proc_sys_init(void);
 extern void proc_sys_evict_inode(struct inode *inode,
 				 struct ctl_table_header *head);

include/linux/utsname.h

@@ -18,7 +18,7 @@ enum uts_proc {
 	UTS_PROC_DOMAINNAME,
 };
 
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 extern void uts_proc_notify(enum uts_proc proc);
 #else
 static inline void uts_proc_notify(enum uts_proc proc)

init/Kconfig

@@ -1664,9 +1664,6 @@ config LD_ORPHAN_WARN_LEVEL
 	default "error" if WERROR
 	default "warn"
 
-config SYSCTL
-	bool
-
 config HAVE_UID16
 	bool
 

kernel/delayacct.c

@@ -54,7 +54,7 @@ void delayacct_init(void)
 	set_delayacct(delayacct_on);
 }
 
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 static int sysctl_delayacct(const struct ctl_table *table, int write, void *buffer,
 		     size_t *lenp, loff_t *ppos)
 {

kernel/sched/core.c

@@ -4638,7 +4638,7 @@ void set_numabalancing_state(bool enabled)
 	__set_numabalancing_state(enabled);
 }
 
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 static void reset_memory_tiering(void)
 {
 	struct pglist_data *pgdat;
@@ -4674,7 +4674,7 @@ static int sysctl_numa_balancing(const struct ctl_table *table, int write,
 	}
 	return err;
 }
-#endif /* CONFIG_PROC_SYSCTL */
+#endif /* CONFIG_SYSCTL */
 #endif /* CONFIG_NUMA_BALANCING */
 
 #ifdef CONFIG_SCHEDSTATS
@@ -4718,7 +4718,7 @@ out:
 }
 __setup("schedstats=", setup_schedstats);
 
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 static int sysctl_schedstats(const struct ctl_table *table, int write, void *buffer,
 		size_t *lenp, loff_t *ppos)
 {
@@ -4738,7 +4738,7 @@ static int sysctl_schedstats(const struct ctl_table *table, int write, void *buf
 		set_schedstats(state);
 	return err;
 }
-#endif /* CONFIG_PROC_SYSCTL */
+#endif /* CONFIG_SYSCTL */
 #endif /* CONFIG_SCHEDSTATS */
 
 #ifdef CONFIG_SYSCTL

kernel/sched/topology.c

@@ -271,7 +271,7 @@ void rebuild_sched_domains_energy(void)
 	mutex_unlock(&sched_energy_mutex);
 }
 
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 static int sched_energy_aware_handler(const struct ctl_table *table, int write,
 		void *buffer, size_t *lenp, loff_t *ppos)
 {
@@ -317,7 +317,7 @@ static int __init sched_energy_aware_sysctl_init(void)
 }
 
 late_initcall(sched_energy_aware_sysctl_init);
-#endif /* CONFIG_PROC_SYSCTL */
+#endif /* CONFIG_SYSCTL */
 
 static void free_pd(struct perf_domain *pd)
 {

kernel/sysctl.c

@@ -35,7 +35,7 @@ EXPORT_SYMBOL_GPL(sysctl_long_vals);
 static const int ngroups_max = NGROUPS_MAX;
 static const int cap_last_cap = CAP_LAST_CAP;
 
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 
 /**
  * enum sysctl_writes_mode - supported sysctl write modes
@@ -64,14 +64,14 @@ enum sysctl_writes_mode {
 };
 
 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
-#endif /* CONFIG_PROC_SYSCTL */
+#endif /* CONFIG_SYSCTL */
 #endif /* CONFIG_SYSCTL */
 
 /*
  * /proc/sys support
  */
 
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 
 static int _proc_do_string(char *data, int maxlen, int dir,
 		char *buffer, size_t *lenp, loff_t *ppos)
@@ -1240,7 +1240,7 @@ int proc_do_large_bitmap(const struct ctl_table *table, int dir,
 	return err;
 }
 
-#else /* CONFIG_PROC_SYSCTL */
+#else /* CONFIG_SYSCTL */
 
 int proc_dostring(const struct ctl_table *table, int dir,
 		  void *buffer, size_t *lenp, loff_t *ppos)
@@ -1338,7 +1338,7 @@ int proc_do_large_bitmap(const struct ctl_table *table, int dir,
 	return -ENOSYS;
 }
 
-#endif /* CONFIG_PROC_SYSCTL */
+#endif /* CONFIG_SYSCTL */
 
 #if defined(CONFIG_SYSCTL)
 int proc_do_static_key(const struct ctl_table *table, int dir,
@@ -1372,7 +1372,7 @@ int proc_do_static_key(const struct ctl_table *table, int dir,
 }
 
 static const struct ctl_table sysctl_subsys_table[] = {
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 	{
 		.procname	= "sysctl_writes_strict",
 		.data		= &sysctl_writes_strict,

kernel/time/jiffies.c

@@ -98,7 +98,7 @@ void __init register_refined_jiffies(long cycles_per_second)
 	__clocksource_register(&refined_jiffies);
 }
 
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 static ulong mult_hz(const ulong val)
 {
 	return val * HZ;
@@ -185,7 +185,7 @@ static int do_proc_int_conv_ms_jiffies_minmax(bool *negp, ulong *u_ptr,
 			     sysctl_u2k_int_conv_ms, sysctl_k2u_int_conv_ms);
 }
 
-#else // CONFIG_PROC_SYSCTL
+#else // CONFIG_SYSCTL
 static int do_proc_int_conv_jiffies(bool *negp, ulong *u_ptr, int *k_ptr,
 				    int dir, const struct ctl_table *tbl)
 {

kernel/utsname_sysctl.c

@@ -13,7 +13,7 @@
 #include <linux/wait.h>
 #include <linux/rwsem.h>
 
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 
 static void *get_uts(const struct ctl_table *table)
 {
@@ -122,7 +122,7 @@ static const struct ctl_table uts_kern_table[] = {
 	},
 };
 
-#ifdef CONFIG_PROC_SYSCTL
+#ifdef CONFIG_SYSCTL
 /*
  * Notify userspace about a change in a certain entry of uts_kern_table,
  * identified by the parameter proc.

lib/Kconfig.debug

@@ -2710,7 +2710,7 @@ config TEST_FIRMWARE
 
 config TEST_SYSCTL
 	tristate "sysctl test driver"
-	depends on PROC_SYSCTL
+	depends on SYSCTL
 	help
 	  This builds the "test_sysctl" module. This driver enables to test the
 	  proc sysctl interfaces available to drivers safely without affecting

lib/test_sysctl.c

@@ -7,7 +7,7 @@
 
 /*
  * This module provides an interface to the proc sysctl interfaces.  This
- * driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the
+ * driver requires CONFIG_SYSCTL. It will not normally be loaded by the
  * system unless explicitly requested by name. You can also build this driver
  * into your kernel.
  */

net/mpls/Kconfig

@@ -26,7 +26,7 @@ config NET_MPLS_GSO
 config MPLS_ROUTING
 	tristate "MPLS: routing support"
 	depends on NET_IP_TUNNEL || NET_IP_TUNNEL=n
-	depends on PROC_SYSCTL
+	depends on SYSCTL
 	help
 	 Add support for forwarding of mpls packets.
 

tools/testing/selftests/net/config

@@ -118,7 +118,7 @@ CONFIG_OPENVSWITCH_GENEVE=m
 CONFIG_OPENVSWITCH_GRE=m
 CONFIG_OPENVSWITCH_VXLAN=m
 CONFIG_PAGE_POOL_STATS=y
-CONFIG_PROC_SYSCTL=y
+CONFIG_SYSCTL=y
 CONFIG_PSAMPLE=m
 CONFIG_RPS=y
 CONFIG_SYN_COOKIES=y

tools/testing/selftests/net/packetdrill/config

@@ -4,7 +4,7 @@ CONFIG_IPV6=y
 CONFIG_NET_NS=y
 CONFIG_NET_SCH_FIFO=y
 CONFIG_NET_SCH_FQ=y
-CONFIG_PROC_SYSCTL=y
+CONFIG_SYSCTL=y
 CONFIG_SYN_COOKIES=y
 CONFIG_TCP_CONG_CUBIC=y
 CONFIG_TCP_MD5SIG=y