1751f872cc
Add the const qualifier to all the ctl_tables in the tree except for
watchdog_hardlockup_sysctl, memory_allocation_profiling_sysctls,
loadpin_sysctl_table and the ones calling register_net_sysctl (./net,
drivers/inifiniband dirs). These are special cases as they use a
registration function with a non-const qualified ctl_table argument or
modify the arrays before passing them on to the registration function.
Constifying ctl_table structs will prevent the modification of
proc_handler function pointers as the arrays would reside in .rodata.
This is made possible after commit 78eb4ea25c ("sysctl: treewide:
constify the ctl_table argument of proc_handlers") constified all the
proc_handlers.
Created this by running an spatch followed by a sed command:
Spatch:
virtual patch
@
depends on !(file in "net")
disable optional_qualifier
@
identifier table_name != {
watchdog_hardlockup_sysctl,
iwcm_ctl_table,
ucma_ctl_table,
memory_allocation_profiling_sysctls,
loadpin_sysctl_table
};
@@
+ const
struct ctl_table table_name [] = { ... };
sed:
sed --in-place \
-e "s/struct ctl_table .table = &uts_kern/const struct ctl_table *table = \&uts_kern/" \
kernel/utsname_sysctl.c
Reviewed-by: Song Liu <song@kernel.org>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> # for kernel/trace/
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> # SCSI
Reviewed-by: Darrick J. Wong <djwong@kernel.org> # xfs
Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Corey Minyard <cminyard@mvista.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
Acked-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Acked-by: Anna Schumaker <anna.schumaker@oracle.com>
Signed-off-by: Joel Granados <joel.granados@kernel.org>
118 lines
2.5 KiB
C
118 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Idle daemon for PowerPC. Idle daemon will handle any action
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* that needs to be taken when the system becomes idle.
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*
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* Originally written by Cort Dougan (cort@cs.nmt.edu).
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* Subsequent 32-bit hacking by Tom Rini, Armin Kuster,
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* Paul Mackerras and others.
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*
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* iSeries supported added by Mike Corrigan <mikejc@us.ibm.com>
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*
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* Additional shared processor, SMT, and firmware support
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* Copyright (c) 2003 Dave Engebretsen <engebret@us.ibm.com>
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*
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* 32-bit and 64-bit versions merged by Paul Mackerras <paulus@samba.org>
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/smp.h>
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#include <linux/cpu.h>
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#include <linux/sysctl.h>
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#include <linux/tick.h>
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#include <asm/processor.h>
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#include <asm/cputable.h>
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#include <asm/time.h>
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#include <asm/machdep.h>
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#include <asm/runlatch.h>
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#include <asm/smp.h>
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unsigned long cpuidle_disable = IDLE_NO_OVERRIDE;
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EXPORT_SYMBOL(cpuidle_disable);
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static int __init powersave_off(char *arg)
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{
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ppc_md.power_save = NULL;
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cpuidle_disable = IDLE_POWERSAVE_OFF;
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return 1;
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}
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__setup("powersave=off", powersave_off);
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void arch_cpu_idle(void)
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{
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ppc64_runlatch_off();
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if (ppc_md.power_save) {
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ppc_md.power_save();
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/*
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* Some power_save functions return with
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* interrupts enabled, some don't.
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*/
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if (!irqs_disabled())
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raw_local_irq_disable();
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} else {
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/*
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* Go into low thread priority and possibly
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* low power mode.
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*/
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HMT_low();
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HMT_very_low();
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}
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HMT_medium();
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ppc64_runlatch_on();
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}
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int powersave_nap;
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#ifdef CONFIG_PPC_970_NAP
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void power4_idle(void)
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{
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if (!cpu_has_feature(CPU_FTR_CAN_NAP))
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return;
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if (!powersave_nap)
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return;
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if (!prep_irq_for_idle())
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return;
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if (cpu_has_feature(CPU_FTR_ALTIVEC))
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asm volatile(PPC_DSSALL " ; sync" ::: "memory");
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power4_idle_nap();
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/*
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* power4_idle_nap returns with interrupts enabled (soft and hard).
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* to our caller with interrupts enabled (soft and hard). Our caller
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* can cope with either interrupts disabled or enabled upon return.
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*/
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}
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#endif
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#ifdef CONFIG_SYSCTL
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/*
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* Register the sysctl to set/clear powersave_nap.
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*/
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static const struct ctl_table powersave_nap_ctl_table[] = {
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{
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.procname = "powersave-nap",
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.data = &powersave_nap,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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};
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static int __init
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register_powersave_nap_sysctl(void)
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{
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register_sysctl("kernel", powersave_nap_ctl_table);
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return 0;
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}
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__initcall(register_powersave_nap_sysctl);
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#endif
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