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authorLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 07:50:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 07:50:17 -0700
commit8700c95adb033843fc163d112b9d21d4fda78018 (patch)
tree7bb9a37b8fe6328f63a61d88063c556346001098 /arch/ia64
parent16fa94b532b1958f508e07eca1a9256351241fbc (diff)
parentd190e8195b90bc1e65c494fe08e54e9e581bfd16 (diff)
downloadlinux-8700c95adb033843fc163d112b9d21d4fda78018.tar.bz2
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull SMP/hotplug changes from Ingo Molnar: "This is a pretty large, multi-arch series unifying and generalizing the various disjunct pieces of idle routines that architectures have historically copied from each other and have grown in random, wildly inconsistent and sometimes buggy directions: 101 files changed, 455 insertions(+), 1328 deletions(-) this went through a number of review and test iterations before it was committed, it was tested on various architectures, was exposed to linux-next for quite some time - nevertheless it might cause problems on architectures that don't read the mailing lists and don't regularly test linux-next. This cat herding excercise was motivated by the -rt kernel, and was brought to you by Thomas "the Whip" Gleixner." * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits) idle: Remove GENERIC_IDLE_LOOP config switch um: Use generic idle loop ia64: Make sure interrupts enabled when we "safe_halt()" sparc: Use generic idle loop idle: Remove unused ARCH_HAS_DEFAULT_IDLE bfin: Fix typo in arch_cpu_idle() xtensa: Use generic idle loop x86: Use generic idle loop unicore: Use generic idle loop tile: Use generic idle loop tile: Enter idle with preemption disabled sh: Use generic idle loop score: Use generic idle loop s390: Use generic idle loop powerpc: Use generic idle loop parisc: Use generic idle loop openrisc: Use generic idle loop mn10300: Use generic idle loop mips: Use generic idle loop microblaze: Use generic idle loop ...
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/include/asm/irqflags.h1
-rw-r--r--arch/ia64/include/asm/thread_info.h2
-rw-r--r--arch/ia64/kernel/perfmon.c14
-rw-r--r--arch/ia64/kernel/process.c78
-rw-r--r--arch/ia64/kernel/smpboot.c2
5 files changed, 23 insertions, 74 deletions
diff --git a/arch/ia64/include/asm/irqflags.h b/arch/ia64/include/asm/irqflags.h
index 2b68d856dc78..1bf2cf2f4ab4 100644
--- a/arch/ia64/include/asm/irqflags.h
+++ b/arch/ia64/include/asm/irqflags.h
@@ -89,6 +89,7 @@ static inline bool arch_irqs_disabled(void)
static inline void arch_safe_halt(void)
{
+ arch_local_irq_enable();
ia64_pal_halt_light(); /* PAL_HALT_LIGHT */
}
diff --git a/arch/ia64/include/asm/thread_info.h b/arch/ia64/include/asm/thread_info.h
index 020d655ed082..cade13dd0299 100644
--- a/arch/ia64/include/asm/thread_info.h
+++ b/arch/ia64/include/asm/thread_info.h
@@ -131,8 +131,6 @@ struct thread_info {
#define TS_POLLING 1 /* true if in idle loop and not sleeping */
#define TS_RESTORE_SIGMASK 2 /* restore signal mask in do_signal() */
-#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
-
#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK 1
static inline void set_restore_sigmask(void)
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index 2eda28414abb..9ea25fce06d5 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -42,6 +42,7 @@
#include <linux/completion.h>
#include <linux/tracehook.h>
#include <linux/slab.h>
+#include <linux/cpu.h>
#include <asm/errno.h>
#include <asm/intrinsics.h>
@@ -1322,8 +1323,6 @@ out:
}
EXPORT_SYMBOL(pfm_unregister_buffer_fmt);
-extern void update_pal_halt_status(int);
-
static int
pfm_reserve_session(struct task_struct *task, int is_syswide, unsigned int cpu)
{
@@ -1371,9 +1370,9 @@ pfm_reserve_session(struct task_struct *task, int is_syswide, unsigned int cpu)
cpu));
/*
- * disable default_idle() to go to PAL_HALT
+ * Force idle() into poll mode
*/
- update_pal_halt_status(0);
+ cpu_idle_poll_ctrl(true);
UNLOCK_PFS(flags);
@@ -1430,11 +1429,8 @@ pfm_unreserve_session(pfm_context_t *ctx, int is_syswide, unsigned int cpu)
is_syswide,
cpu));
- /*
- * if possible, enable default_idle() to go into PAL_HALT
- */
- if (pfm_sessions.pfs_task_sessions == 0 && pfm_sessions.pfs_sys_sessions == 0)
- update_pal_halt_status(1);
+ /* Undo forced polling. Last session reenables pal_halt */
+ cpu_idle_poll_ctrl(false);
UNLOCK_PFS(flags);
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 6f7dc8b7b35c..a26fc640e4ce 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -209,41 +209,13 @@ do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
local_irq_disable(); /* force interrupt disable */
}
-static int pal_halt = 1;
-static int can_do_pal_halt = 1;
-
static int __init nohalt_setup(char * str)
{
- pal_halt = can_do_pal_halt = 0;
+ cpu_idle_poll_ctrl(true);
return 1;
}
__setup("nohalt", nohalt_setup);
-void
-update_pal_halt_status(int status)
-{
- can_do_pal_halt = pal_halt && status;
-}
-
-/*
- * We use this if we don't have any better idle routine..
- */
-void
-default_idle (void)
-{
- local_irq_enable();
- while (!need_resched()) {
- if (can_do_pal_halt) {
- local_irq_disable();
- if (!need_resched()) {
- safe_halt();
- }
- local_irq_enable();
- } else
- cpu_relax();
- }
-}
-
#ifdef CONFIG_HOTPLUG_CPU
/* We don't actually take CPU down, just spin without interrupts. */
static inline void play_dead(void)
@@ -270,47 +242,29 @@ static inline void play_dead(void)
}
#endif /* CONFIG_HOTPLUG_CPU */
-void __attribute__((noreturn))
-cpu_idle (void)
+void arch_cpu_idle_dead(void)
+{
+ play_dead();
+}
+
+void arch_cpu_idle(void)
{
void (*mark_idle)(int) = ia64_mark_idle;
- int cpu = smp_processor_id();
-
- /* endless idle loop with no priority at all */
- while (1) {
- rcu_idle_enter();
- if (can_do_pal_halt) {
- current_thread_info()->status &= ~TS_POLLING;
- /*
- * TS_POLLING-cleared state must be visible before we
- * test NEED_RESCHED:
- */
- smp_mb();
- } else {
- current_thread_info()->status |= TS_POLLING;
- }
- if (!need_resched()) {
#ifdef CONFIG_SMP
- min_xtp();
+ min_xtp();
#endif
- rmb();
- if (mark_idle)
- (*mark_idle)(1);
+ rmb();
+ if (mark_idle)
+ (*mark_idle)(1);
+
+ safe_halt();
- default_idle();
- if (mark_idle)
- (*mark_idle)(0);
+ if (mark_idle)
+ (*mark_idle)(0);
#ifdef CONFIG_SMP
- normal_xtp();
+ normal_xtp();
#endif
- }
- rcu_idle_exit();
- schedule_preempt_disabled();
- check_pgt_cache();
- if (cpu_is_offline(cpu))
- play_dead();
- }
}
void
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 500f1e4d9f9d..8d87168d218d 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -455,7 +455,7 @@ start_secondary (void *unused)
preempt_disable();
smp_callin();
- cpu_idle();
+ cpu_startup_entry(CPUHP_ONLINE);
return 0;
}