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authorLinus Torvalds <torvalds@linux-foundation.org>2012-05-21 19:43:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-21 19:43:57 -0700
commitbf67f3a5c456a18f2e8d062f7e88506ef2cd9837 (patch)
tree2a2324b2572162059307db82f9238eeb25673a77 /arch/ia64
parent226da0dbc84ed97f448523e2a4cb91c27fa68ed9 (diff)
parent203dacbdca977bedaba61ad2fca75d934060a5d5 (diff)
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull smp hotplug cleanups from Thomas Gleixner: "This series is merily a cleanup of code copied around in arch/* and not changing any of the real cpu hotplug horrors yet. I wish I'd had something more substantial for 3.5, but I underestimated the lurking horror..." Fix up trivial conflicts in arch/{arm,sparc,x86}/Kconfig and arch/sparc/include/asm/thread_info_32.h * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (79 commits) um: Remove leftover declaration of alloc_task_struct_node() task_allocator: Use config switches instead of magic defines sparc: Use common threadinfo allocator score: Use common threadinfo allocator sh-use-common-threadinfo-allocator mn10300: Use common threadinfo allocator powerpc: Use common threadinfo allocator mips: Use common threadinfo allocator hexagon: Use common threadinfo allocator m32r: Use common threadinfo allocator frv: Use common threadinfo allocator cris: Use common threadinfo allocator x86: Use common threadinfo allocator c6x: Use common threadinfo allocator fork: Provide kmemcache based thread_info allocator tile: Use common threadinfo allocator fork: Provide weak arch_release_[task_struct|thread_info] functions fork: Move thread info gfp flags to header fork: Remove the weak insanity sh: Remove cpu_idle_wait() ...
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/Kconfig4
-rw-r--r--arch/ia64/include/asm/processor.h1
-rw-r--r--arch/ia64/include/asm/thread_info.h3
-rw-r--r--arch/ia64/kernel/process.c20
-rw-r--r--arch/ia64/kernel/smpboot.c63
5 files changed, 8 insertions, 83 deletions
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index bd7266903bf8..ba667b60f32d 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -33,6 +33,10 @@ config IA64
select ARCH_WANT_OPTIONAL_GPIOLIB
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select GENERIC_IOMAP
+ select GENERIC_SMP_IDLE_THREAD
+ select ARCH_INIT_TASK
+ select ARCH_TASK_STRUCT_ALLOCATOR
+ select ARCH_THREAD_INFO_ALLOCATOR
default y
help
The Itanium Processor Family is Intel's 64-bit successor to
diff --git a/arch/ia64/include/asm/processor.h b/arch/ia64/include/asm/processor.h
index 483f6c6a4238..f92f67aba618 100644
--- a/arch/ia64/include/asm/processor.h
+++ b/arch/ia64/include/asm/processor.h
@@ -723,7 +723,6 @@ extern unsigned long boot_option_idle_override;
enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_FORCE_MWAIT,
IDLE_NOMWAIT, IDLE_POLL};
-void cpu_idle_wait(void);
void default_idle(void);
#define ia64_platform_is(x) (strcmp(x, platform_name) == 0)
diff --git a/arch/ia64/include/asm/thread_info.h b/arch/ia64/include/asm/thread_info.h
index e054bcc4273c..310d9734f02d 100644
--- a/arch/ia64/include/asm/thread_info.h
+++ b/arch/ia64/include/asm/thread_info.h
@@ -54,8 +54,6 @@ struct thread_info {
}, \
}
-#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
-
#ifndef ASM_OFFSETS_C
/* how to get the thread information struct from C */
#define current_thread_info() ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
@@ -84,7 +82,6 @@ struct thread_info {
#endif
#define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
-#define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
#define alloc_task_struct_node(node) \
({ \
struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP, \
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index ce74e143aea3..5e0e86ddb12f 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -273,26 +273,6 @@ static inline void play_dead(void)
}
#endif /* CONFIG_HOTPLUG_CPU */
-static void do_nothing(void *unused)
-{
-}
-
-/*
- * cpu_idle_wait - Used to ensure that all the CPUs discard old value of
- * pm_idle and update to new pm_idle value. Required while changing pm_idle
- * handler on SMP systems.
- *
- * Caller must have changed pm_idle to the new value before the call. Old
- * pm_idle value will not be used by any CPU after the return of this function.
- */
-void cpu_idle_wait(void)
-{
- smp_mb();
- /* kick all the CPUs so that they exit out of pm_idle */
- smp_call_function(do_nothing, NULL, 1);
-}
-EXPORT_SYMBOL_GPL(cpu_idle_wait);
-
void __attribute__((noreturn))
cpu_idle (void)
{
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 796f6a5b966a..1113b8aba07f 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -75,13 +75,6 @@
#endif
/*
- * Store all idle threads, this can be reused instead of creating
- * a new thread. Also avoids complicated thread destroy functionality
- * for idle threads.
- */
-struct task_struct *idle_thread_array[NR_CPUS];
-
-/*
* Global array allocated for NR_CPUS at boot time
*/
struct sal_to_os_boot sal_boot_rendez_state[NR_CPUS];
@@ -94,13 +87,7 @@ struct sal_to_os_boot *sal_state_for_booting_cpu = &sal_boot_rendez_state[0];
#define set_brendez_area(x) (sal_state_for_booting_cpu = &sal_boot_rendez_state[(x)]);
-#define get_idle_for_cpu(x) (idle_thread_array[(x)])
-#define set_idle_for_cpu(x,p) (idle_thread_array[(x)] = (p))
-
#else
-
-#define get_idle_for_cpu(x) (NULL)
-#define set_idle_for_cpu(x,p)
#define set_brendez_area(x)
#endif
@@ -480,54 +467,12 @@ struct pt_regs * __cpuinit idle_regs(struct pt_regs *regs)
return NULL;
}
-struct create_idle {
- struct work_struct work;
- struct task_struct *idle;
- struct completion done;
- int cpu;
-};
-
-void __cpuinit
-do_fork_idle(struct work_struct *work)
-{
- struct create_idle *c_idle =
- container_of(work, struct create_idle, work);
-
- c_idle->idle = fork_idle(c_idle->cpu);
- complete(&c_idle->done);
-}
-
static int __cpuinit
-do_boot_cpu (int sapicid, int cpu)
+do_boot_cpu (int sapicid, int cpu, struct task_struct *idle)
{
int timeout;
- struct create_idle c_idle = {
- .work = __WORK_INITIALIZER(c_idle.work, do_fork_idle),
- .cpu = cpu,
- .done = COMPLETION_INITIALIZER(c_idle.done),
- };
-
- /*
- * We can't use kernel_thread since we must avoid to
- * reschedule the child.
- */
- c_idle.idle = get_idle_for_cpu(cpu);
- if (c_idle.idle) {
- init_idle(c_idle.idle, cpu);
- goto do_rest;
- }
-
- schedule_work(&c_idle.work);
- wait_for_completion(&c_idle.done);
-
- if (IS_ERR(c_idle.idle))
- panic("failed fork for CPU %d", cpu);
-
- set_idle_for_cpu(cpu, c_idle.idle);
-
-do_rest:
- task_for_booting_cpu = c_idle.idle;
+ task_for_booting_cpu = idle;
Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid);
set_brendez_area(cpu);
@@ -793,7 +738,7 @@ set_cpu_sibling_map(int cpu)
}
int __cpuinit
-__cpu_up (unsigned int cpu)
+__cpu_up(unsigned int cpu, struct task_struct *tidle)
{
int ret;
int sapicid;
@@ -811,7 +756,7 @@ __cpu_up (unsigned int cpu)
per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
/* Processor goes to start_secondary(), sets online flag */
- ret = do_boot_cpu(sapicid, cpu);
+ ret = do_boot_cpu(sapicid, cpu, tidle);
if (ret < 0)
return ret;