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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/s390
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/s390')
-rw-r--r--arch/s390/Kconfig1
-rw-r--r--arch/s390/Makefile1
-rw-r--r--arch/s390/include/asm/smp.h2
-rw-r--r--arch/s390/kernel/Makefile2
-rw-r--r--arch/s390/kernel/init_task.c38
-rw-r--r--arch/s390/kernel/smp.c35
6 files changed, 6 insertions, 73 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index b42f2866594b..e16390c0bca8 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -122,6 +122,7 @@ config S390
select ARCH_INLINE_WRITE_UNLOCK_BH
select ARCH_INLINE_WRITE_UNLOCK_IRQ
select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
+ select GENERIC_SMP_IDLE_THREAD
config SCHED_OMIT_FRAME_POINTER
def_bool y
diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index 0ad2f1e1ce9e..49e76e8b477d 100644
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -91,7 +91,6 @@ OBJCOPYFLAGS := -O binary
head-y := arch/s390/kernel/head.o
head-y += arch/s390/kernel/$(if $(CONFIG_64BIT),head64.o,head31.o)
-head-y += arch/s390/kernel/init_task.o
# See arch/s390/Kbuild for content of core part of the kernel
core-y += arch/s390/
diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h
index c77c6de6f6c0..0b6f586c1383 100644
--- a/arch/s390/include/asm/smp.h
+++ b/arch/s390/include/asm/smp.h
@@ -16,7 +16,7 @@
extern struct mutex smp_cpu_state_mutex;
extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
-extern int __cpu_up(unsigned int cpu);
+extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 884b18afc864..9733b3f0eb6d 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -28,7 +28,7 @@ obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o vtime.o \
obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o)
obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o)
-extra-y += head.o init_task.o vmlinux.lds
+extra-y += head.o vmlinux.lds
extra-y += $(if $(CONFIG_64BIT),head64.o,head31.o)
obj-$(CONFIG_MODULES) += s390_ksyms.o module.o
diff --git a/arch/s390/kernel/init_task.c b/arch/s390/kernel/init_task.c
deleted file mode 100644
index 4d1c9fb0b540..000000000000
--- a/arch/s390/kernel/init_task.c
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- * arch/s390/kernel/init_task.c
- *
- * S390 version
- *
- * Derived from "arch/i386/kernel/init_task.c"
- */
-
-#include <linux/mm.h>
-#include <linux/fs.h>
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/init_task.h>
-#include <linux/mqueue.h>
-
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-
-static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
-static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
-/*
- * Initial thread structure.
- *
- * We need to make sure that this is THREAD_SIZE aligned due to the
- * way process stacks are handled. This is done by having a special
- * "init_task" linker map entry..
- */
-union thread_union init_thread_union __init_task_data =
- { INIT_THREAD_INFO(init_task) };
-
-/*
- * Initial task structure.
- *
- * All other task structs will be allocated on slabs in fork.c
- */
-struct task_struct init_task = INIT_TASK(init_task);
-
-EXPORT_SYMBOL(init_task);
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index e505458c6899..647ba9425893 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -85,7 +85,6 @@ enum {
struct pcpu {
struct cpu cpu;
- struct task_struct *idle; /* idle process for the cpu */
struct _lowcore *lowcore; /* lowcore page(s) for the cpu */
unsigned long async_stack; /* async stack for the cpu */
unsigned long panic_stack; /* panic stack for the cpu */
@@ -725,26 +724,9 @@ static void __cpuinit smp_start_secondary(void *cpuvoid)
cpu_idle();
}
-struct create_idle {
- struct work_struct work;
- struct task_struct *idle;
- struct completion done;
- int cpu;
-};
-
-static void __cpuinit smp_fork_idle(struct work_struct *work)
-{
- struct create_idle *c_idle;
-
- c_idle = container_of(work, struct create_idle, work);
- c_idle->idle = fork_idle(c_idle->cpu);
- complete(&c_idle->done);
-}
-
/* Upping and downing of CPUs */
-int __cpuinit __cpu_up(unsigned int cpu)
+int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle)
{
- struct create_idle c_idle;
struct pcpu *pcpu;
int rc;
@@ -754,22 +736,12 @@ int __cpuinit __cpu_up(unsigned int cpu)
if (pcpu_sigp_retry(pcpu, sigp_initial_cpu_reset, 0) !=
sigp_order_code_accepted)
return -EIO;
- if (!pcpu->idle) {
- c_idle.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done);
- INIT_WORK_ONSTACK(&c_idle.work, smp_fork_idle);
- c_idle.cpu = cpu;
- schedule_work(&c_idle.work);
- wait_for_completion(&c_idle.done);
- if (IS_ERR(c_idle.idle))
- return PTR_ERR(c_idle.idle);
- pcpu->idle = c_idle.idle;
- }
- init_idle(pcpu->idle, cpu);
+
rc = pcpu_alloc_lowcore(pcpu, cpu);
if (rc)
return rc;
pcpu_prepare_secondary(pcpu, cpu);
- pcpu_attach_task(pcpu, pcpu->idle);
+ pcpu_attach_task(pcpu, tidle);
pcpu_start_fn(pcpu, smp_start_secondary, NULL);
while (!cpu_online(cpu))
cpu_relax();
@@ -856,7 +828,6 @@ void __init smp_prepare_boot_cpu(void)
struct pcpu *pcpu = pcpu_devices;
boot_cpu_address = stap();
- pcpu->idle = current;
pcpu->state = CPU_STATE_CONFIGURED;
pcpu->address = boot_cpu_address;
pcpu->lowcore = (struct _lowcore *)(unsigned long) store_prefix();