Merge commit 'v3.3-rc1' into stable/for-linus-fixes-3.3

* commit 'v3.3-rc1': (9775 commits)
  Linux 3.3-rc1
  x86, syscall: Need __ARCH_WANT_SYS_IPC for 32 bits
  qnx4: don't leak ->BitMap on late failure exits
  qnx4: reduce the insane nesting in qnx4_checkroot()
  qnx4: di_fname is an array, for crying out loud...
  KEYS: Permit key_serial() to be called with a const key pointer
  keys: fix user_defined key sparse messages
  ima: fix cred sparse warning
  uml: fix compile for x86-64
  MPILIB: Add a missing ENOMEM check
  tpm: fix (ACPI S3) suspend regression
  nvme: fix merge error due to change of 'make_request_fn' fn type
  xen: using EXPORT_SYMBOL requires including export.h
  gpio: tps65910: Use correct offset for gpio initialization
  acpi/apei/einj: Add extensions to EINJ from rev 5.0 of acpi spec
  intel_idle: Split up and provide per CPU initialization func
  ACPI processor: Remove unneeded variable passed by acpi_processor_hotadd_init V2
  tg3: Fix single-vector MSI-X code
  openvswitch: Fix multipart datapath dumps.
  ipv6: fix per device IP snmp counters
  ...

1 files changed, 31 insertions, 1 deletions

diff --git a/arch/arm/mach-shmobile/hotplug.c b/arch/arm/mach-shmobile/hotplug.c
index 238a0d97d2d5..828d22f3af57 100644
--- a/arch/arm/mach-shmobile/hotplug.c
+++ b/arch/arm/mach-shmobile/hotplug.c
@@ -12,14 +12,43 @@
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/smp.h>
+#include <linux/cpumask.h>
+#include <linux/delay.h>
+#include <mach/common.h>
+#include <asm/cacheflush.h>
+
+static cpumask_t dead_cpus;
 
 int platform_cpu_kill(unsigned int cpu)
 {
-	return 1;
+	int k;
+
+	/* this function is running on another CPU than the offline target,
+	 * here we need wait for shutdown code in platform_cpu_die() to
+	 * finish before asking SoC-specific code to power off the CPU core.
+	 */
+	for (k = 0; k < 1000; k++) {
+		if (cpumask_test_cpu(cpu, &dead_cpus))
+			return shmobile_platform_cpu_kill(cpu);
+
+		mdelay(1);
+	}
+
+	return 0;
 }
 
 void platform_cpu_die(unsigned int cpu)
 {
+	/* hardware shutdown code running on the CPU that is being offlined */
+	flush_cache_all();
+	dsb();
+
+	/* notify platform_cpu_kill() that hardware shutdown is finished */
+	cpumask_set_cpu(cpu, &dead_cpus);
+
+	/* wait for SoC code in platform_cpu_kill() to shut off CPU core
+	 * power. CPU bring up starts from the reset vector.
+	 */
 	while (1) {
 		/*
 		 * here's the WFI
@@ -33,6 +62,7 @@ void platform_cpu_die(unsigned int cpu)
 
 int platform_cpu_disable(unsigned int cpu)
 {
+	cpumask_clear_cpu(cpu, &dead_cpus);
 	/*
 	 * we don't allow CPU 0 to be shutdown (it is still too special
 	 * e.g. clock tick interrupts)