diff options
| author | Frank Rowand <frank.rowand@am.sony.com> | 2011-09-19 14:51:14 -0700 |
|---|---|---|
| committer | Clark Williams <williams@redhat.com> | 2012-03-01 09:28:25 -0600 |
| commit | 4a3b618c48419d804e000ff2179a6076bacf0cda (patch) | |
| tree | 0330f39af77d570f59516465390d30bbf2a544a7 /arch/arm/mach-tegra/platsmp.c | |
| parent | 3796315d0f883523742e4ab48376657f7c95102d (diff) | |
preempt-rt: Convert arm boot_lock to raw
The arm boot_lock is used by the secondary processor startup code. The locking
task is the idle thread, which has idle->sched_class == &idle_sched_class.
idle_sched_class->enqueue_task == NULL, so if the idle task blocks on the
lock, the attempt to wake it when the lock becomes available will fail:
try_to_wake_up()
...
activate_task()
enqueue_task()
p->sched_class->enqueue_task(rq, p, flags)
Fix by converting boot_lock to a raw spin lock.
Signed-off-by: Frank Rowand <frank.rowand@am.sony.com>
Link: http://lkml.kernel.org/r/4E77B952.3010606@am.sony.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/arm/mach-tegra/platsmp.c')
| -rw-r--r-- | arch/arm/mach-tegra/platsmp.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c index 7d2b5d03c1df..571f61a35894 100644 --- a/arch/arm/mach-tegra/platsmp.c +++ b/arch/arm/mach-tegra/platsmp.c @@ -28,7 +28,7 @@ extern void tegra_secondary_startup(void); -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); static void __iomem *scu_base = IO_ADDRESS(TEGRA_ARM_PERIF_BASE); #define EVP_CPU_RESET_VECTOR \ @@ -50,8 +50,8 @@ void __cpuinit platform_secondary_init(unsigned int cpu) /* * Synchronise with the boot thread. */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); + raw_spin_lock(&boot_lock); + raw_spin_unlock(&boot_lock); } int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) @@ -65,7 +65,7 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) * set synchronisation state between this boot processor * and the secondary one */ - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); /* set the reset vector to point to the secondary_startup routine */ @@ -101,7 +101,7 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) * now the secondary core is starting up let it run its * calibrations, then wait for it to finish */ - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); return 0; } |