From e12f65f7a49905c013263ac522af224892aafc00 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Sat, 25 Jul 2009 18:14:37 +0200 Subject: locking, ACPI: Annotate c3_lock as raw We cannot preempt this lock on -rt as we are in an interrupt disabled region and about to go into deep sleep. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. Signed-off-by: Thomas Gleixner Cc: Len Brown Signed-off-by: Ingo Molnar --- drivers/acpi/processor_idle.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/acpi/processor_idle.c') diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 431ab11c8c1b..3e0531405997 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -852,7 +852,7 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev, } static int c3_cpu_count; -static DEFINE_SPINLOCK(c3_lock); +static DEFINE_RAW_SPINLOCK(c3_lock); /** * acpi_idle_enter_bm - enters C3 with proper BM handling @@ -930,12 +930,12 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev, * without doing anything. */ if (pr->flags.bm_check && pr->flags.bm_control) { - spin_lock(&c3_lock); + raw_spin_lock(&c3_lock); c3_cpu_count++; /* Disable bus master arbitration when all CPUs are in C3 */ if (c3_cpu_count == num_online_cpus()) acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1); - spin_unlock(&c3_lock); + raw_spin_unlock(&c3_lock); } else if (!pr->flags.bm_check) { ACPI_FLUSH_CPU_CACHE(); } @@ -944,10 +944,10 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev, /* Re-enable bus master arbitration */ if (pr->flags.bm_check && pr->flags.bm_control) { - spin_lock(&c3_lock); + raw_spin_lock(&c3_lock); acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0); c3_cpu_count--; - spin_unlock(&c3_lock); + raw_spin_unlock(&c3_lock); } kt2 = ktime_get_real(); idle_time_ns = ktime_to_ns(ktime_sub(kt2, kt1)); -- cgit v1.2.3