diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/kernel/apm.c | 6 | ||||
| -rw-r--r-- | arch/i386/kernel/process.c | 7 | ||||
| -rw-r--r-- | arch/ia64/kernel/process.c | 10 | ||||
| -rw-r--r-- | arch/x86_64/kernel/process.c | 6 |
4 files changed, 24 insertions, 5 deletions
diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c index b75cff25de4..19901692754 100644 --- a/arch/i386/kernel/apm.c +++ b/arch/i386/kernel/apm.c @@ -785,7 +785,11 @@ static int apm_do_idle(void) polling = !!(current_thread_info()->status & TS_POLLING); if (polling) { current_thread_info()->status &= ~TS_POLLING; - smp_mb__after_clear_bit(); + /* + * TS_POLLING-cleared state must be visible before we + * test NEED_RESCHED: + */ + smp_mb(); } if (!need_resched()) { idled = 1; diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c index 99308510a17..c641056233a 100644 --- a/arch/i386/kernel/process.c +++ b/arch/i386/kernel/process.c @@ -102,7 +102,12 @@ void default_idle(void) { if (!hlt_counter && boot_cpu_data.hlt_works_ok) { current_thread_info()->status &= ~TS_POLLING; - smp_mb__after_clear_bit(); + /* + * TS_POLLING-cleared state must be visible before we + * test NEED_RESCHED: + */ + smp_mb(); + local_irq_disable(); if (!need_resched()) safe_halt(); /* enables interrupts racelessly */ diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c index 51922b98086..17685abaf49 100644 --- a/arch/ia64/kernel/process.c +++ b/arch/ia64/kernel/process.c @@ -268,10 +268,16 @@ cpu_idle (void) /* endless idle loop with no priority at all */ while (1) { - if (can_do_pal_halt) + if (can_do_pal_halt) { current_thread_info()->status &= ~TS_POLLING; - else + /* + * TS_POLLING-cleared state must be visible before we + * test NEED_RESCHED: + */ + smp_mb(); + } else { current_thread_info()->status |= TS_POLLING; + } if (!need_resched()) { void (*idle)(void); diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c index a418ee4c8c6..cbbc6adc1a9 100644 --- a/arch/x86_64/kernel/process.c +++ b/arch/x86_64/kernel/process.c @@ -109,7 +109,11 @@ void exit_idle(void) static void default_idle(void) { current_thread_info()->status &= ~TS_POLLING; - smp_mb__after_clear_bit(); + /* + * TS_POLLING-cleared state must be visible before we + * test NEED_RESCHED: + */ + smp_mb(); local_irq_disable(); if (!need_resched()) { /* Enables interrupts one instruction before HLT. |