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ftrace: disable tracing on acpi idle calls 

The acpi idle waits calls local_irq_save and then uses mwait to go into
idle. The tracer gets reenabled at local_irq_save but does not detect that
the idle allows for wake ups.

This patch adds code to disable the tracing when acpi puts the CPU to idle.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt 2008-07-25 18:00:42 -04:00 committed by Ingo Molnar
parent 1986b0cb16
commit dcf3099745
1 changed files with 6 additions and 0 deletions
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6
drivers/acpi/processor_idle.c
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@ -272,6 +272,8 @@ static atomic_t c3_cpu_count;
/* Common C-state entry for C2, C3, .. */ /* Common C-state entry for C2, C3, .. */
static void acpi_cstate_enter(struct acpi_processor_cx *cstate) static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
{ {
/* Don't trace irqs off for idle */
stop_critical_timings();
if (cstate->entry_method == ACPI_CSTATE_FFH) { if (cstate->entry_method == ACPI_CSTATE_FFH) {
/* Call into architectural FFH based C-state */ /* Call into architectural FFH based C-state */
acpi_processor_ffh_cstate_enter(cstate); acpi_processor_ffh_cstate_enter(cstate);
@ -284,6 +286,7 @@ static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
gets asserted in time to freeze execution properly. */ gets asserted in time to freeze execution properly. */
unused = inl(acpi_gbl_FADT.xpm_timer_block.address); unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
} }
start_critical_timings();
} }
#endif /* !CONFIG_CPU_IDLE */ #endif /* !CONFIG_CPU_IDLE */
@ -1418,6 +1421,8 @@ static inline void acpi_idle_update_bm_rld(struct acpi_processor *pr,
*/ */
static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
{ {
/* Don't trace irqs off for idle */
stop_critical_timings();
if (cx->entry_method == ACPI_CSTATE_FFH) { if (cx->entry_method == ACPI_CSTATE_FFH) {
/* Call into architectural FFH based C-state */ /* Call into architectural FFH based C-state */
acpi_processor_ffh_cstate_enter(cx); acpi_processor_ffh_cstate_enter(cx);
@ -1432,6 +1437,7 @@ static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
gets asserted in time to freeze execution properly. */ gets asserted in time to freeze execution properly. */
unused = inl(acpi_gbl_FADT.xpm_timer_block.address); unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
} }
start_critical_timings();
} }
/** /**