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Commit dcf30997 authored by Steven Rostedt's avatar Steven Rostedt Committed by Ingo Molnar
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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: default avatarSteven Rostedt <srostedt@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 1986b0cb

drivers/acpi/processor_idle.c

+6 −0
Original line number Diff line number Diff line
@@ -272,6 +272,8 @@ static atomic_t c3_cpu_count; 
/* Common C-state entry for C2, C3, .. */

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) {

		/* Call into architectural FFH based C-state */

		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. */

		unused = inl(acpi_gbl_FADT.xpm_timer_block.address);

	}

	start_critical_timings();

}

#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)

{

	/* Don't trace irqs off for idle */

	stop_critical_timings();

	if (cx->entry_method == ACPI_CSTATE_FFH) {

		/* Call into architectural FFH based C-state */

		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. */

		unused = inl(acpi_gbl_FADT.xpm_timer_block.address);

	}

	start_critical_timings();

}



/**