linux-kernel - [tip: sched/core] acpi

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Date:   Fri, 13 Jan 2023 12:31:13 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Frederic Weisbecker <frederic@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] acpi_idle: Remove tracing

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     8ce78470bf2dd1d08107736e813fa62e09aa4647
Gitweb:        https://git.kernel.org/tip/8ce78470bf2dd1d08107736e813fa62e09aa4647
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Thu, 12 Jan 2023 20:43:29 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Fri, 13 Jan 2023 11:48:15 +01:00

acpi_idle: Remove tracing

All the idle routines are called with RCU disabled, as such there must
not be any tracing inside.

While there; clean-up the io-port idle thing.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Tested-by: Tony Lindgren <tony@...mide.com>
Tested-by: Ulf Hansson <ulf.hansson@...aro.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Acked-by: Frederic Weisbecker <frederic@...nel.org>
Link: https://lore.kernel.org/r/20230112195540.251666856@infradead.org
---
 drivers/acpi/processor_idle.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index a589cfa..48fcd28 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -109,8 +109,8 @@ static const struct dmi_system_id processor_power_dmi_table[] = {
 static void __cpuidle acpi_safe_halt(void)
 {
 	if (!tif_need_resched()) {
-		safe_halt();
-		local_irq_disable();
+		raw_safe_halt();
+		raw_local_irq_disable();
 	}
 }
 
@@ -523,8 +523,11 @@ static int acpi_idle_bm_check(void)
 	return bm_status;
 }
 
-static void wait_for_freeze(void)
+static __cpuidle void io_idle(unsigned long addr)
 {
+	/* IO port based C-state */
+	inb(addr);
+
 #ifdef	CONFIG_X86
 	/* No delay is needed if we are in guest */
 	if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
@@ -569,9 +572,7 @@ static void __cpuidle acpi_idle_do_entry(struct acpi_processor_cx *cx)
 	} else if (cx->entry_method == ACPI_CSTATE_HALT) {
 		acpi_safe_halt();
 	} else {
-		/* IO port based C-state */
-		inb(cx->address);
-		wait_for_freeze();
+		io_idle(cx->address);
 	}
 
 	perf_lopwr_cb(false);
@@ -593,8 +594,7 @@ static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
 		if (cx->entry_method == ACPI_CSTATE_HALT)
 			safe_halt();
 		else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) {
-			inb(cx->address);
-			wait_for_freeze();
+			io_idle(cx->address);
 		} else
 			return -ENODEV;