From 53d01e2016d77ff647fb2056c39c67df18ee86bf Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Mon, 6 Dec 2021 15:29:52 +0300 Subject: [PATCH] ACPI: PM: Avoid CPU cache flush when entering S4 According to ACPI 6.4, Section 16.2, the CPU cache flushing is required on entering to S1, S2, and S3. No need to flush the caches during hibernation (S4). Signed-off-by: Kirill A. Shutemov [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki --- drivers/acpi/sleep.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index eaa4775..5bcf82f 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -903,8 +903,6 @@ static int acpi_hibernation_enter(void) { acpi_status status = AE_OK; - ACPI_FLUSH_CPU_CACHE(); - /* This shouldn't return. If it returns, we have a problem */ status = acpi_enter_sleep_state(ACPI_STATE_S4); /* Reprogram control registers */ -- 2.7.4