From: Kirill A. Shutemov Date: Mon, 6 Dec 2021 12:29:52 +0000 (+0300) Subject: ACPI: PM: Avoid CPU cache flush when entering S4 X-Git-Tag: v5.17-rc1~168^2~3^3~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=53d01e2016d77ff647fb2056c39c67df18ee86bf;p=thirdparty%2Fkernel%2Flinux.git 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 --- diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index eaa47753b7584..5bcf82fcb5f3a 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 */