[PATCH 4/4] ACPI: PM: Avoid cache flush on entering S4

Kirill A. Shutemov
2021-12-06T12:30:22Z

According to the ACPI spec v6.4, section 16.2 the cache flushing
required on entering to S1, S2, and S3.

No need to flush caches on hibernation (S4).

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
drivers/acpi/sleep.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 14e8df0ac762..8166d863ed6b 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -902,8 +902,6 @@ 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 */
--
2.32.0