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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 <kirill.shutemov@linux.intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Kirill A. Shutemov 2021-12-06 15:29:52 +03:00 committed by Rafael J. Wysocki
parent 0fcfb00b28
commit 53d01e2016
1 changed files with 0 additions and 2 deletions
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2
drivers/acpi/sleep.c
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@ -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 */