mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-26 19:00:25 +00:00
Code Issues Releases Wiki Activity

ACPI: processor: idle: Only flush cache on entering C3

Browse source 
According to ACPI 6.4, Section 8.2, CPU cache flushing required on
entering the C3 power state.

Avoid flushing the cache on entering other C-states.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Kirill A. Shutemov 2021-12-06 15:29:51 +03:00 committed by Rafael J. Wysocki
parent 0e6078c3c6
commit 87ebbb8c61
1 changed files with 2 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
drivers/acpi/processor_idle.c
View file

@ -565,7 +565,8 @@ static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
{
struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
ACPI_FLUSH_CPU_CACHE();
if (cx->type == ACPI_STATE_C3)
ACPI_FLUSH_CPU_CACHE();
while (1) {