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Wyes Karny 92b465c5fe x86: Handle idle=nomwait cmdline properly for x86_idle 
[ Upstream commit 8bcedb4ce0 ]

When kernel is booted with idle=nomwait do not use MWAIT as the
default idle state.

If the user boots the kernel with idle=nomwait, it is a clear
direction to not use mwait as the default idle state.
However, the current code does not take this into consideration
while selecting the default idle state on x86.

Fix it by checking for the idle=nomwait boot option in
prefer_mwait_c1_over_halt().

Also update the documentation around idle=nomwait appropriately.

[ dhansen: tweak commit message ]

Signed-off-by: Wyes Karny <wyes.karny@amd.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Tested-by: Zhang Rui <rui.zhang@intel.com>
Link: https://lkml.kernel.org/r/fdc2dc2d0a1bc21c2f53d989ea2d2ee3ccbc0dbe.1654538381.git-series.wyes.karny@amd.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2022-08-17 15:13:59 +02:00
..
amd-pstate.rst Merge branch 'pm-docs' 2022-03-29 18:53:28 +02:00
cpufreq.rst docs: remove some replace macros like |struct foo| 2020-10-15 07:49:40 +02:00
cpufreq_drivers.rst Documentation: cpufreq: Move legacy driver documentation 2020-03-02 11:31:06 +01:00
cpuidle.rst x86: Handle idle=nomwait cmdline properly for x86_idle 2022-08-17 15:13:59 +02:00
index.rst Documentation: PM: Add SPDX license tags to multiple files 2019-04-08 12:57:47 +02:00
intel-speed-select.rst Documentation: admin-guide: PM: Add Out of Band mode 2022-05-25 15:48:26 +02:00
intel_epb.rst admin-guide: pm: intel_epb: Add SPDX license tag and copyright notice 2019-04-08 12:59:09 +02:00
intel_idle.rst docs: admin-guide: pm: avoid using ReST :doc:foo markup 2021-06-17 13:24:36 -06:00
intel_pstate.rst Power management updates for 5.14-rc1 2021-06-29 13:36:06 -07:00
intel_uncore_frequency_scaling.rst Documentation: admin-guide: pm: Document uncore frequency scaling 2022-03-01 16:46:53 +01:00
sleep-states.rst Documentation: admin-guide: PM: Update sleep states documentation 2020-02-03 11:58:26 +01:00
strategies.rst Documentation: PM: Unify copyright notices 2019-04-08 12:57:47 +02:00
suspend-flows.rst Documentation: PM: sleep: Document system-wide suspend code flows 2020-04-03 11:41:01 +02:00
system-wide.rst Documentation: PM: sleep: Document system-wide suspend code flows 2020-04-03 11:41:01 +02:00
working-state.rst Documentation: admin-guide: pm: Document uncore frequency scaling 2022-03-01 16:46:53 +01:00