x86: Handle idle=nomwait cmdline properly for x86_idle
[ Upstream commit 8bcedb4c ] 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>
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