mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 01:21:01 +07:00
be1fcde604
Commit9ed0985332("x86: intel_epb: Take CONFIG_PM into account") prevented the majority of the Performance and Energy Bias Hint (EPB) handling code from being built when CONFIG_PM is unset to fix a regression introduced by commitb9c273babc("PM / arch: x86: MSR_IA32_ENERGY_PERF_BIAS sysfs interface"). In hindsight, however, it would be better to skip all of the EPB handling code for CONFIG_PM unset as there really is no reason for it to be there in that case. Namely, if the EPB is not touched by the kernel at all with CONFIG_PM unset, there is no need to worry about modifying the EPB inadvertently on CPU online and since the system will not suspend or hibernate then, there is no need to worry about possible modifications of the EPB by the platform firmware during system-wide PM transitions. For this reason, revert the changes made by commit9ed0985332and only allow intel_epb.o to be built when CONFIG_PM is set. Note that this changes the behavior of the kernels built with CONFIG_PM unset as they will not modify the EPB on boot if it is zero initially any more, so it is not a fix strictly speaking, but users building their kernels with CONFIG_PM unset really should not expect them to take energy efficiency into account. Moreover, if CONFIG_PM is unset for performance reasons, leaving EPB as set initially by the platform firmware will actually be consistent with the user's expectations. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Ingo Molnar <mingo@kernel.org>
62 lines
1.7 KiB
Makefile
62 lines
1.7 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for x86-compatible CPU details, features and quirks
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#
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# Don't trace early stages of a secondary CPU boot
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ifdef CONFIG_FUNCTION_TRACER
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CFLAGS_REMOVE_common.o = -pg
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CFLAGS_REMOVE_perf_event.o = -pg
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endif
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# If these files are instrumented, boot hangs during the first second.
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KCOV_INSTRUMENT_common.o := n
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KCOV_INSTRUMENT_perf_event.o := n
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# Make sure load_percpu_segment has no stackprotector
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nostackp := $(call cc-option, -fno-stack-protector)
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CFLAGS_common.o := $(nostackp)
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obj-y := cacheinfo.o scattered.o topology.o
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obj-y += common.o
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obj-y += rdrand.o
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obj-y += match.o
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obj-y += bugs.o
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obj-y += aperfmperf.o
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obj-y += cpuid-deps.o
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obj-$(CONFIG_PROC_FS) += proc.o
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obj-$(CONFIG_X86_FEATURE_NAMES) += capflags.o powerflags.o
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ifdef CONFIG_CPU_SUP_INTEL
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obj-y += intel.o intel_pconfig.o
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obj-$(CONFIG_PM) += intel_epb.o
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endif
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obj-$(CONFIG_CPU_SUP_AMD) += amd.o
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obj-$(CONFIG_CPU_SUP_HYGON) += hygon.o
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obj-$(CONFIG_CPU_SUP_CYRIX_32) += cyrix.o
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obj-$(CONFIG_CPU_SUP_CENTAUR) += centaur.o
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obj-$(CONFIG_CPU_SUP_TRANSMETA_32) += transmeta.o
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obj-$(CONFIG_CPU_SUP_UMC_32) += umc.o
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obj-$(CONFIG_X86_MCE) += mce/
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obj-$(CONFIG_MTRR) += mtrr/
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obj-$(CONFIG_MICROCODE) += microcode/
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obj-$(CONFIG_X86_CPU_RESCTRL) += resctrl/
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obj-$(CONFIG_X86_LOCAL_APIC) += perfctr-watchdog.o
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obj-$(CONFIG_HYPERVISOR_GUEST) += vmware.o hypervisor.o mshyperv.o
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ifdef CONFIG_X86_FEATURE_NAMES
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quiet_cmd_mkcapflags = MKCAP $@
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cmd_mkcapflags = $(CONFIG_SHELL) $(srctree)/$(src)/mkcapflags.sh $< $@
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cpufeature = $(src)/../../include/asm/cpufeatures.h
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targets += capflags.c
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$(obj)/capflags.c: $(cpufeature) $(src)/mkcapflags.sh FORCE
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$(call if_changed,mkcapflags)
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endif
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clean-files += capflags.c
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