linux-kernel - [PATCH] cpu/hotplug: Remove the obsolete CPU hotplug states

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Message-ID: <20231124121615.1604-1-yuzenghui@huawei.com>
Date:   Fri, 24 Nov 2023 20:16:15 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <tglx@...utronix.de>, <peterz@...radead.org>,
        <wanghaibin.wang@...wei.com>, Zenghui Yu <yuzenghui@...wei.com>
Subject: [PATCH] cpu/hotplug: Remove the obsolete CPU hotplug states

There is a bunch of obsolete constants in the cpuhp_state enum that are no
longer used anywhere in the kernel. The oldest one has been unused for over
six years.

Drop all of them to reduce the size of the cpuhp_hp_states array.

  obsolete hotpulg states		introduced in	unused since
  ===================================	=============	============
  CPUHP_X86_APB_DEAD			148b9e2abea6	1b79fc4f2bfd
  CPUHP_MM_DEMOTION_DEAD		a6a0251c6fce	734c15700cdf
  CPUHP_LUSTRE_CFS_DEAD			7b737965b331	be65f9ed267f
  CPUHP_NET_FLOW_PREPARE		a4fc1bfc4206	09c7570480f7
  CPUHP_AP_IRQ_RISCV_STARTING		6b7ce8927b5a	832f15f42646
  CPUHP_AP_MICROCODE_LOADER		78f4e932f776	5af05b8d51a8
  CPUHP_AP_PERF_X86_CQM_STARTING	f07048270423	c39a0e2c8850
  CPUHP_AP_MIPS_OP_LOONGSON3_STARTING	65264e3bc3d4	e258958945c6
  CPUHP_AP_MARCO_TIMER_STARTING		eb0a9d8c672d	446262b27285
  CPUHP_AP_PERF_X86_CQM_ONLINE		f07048270423	c39a0e2c8850
  CPUHP_AP_PERF_X86_IDXD_ONLINE		81dd4d4d6178	never used
  CPUHP_AP_MM_DEMOTION_ONLINE		a6a0251c6fce	734c15700cdf

Signed-off-by: Zenghui Yu <yuzenghui@...wei.com>
---
 include/linux/cpuhotplug.h | 14 --------------
 1 file changed, 14 deletions(-)

diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index efc0c0b07efb..af6c21aab985 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -66,15 +66,12 @@ enum cpuhp_state {
 	CPUHP_PERF_POWER,
 	CPUHP_PERF_SUPERH,
 	CPUHP_X86_HPET_DEAD,
-	CPUHP_X86_APB_DEAD,
 	CPUHP_X86_MCE_DEAD,
 	CPUHP_VIRT_NET_DEAD,
 	CPUHP_IBMVNIC_DEAD,
 	CPUHP_SLUB_DEAD,
 	CPUHP_DEBUG_OBJ_DEAD,
 	CPUHP_MM_WRITEBACK_DEAD,
-	/* Must be after CPUHP_MM_VMSTAT_DEAD */
-	CPUHP_MM_DEMOTION_DEAD,
 	CPUHP_MM_VMSTAT_DEAD,
 	CPUHP_SOFTIRQ_DEAD,
 	CPUHP_NET_MVNETA_DEAD,
@@ -96,7 +93,6 @@ enum cpuhp_state {
 	CPUHP_NET_DEV_DEAD,
 	CPUHP_PCI_XGENE_DEAD,
 	CPUHP_IOMMU_IOVA_DEAD,
-	CPUHP_LUSTRE_CFS_DEAD,
 	CPUHP_AP_ARM_CACHE_B15_RAC_DEAD,
 	CPUHP_PADATA_DEAD,
 	CPUHP_AP_DTPM_CPU_DEAD,
@@ -118,7 +114,6 @@ enum cpuhp_state {
 	CPUHP_XEN_EVTCHN_PREPARE,
 	CPUHP_ARM_SHMOBILE_SCU_PREPARE,
 	CPUHP_SH_SH3X_PREPARE,
-	CPUHP_NET_FLOW_PREPARE,
 	CPUHP_TOPOLOGY_PREPARE,
 	CPUHP_NET_IUCV_PREPARE,
 	CPUHP_ARM_BL_PREPARE,
@@ -151,18 +146,14 @@ enum cpuhp_state {
 	CPUHP_AP_IRQ_ARMADA_XP_STARTING,
 	CPUHP_AP_IRQ_BCM2836_STARTING,
 	CPUHP_AP_IRQ_MIPS_GIC_STARTING,
-	CPUHP_AP_IRQ_RISCV_STARTING,
 	CPUHP_AP_IRQ_LOONGARCH_STARTING,
 	CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
 	CPUHP_AP_ARM_MVEBU_COHERENCY,
-	CPUHP_AP_MICROCODE_LOADER,
 	CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
 	CPUHP_AP_PERF_X86_STARTING,
 	CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
-	CPUHP_AP_PERF_X86_CQM_STARTING,
 	CPUHP_AP_PERF_X86_CSTATE_STARTING,
 	CPUHP_AP_PERF_XTENSA_STARTING,
-	CPUHP_AP_MIPS_OP_LOONGSON3_STARTING,
 	CPUHP_AP_ARM_VFP_STARTING,
 	CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING,
 	CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING,
@@ -179,7 +170,6 @@ enum cpuhp_state {
 	CPUHP_AP_QCOM_TIMER_STARTING,
 	CPUHP_AP_TEGRA_TIMER_STARTING,
 	CPUHP_AP_ARMADA_TIMER_STARTING,
-	CPUHP_AP_MARCO_TIMER_STARTING,
 	CPUHP_AP_MIPS_GIC_TIMER_STARTING,
 	CPUHP_AP_ARC_TIMER_STARTING,
 	CPUHP_AP_RISCV_TIMER_STARTING,
@@ -217,9 +207,7 @@ enum cpuhp_state {
 	CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE,
 	CPUHP_AP_PERF_X86_AMD_POWER_ONLINE,
 	CPUHP_AP_PERF_X86_RAPL_ONLINE,
-	CPUHP_AP_PERF_X86_CQM_ONLINE,
 	CPUHP_AP_PERF_X86_CSTATE_ONLINE,
-	CPUHP_AP_PERF_X86_IDXD_ONLINE,
 	CPUHP_AP_PERF_S390_CF_ONLINE,
 	CPUHP_AP_PERF_S390_SF_ONLINE,
 	CPUHP_AP_PERF_ARM_CCI_ONLINE,
@@ -252,8 +240,6 @@ enum cpuhp_state {
 	CPUHP_AP_BASE_CACHEINFO_ONLINE,
 	CPUHP_AP_ONLINE_DYN,
 	CPUHP_AP_ONLINE_DYN_END		= CPUHP_AP_ONLINE_DYN + 30,
-	/* Must be after CPUHP_AP_ONLINE_DYN for node_states[N_CPU] update */
-	CPUHP_AP_MM_DEMOTION_ONLINE,
 	CPUHP_AP_X86_HPET_ONLINE,
 	CPUHP_AP_X86_KVM_CLK_ONLINE,
 	CPUHP_AP_ACTIVE,
-- 
2.33.0