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2aff7c706c
- Mark arch_cpu_idle_dead() __noreturn, make all architectures & drivers that did
this inconsistently follow this new, common convention, and fix all the fallout
that objtool can now detect statically.
- Fix/improve the ORC unwinder becoming unreliable due to UNWIND_HINT_EMPTY ambiguity,
split it into UNWIND_HINT_END_OF_STACK and UNWIND_HINT_UNDEFINED to resolve it.
- Fix noinstr violations in the KCSAN code and the lkdtm/stackleak code.
- Generate ORC data for __pfx code
- Add more __noreturn annotations to various kernel startup/shutdown/panic functions.
- Misc improvements & fixes.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'objtool-core-2023-04-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull objtool updates from Ingo Molnar:
- Mark arch_cpu_idle_dead() __noreturn, make all architectures &
drivers that did this inconsistently follow this new, common
convention, and fix all the fallout that objtool can now detect
statically
- Fix/improve the ORC unwinder becoming unreliable due to
UNWIND_HINT_EMPTY ambiguity, split it into UNWIND_HINT_END_OF_STACK
and UNWIND_HINT_UNDEFINED to resolve it
- Fix noinstr violations in the KCSAN code and the lkdtm/stackleak code
- Generate ORC data for __pfx code
- Add more __noreturn annotations to various kernel startup/shutdown
and panic functions
- Misc improvements & fixes
* tag 'objtool-core-2023-04-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (52 commits)
x86/hyperv: Mark hv_ghcb_terminate() as noreturn
scsi: message: fusion: Mark mpt_halt_firmware() __noreturn
x86/cpu: Mark {hlt,resume}_play_dead() __noreturn
btrfs: Mark btrfs_assertfail() __noreturn
objtool: Include weak functions in global_noreturns check
cpu: Mark nmi_panic_self_stop() __noreturn
cpu: Mark panic_smp_self_stop() __noreturn
arm64/cpu: Mark cpu_park_loop() and friends __noreturn
x86/head: Mark *_start_kernel() __noreturn
init: Mark start_kernel() __noreturn
init: Mark [arch_call_]rest_init() __noreturn
objtool: Generate ORC data for __pfx code
x86/linkage: Fix padding for typed functions
objtool: Separate prefix code from stack validation code
objtool: Remove superfluous dead_end_function() check
objtool: Add symbol iteration helpers
objtool: Add WARN_INSN()
scripts/objdump-func: Support multiple functions
context_tracking: Fix KCSAN noinstr violation
objtool: Add stackleak instrumentation to uaccess safe list
...
85 lines
1.6 KiB
C
85 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 Western Digital Corporation or its affiliates.
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/err.h>
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#include <linux/irq.h>
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#include <linux/cpu.h>
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#include <linux/sched/hotplug.h>
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#include <asm/irq.h>
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#include <asm/cpu_ops.h>
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#include <asm/numa.h>
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#include <asm/smp.h>
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bool cpu_has_hotplug(unsigned int cpu)
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{
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if (cpu_ops[cpu]->cpu_stop)
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return true;
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return false;
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}
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/*
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* __cpu_disable runs on the processor to be shutdown.
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*/
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int __cpu_disable(void)
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{
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int ret = 0;
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unsigned int cpu = smp_processor_id();
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if (!cpu_ops[cpu] || !cpu_ops[cpu]->cpu_stop)
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return -EOPNOTSUPP;
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if (cpu_ops[cpu]->cpu_disable)
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ret = cpu_ops[cpu]->cpu_disable(cpu);
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if (ret)
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return ret;
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remove_cpu_topology(cpu);
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numa_remove_cpu(cpu);
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set_cpu_online(cpu, false);
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riscv_ipi_disable();
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irq_migrate_all_off_this_cpu();
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return ret;
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}
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/*
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* Called on the thread which is asking for a CPU to be shutdown.
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*/
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void __cpu_die(unsigned int cpu)
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{
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int ret = 0;
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if (!cpu_wait_death(cpu, 5)) {
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pr_err("CPU %u: didn't die\n", cpu);
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return;
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}
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pr_notice("CPU%u: off\n", cpu);
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/* Verify from the firmware if the cpu is really stopped*/
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if (cpu_ops[cpu]->cpu_is_stopped)
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ret = cpu_ops[cpu]->cpu_is_stopped(cpu);
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if (ret)
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pr_warn("CPU%d may not have stopped: %d\n", cpu, ret);
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}
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/*
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* Called from the idle thread for the CPU which has been shutdown.
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*/
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void __noreturn arch_cpu_idle_dead(void)
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{
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idle_task_exit();
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(void)cpu_report_death();
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cpu_ops[smp_processor_id()]->cpu_stop();
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/* It should never reach here */
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BUG();
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}
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