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34a6980c82
Under CONFIG_DEBUG_PREEMPT=y, this_cpu_ptr() ends up calling back into
raw_smp_processor_id(), resulting in some hilariously catastrophic
infinite recursion. In the normal case, we have:
#define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
and everything is dandy. However for CONFIG_DEBUG_PREEMPT, this_cpu_ptr()
is defined in terms of my_cpu_offset, wherein the fun begins:
#define my_cpu_offset per_cpu_offset(smp_processor_id())
...
#define smp_processor_id() debug_smp_processor_id()
...
notrace unsigned int debug_smp_processor_id(void)
{
return check_preemption_disabled("smp_processor_id", "");
...
notrace static unsigned int check_preemption_disabled(const char *what1,
const char *what2)
{
int this_cpu = raw_smp_processor_id();
and bang. Use raw_cpu_ptr() directly to avoid that.
Fixes: 57c82954e7 ("arm64: make cpu number a percpu variable")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
154 lines
4.1 KiB
C
154 lines
4.1 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_SMP_H
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#define __ASM_SMP_H
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/* Values for secondary_data.status */
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#define CPU_MMU_OFF (-1)
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#define CPU_BOOT_SUCCESS (0)
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/* The cpu invoked ops->cpu_die, synchronise it with cpu_kill */
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#define CPU_KILL_ME (1)
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/* The cpu couldn't die gracefully and is looping in the kernel */
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#define CPU_STUCK_IN_KERNEL (2)
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/* Fatal system error detected by secondary CPU, crash the system */
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#define CPU_PANIC_KERNEL (3)
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#ifndef __ASSEMBLY__
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#include <asm/percpu.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/thread_info.h>
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DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);
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/*
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* We don't use this_cpu_read(cpu_number) as that has implicit writes to
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* preempt_count, and associated (compiler) barriers, that we'd like to avoid
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* the expense of. If we're preemptible, the value can be stale at use anyway.
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* And we can't use this_cpu_ptr() either, as that winds up recursing back
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* here under CONFIG_DEBUG_PREEMPT=y.
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*/
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#define raw_smp_processor_id() (*raw_cpu_ptr(&cpu_number))
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struct seq_file;
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/*
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* generate IPI list text
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*/
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extern void show_ipi_list(struct seq_file *p, int prec);
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/*
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* Called from C code, this handles an IPI.
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*/
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extern void handle_IPI(int ipinr, struct pt_regs *regs);
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/*
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* Discover the set of possible CPUs and determine their
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* SMP operations.
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*/
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extern void smp_init_cpus(void);
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/*
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* Provide a function to raise an IPI cross call on CPUs in callmap.
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*/
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extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
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extern void (*__smp_cross_call)(const struct cpumask *, unsigned int);
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/*
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* Called from the secondary holding pen, this is the secondary CPU entry point.
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*/
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asmlinkage void secondary_start_kernel(void);
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/*
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* Initial data for bringing up a secondary CPU.
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* @stack - sp for the secondary CPU
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* @status - Result passed back from the secondary CPU to
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* indicate failure.
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*/
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struct secondary_data {
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void *stack;
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struct task_struct *task;
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long status;
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};
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extern struct secondary_data secondary_data;
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extern long __early_cpu_boot_status;
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extern void secondary_entry(void);
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extern void arch_send_call_function_single_ipi(int cpu);
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extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
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#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
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extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
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#else
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static inline void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
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{
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BUILD_BUG();
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}
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#endif
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extern int __cpu_disable(void);
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extern void __cpu_die(unsigned int cpu);
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extern void cpu_die(void);
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extern void cpu_die_early(void);
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static inline void cpu_park_loop(void)
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{
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for (;;) {
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wfe();
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wfi();
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}
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}
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static inline void update_cpu_boot_status(int val)
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{
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WRITE_ONCE(secondary_data.status, val);
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/* Ensure the visibility of the status update */
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dsb(ishst);
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}
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/*
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* The calling secondary CPU has detected serious configuration mismatch,
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* which calls for a kernel panic. Update the boot status and park the calling
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* CPU.
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*/
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static inline void cpu_panic_kernel(void)
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{
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update_cpu_boot_status(CPU_PANIC_KERNEL);
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cpu_park_loop();
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}
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/*
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* If a secondary CPU enters the kernel but fails to come online,
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* (e.g. due to mismatched features), and cannot exit the kernel,
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* we increment cpus_stuck_in_kernel and leave the CPU in a
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* quiesecent loop within the kernel text. The memory containing
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* this loop must not be re-used for anything else as the 'stuck'
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* core is executing it.
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*
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* This function is used to inhibit features like kexec and hibernate.
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*/
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bool cpus_are_stuck_in_kernel(void);
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#endif /* ifndef __ASSEMBLY__ */
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#endif /* ifndef __ASM_SMP_H */
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