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arm64/cpu: Mark cpu_park_loop() and friends __noreturn 

In preparation for marking panic_smp_self_stop() __noreturn across the
kernel, first mark the arm64 implementation of cpu_park_loop() and
related functions __noreturn.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/55787d3193ea3e295ccbb097abfab0a10ae49d45.1681342859.git.jpoimboe@kernel.org
This commit is contained in:
Josh Poimboeuf 2023-04-12 16:49:34 -07:00 committed by Peter Zijlstra
parent 4208d2d798
commit 5ab6876c78
5 changed files with 12 additions and 11 deletions
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4
arch/arm64/include/asm/exception.h
View File

@ -31,7 +31,7 @@ static inline unsigned long disr_to_esr(u64 disr)
return esr;
}
asmlinkage void handle_bad_stack(struct pt_regs *regs);
asmlinkage void __noreturn handle_bad_stack(struct pt_regs *regs);
asmlinkage void el1t_64_sync_handler(struct pt_regs *regs);
asmlinkage void el1t_64_irq_handler(struct pt_regs *regs);
@ -80,5 +80,5 @@ void do_el1_fpac(struct pt_regs *regs, unsigned long esr);
void do_serror(struct pt_regs *regs, unsigned long esr);
void do_notify_resume(struct pt_regs *regs, unsigned long thread_flags);
void panic_bad_stack(struct pt_regs *regs, unsigned long esr, unsigned long far);
void __noreturn panic_bad_stack(struct pt_regs *regs, unsigned long esr, unsigned long far);
#endif /* __ASM_EXCEPTION_H */

6
arch/arm64/include/asm/smp.h
View File

@ -101,9 +101,9 @@ extern int __cpu_disable(void);
extern void __cpu_die(unsigned int cpu);
extern void __noreturn cpu_die(void);
extern void cpu_die_early(void);
extern void __noreturn cpu_die_early(void);
static inline void cpu_park_loop(void)
static inline void __noreturn cpu_park_loop(void)
{
for (;;) {
wfe();
@ -123,7 +123,7 @@ static inline void update_cpu_boot_status(int val)
* which calls for a kernel panic. Update the boot status and park the calling
* CPU.
*/
static inline void cpu_panic_kernel(void)
static inline void __noreturn cpu_panic_kernel(void)
{
update_cpu_boot_status(CPU_PANIC_KERNEL);
cpu_park_loop();

2
arch/arm64/kernel/entry-common.c
View File

@ -840,7 +840,7 @@ UNHANDLED(el0t, 32, error)
#endif /* CONFIG_COMPAT */
#ifdef CONFIG_VMAP_STACK
asmlinkage void noinstr handle_bad_stack(struct pt_regs *regs)
asmlinkage void noinstr __noreturn handle_bad_stack(struct pt_regs *regs)
{
unsigned long esr = read_sysreg(esr_el1);
unsigned long far = read_sysreg(far_el1);

8
arch/arm64/kernel/smp.c
View File

@ -398,7 +398,7 @@ static void __cpu_try_die(int cpu)
* Kill the calling secondary CPU, early in bringup before it is turned
* online.
*/
void cpu_die_early(void)
void __noreturn cpu_die_early(void)
{
int cpu = smp_processor_id();
@ -816,7 +816,7 @@ void arch_irq_work_raise(void)
}
#endif
static void local_cpu_stop(void)
static void __noreturn local_cpu_stop(void)
{
set_cpu_online(smp_processor_id(), false);
@ -839,7 +839,7 @@ void panic_smp_self_stop(void)
static atomic_t waiting_for_crash_ipi = ATOMIC_INIT(0);
#endif
static void ipi_cpu_crash_stop(unsigned int cpu, struct pt_regs *regs)
static void __noreturn ipi_cpu_crash_stop(unsigned int cpu, struct pt_regs *regs)
{
#ifdef CONFIG_KEXEC_CORE
crash_save_cpu(regs, cpu);
@ -854,6 +854,8 @@ static void ipi_cpu_crash_stop(unsigned int cpu, struct pt_regs *regs)
/* just in case */
cpu_park_loop();
#else
BUG();
#endif
}

3
arch/arm64/kernel/traps.c
View File

@ -863,7 +863,7 @@ void bad_el0_sync(struct pt_regs *regs, int reason, unsigned long esr)
DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack)
__aligned(16);
void panic_bad_stack(struct pt_regs *regs, unsigned long esr, unsigned long far)
void __noreturn panic_bad_stack(struct pt_regs *regs, unsigned long esr, unsigned long far)
{
unsigned long tsk_stk = (unsigned long)current->stack;
unsigned long irq_stk = (unsigned long)this_cpu_read(irq_stack_ptr);
@ -905,7 +905,6 @@ void __noreturn arm64_serror_panic(struct pt_regs *regs, unsigned long esr)
nmi_panic(regs, "Asynchronous SError Interrupt");
cpu_park_loop();
unreachable();
}
bool arm64_is_fatal_ras_serror(struct pt_regs *regs, unsigned long esr)