mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
powerpc: use NMI IPI for smp_send_stop
Use the NMI IPI rather than smp_call_function for smp_send_stop. Have stopped CPUs hard disable interrupts rather than just soft disable. This function is used in crash/panic/shutdown paths to bring other CPUs down as quickly and reliably as possible, and minimizing their potential to cause trouble. Avoiding the Linux smp_call_function infrastructure and (if supported) using true NMI IPIs makes this more robust. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
parent
a2b5e056b7
commit
6bed323762
@ -565,7 +565,11 @@ void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_NMI_IPI
|
||||
static void stop_this_cpu(struct pt_regs *regs)
|
||||
#else
|
||||
static void stop_this_cpu(void *dummy)
|
||||
#endif
|
||||
{
|
||||
/* Remove this CPU */
|
||||
set_cpu_online(smp_processor_id(), false);
|
||||
@ -577,7 +581,11 @@ static void stop_this_cpu(void *dummy)
|
||||
|
||||
void smp_send_stop(void)
|
||||
{
|
||||
#ifdef CONFIG_NMI_IPI
|
||||
smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, stop_this_cpu, 1000000);
|
||||
#else
|
||||
smp_call_function(stop_this_cpu, NULL, 0);
|
||||
#endif
|
||||
}
|
||||
|
||||
struct thread_info *current_set[NR_CPUS];
|
||||
|
Loading…
Reference in New Issue
Block a user