mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-11 11:09:13 +00:00
68db0cf106
We are going to split <linux/sched/task_stack.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/task_stack.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/crash_dump.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/types.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/sched/task_stack.h>
|
|
|
|
/* This keeps a track of which one is crashing cpu. */
|
|
static int crashing_cpu = -1;
|
|
static cpumask_t cpus_in_crash = CPU_MASK_NONE;
|
|
|
|
#ifdef CONFIG_SMP
|
|
static void crash_shutdown_secondary(void *passed_regs)
|
|
{
|
|
struct pt_regs *regs = passed_regs;
|
|
int cpu = smp_processor_id();
|
|
|
|
/*
|
|
* If we are passed registers, use those. Otherwise get the
|
|
* regs from the last interrupt, which should be correct, as
|
|
* we are in an interrupt. But if the regs are not there,
|
|
* pull them from the top of the stack. They are probably
|
|
* wrong, but we need something to keep from crashing again.
|
|
*/
|
|
if (!regs)
|
|
regs = get_irq_regs();
|
|
if (!regs)
|
|
regs = task_pt_regs(current);
|
|
|
|
if (!cpu_online(cpu))
|
|
return;
|
|
|
|
local_irq_disable();
|
|
if (!cpumask_test_cpu(cpu, &cpus_in_crash))
|
|
crash_save_cpu(regs, cpu);
|
|
cpumask_set_cpu(cpu, &cpus_in_crash);
|
|
|
|
while (!atomic_read(&kexec_ready_to_reboot))
|
|
cpu_relax();
|
|
relocated_kexec_smp_wait(NULL);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static void crash_kexec_prepare_cpus(void)
|
|
{
|
|
static int cpus_stopped;
|
|
unsigned int msecs;
|
|
unsigned int ncpus;
|
|
|
|
if (cpus_stopped)
|
|
return;
|
|
|
|
ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
|
|
|
|
smp_call_function(crash_shutdown_secondary, NULL, 0);
|
|
smp_wmb();
|
|
|
|
/*
|
|
* The crash CPU sends an IPI and wait for other CPUs to
|
|
* respond. Delay of at least 10 seconds.
|
|
*/
|
|
pr_emerg("Sending IPI to other cpus...\n");
|
|
msecs = 10000;
|
|
while ((cpumask_weight(&cpus_in_crash) < ncpus) && (--msecs > 0)) {
|
|
cpu_relax();
|
|
mdelay(1);
|
|
}
|
|
|
|
cpus_stopped = 1;
|
|
}
|
|
|
|
/* Override the weak function in kernel/panic.c */
|
|
void crash_smp_send_stop(void)
|
|
{
|
|
if (_crash_smp_send_stop)
|
|
_crash_smp_send_stop();
|
|
|
|
crash_kexec_prepare_cpus();
|
|
}
|
|
|
|
#else /* !defined(CONFIG_SMP) */
|
|
static void crash_kexec_prepare_cpus(void) {}
|
|
#endif /* !defined(CONFIG_SMP) */
|
|
|
|
void default_machine_crash_shutdown(struct pt_regs *regs)
|
|
{
|
|
local_irq_disable();
|
|
crashing_cpu = smp_processor_id();
|
|
crash_save_cpu(regs, crashing_cpu);
|
|
crash_kexec_prepare_cpus();
|
|
cpumask_set_cpu(crashing_cpu, &cpus_in_crash);
|
|
}
|