diff options
Diffstat (limited to 'arch/parisc/kernel/toc.c')
| -rw-r--r-- | arch/parisc/kernel/toc.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/arch/parisc/kernel/toc.c b/arch/parisc/kernel/toc.c index 18327611cf8f..e4b48d07afbd 100644 --- a/arch/parisc/kernel/toc.c +++ b/arch/parisc/kernel/toc.c @@ -9,8 +9,11 @@ #include <asm/pdc.h> #include <asm/pdc_chassis.h> +#include <asm/ldcw.h> +#include <asm/processor.h> -unsigned int __aligned(16) toc_lock = 1; +static unsigned int __aligned(16) toc_lock = 1; +DEFINE_PER_CPU_PAGE_ALIGNED(char [16384], toc_stack) __visible; static void toc20_to_pt_regs(struct pt_regs *regs, struct pdc_toc_pim_20 *toc) { @@ -63,7 +66,8 @@ void notrace __noreturn __cold toc_intr(struct pt_regs *regs) struct pdc_toc_pim_20 pim_data20; struct pdc_toc_pim_11 pim_data11; - nmi_enter(); + /* verify we wrote regs to the correct stack */ + BUG_ON(regs != (struct pt_regs *)&per_cpu(toc_stack, raw_smp_processor_id())); if (boot_cpu_data.cpu_type >= pcxu) { if (pdc_pim_toc20(&pim_data20)) @@ -76,14 +80,25 @@ void notrace __noreturn __cold toc_intr(struct pt_regs *regs) } #ifdef CONFIG_KGDB + nmi_enter(); + if (atomic_read(&kgdb_active) != -1) kgdb_nmicallback(raw_smp_processor_id(), regs); kgdb_handle_exception(9, SIGTRAP, 0, regs); #endif + + /* serialize output, otherwise all CPUs write backtrace at once */ + while (__ldcw(&toc_lock) == 0) + ; /* wait */ show_regs(regs); + toc_lock = 1; /* release lock for next CPU */ + + if (raw_smp_processor_id() != 0) + while (1) ; /* all but monarch CPU will wait endless. */ /* give other CPUs time to show their backtrace */ mdelay(2000); + machine_restart("TOC"); /* should never reach this */ |