powerpc/64: hard disable irqs on the panic()ing CPU

Similar to previous patches, hard disable interrupts when a CPU is
in panic. This reduces the chance the watchdog has to interfere with
the panic, and avoids any other type of masked interrupt being
executed when crashing which minimises the length of the crash path.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 62b1a40d895777a10b3c7279fde05583ae3dc66b..40b44bb53a4efbb8b25c64786262e0123a3da640 100644 (file)
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -700,12 +700,19 @@ EXPORT_SYMBOL(check_legacy_ioport);
 static int ppc_panic_event(struct notifier_block *this,
                              unsigned long event, void *ptr)
 {
+       /*
+        * panic does a local_irq_disable, but we really
+        * want interrupts to be hard disabled.
+        */
+       hard_irq_disable();
+
        /*
         * If firmware-assisted dump has been registered then trigger
         * firmware-assisted dump and let firmware handle everything else.
         */
        crash_fadump(NULL, ptr);
-       ppc_md.panic(ptr);  /* May not return */
+       if (ppc_md.panic)
+               ppc_md.panic(ptr);  /* May not return */
        return NOTIFY_DONE;
 }
 
@@ -716,7 +723,8 @@ static struct notifier_block ppc_panic_block = {
 
 void __init setup_panic(void)
 {
-       if (!ppc_md.panic)
+       /* PPC64 always does a hard irq disable in its panic handler */
+       if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic)
                return;
        atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 }