powerpc/traps: Make unrecoverable NMIs die instead of panic

System Reset and Machine Check interrupts that are not recoverable due
to being nested or interrupting when RI=0 currently panic. This is not
necessary, and can often just kill the current context and recover.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Link: https://lore.kernel.org/r/20200508043408.886394-16-npiggin@gmail.com

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index ee209c5a1ad777238f3e8063a67614ffe129972c..477befcda8d3df8329188a4f8183e217c11f0e23 100644 (file)
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -513,11 +513,11 @@ out:
 #ifdef CONFIG_PPC_BOOK3S_64
        BUG_ON(get_paca()->in_nmi == 0);
        if (get_paca()->in_nmi > 1)
-               nmi_panic(regs, "Unrecoverable nested System Reset");
+               die("Unrecoverable nested System Reset", regs, SIGABRT);
 #endif
        /* Must die if the interrupt is not recoverable */
        if (!(regs->msr & MSR_RI))
-               nmi_panic(regs, "Unrecoverable System Reset");
+               die("Unrecoverable System Reset", regs, SIGABRT);
 
        if (saved_hsrrs) {
                mtspr(SPRN_HSRR0, hsrr0);
@@ -875,7 +875,7 @@ void machine_check_exception(struct pt_regs *regs)
 
        /* Must die if the interrupt is not recoverable */
        if (!(regs->msr & MSR_RI))
-               nmi_panic(regs, "Unrecoverable Machine check");
+               die("Unrecoverable Machine check", regs, SIGBUS);
 
        return;