powerpc/traps: Make unrecoverable NMIs die instead of panic

[ Upstream commit 265d6e588d87194c2fe2d6c240247f0264e0c19b ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 3c9457420aee8fc1969f3d0ab82069bc95644714..0f1a888c04a842e81e9f8edb90ead25708dad823 100644 (file)
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -357,11 +357,11 @@ 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 (!nested)
                nmi_exit();
@@ -701,7 +701,7 @@ 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;