mirror of https://gitee.com/openkylin/linux.git
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
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@ -513,11 +513,11 @@ void system_reset_exception(struct pt_regs *regs)
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#ifdef CONFIG_PPC_BOOK3S_64
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BUG_ON(get_paca()->in_nmi == 0);
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if (get_paca()->in_nmi > 1)
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nmi_panic(regs, "Unrecoverable nested System Reset");
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die("Unrecoverable nested System Reset", regs, SIGABRT);
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#endif
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/* Must die if the interrupt is not recoverable */
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if (!(regs->msr & MSR_RI))
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nmi_panic(regs, "Unrecoverable System Reset");
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die("Unrecoverable System Reset", regs, SIGABRT);
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if (saved_hsrrs) {
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mtspr(SPRN_HSRR0, hsrr0);
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@ -875,7 +875,7 @@ void machine_check_exception(struct pt_regs *regs)
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/* Must die if the interrupt is not recoverable */
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if (!(regs->msr & MSR_RI))
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nmi_panic(regs, "Unrecoverable Machine check");
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die("Unrecoverable Machine check", regs, SIGBUS);
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return;
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