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@@ -564,6 +564,9 @@ static __init u64 safe_stack_limit(void)
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/* Other BookE, we assume the first GB is bolted */
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return 1ul << 30;
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#else
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+ if (early_radix_enabled())
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+ return ULONG_MAX;
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+
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/* BookS, the first segment is bolted */
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if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
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return 1UL << SID_SHIFT_1T;
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@@ -578,7 +581,8 @@ void __init irqstack_early_init(void)
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/*
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* Interrupt stacks must be in the first segment since we
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- * cannot afford to take SLB misses on them.
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+ * cannot afford to take SLB misses on them. They are not
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+ * accessed in realmode.
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*/
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for_each_possible_cpu(i) {
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softirq_ctx[i] = (struct thread_info *)
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@@ -649,8 +653,9 @@ void __init emergency_stack_init(void)
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* aligned.
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*
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* Since we use these as temporary stacks during secondary CPU
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- * bringup, we need to get at them in real mode. This means they
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- * must also be within the RMO region.
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+ * bringup, machine check, system reset, and HMI, we need to get
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+ * at them in real mode. This means they must also be within the RMO
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+ * region.
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*
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* The IRQ stacks allocated elsewhere in this file are zeroed and
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* initialized in kernel/irq.c. These are initialized here in order
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