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arm64: panic from init_IRQ if IRQ handler stacks cannot be allocated

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init_irq_stacks() and init_irq_scs() may fail when arch_alloc_vmap_stack
or scs_alloc return NULL. Return -ENOMEM from both and call panic() once
from init_IRQ(), covering per-CPU IRQ stacks and shadow IRQ stacks
consistently.

Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Osama Abdelkader
2026-03-26 23:57:52 +01:00
committed by Will Deacon
parent e7cec385d2
commit 7dc6922f7f
1 changed files with 20 additions and 9 deletions
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29
arch/arm64/kernel/irq.c
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@@ -10,6 +10,7 @@
* Copyright (C) 2012 ARM Ltd.
*/
#include <linux/errno.h>
#include <linux/hardirq.h>
#include <linux/init.h>
#include <linux/irq.h>
@@ -32,34 +33,43 @@ DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts);
DEFINE_PER_CPU(unsigned long *, irq_stack_ptr);
DECLARE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr);
#ifdef CONFIG_SHADOW_CALL_STACK
DEFINE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr);
#endif
static void init_irq_scs(void)
static int __init init_irq_scs(void)
{
int cpu;
void *s;
if (!scs_is_enabled())
return;
return 0;
for_each_possible_cpu(cpu)
per_cpu(irq_shadow_call_stack_ptr, cpu) =
scs_alloc(early_cpu_to_node(cpu));
for_each_possible_cpu(cpu) {
s = scs_alloc(early_cpu_to_node(cpu));
if (!s)
return -ENOMEM;
per_cpu(irq_shadow_call_stack_ptr, cpu) = s;
}
return 0;
}
static void __init init_irq_stacks(void)
static int __init init_irq_stacks(void)
{
int cpu;
unsigned long *p;
for_each_possible_cpu(cpu) {
p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, early_cpu_to_node(cpu));
if (!p)
return -ENOMEM;
per_cpu(irq_stack_ptr, cpu) = p;
}
return 0;
}
#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
@@ -109,8 +119,9 @@ int __init set_handle_fiq(void (*handle_fiq)(struct pt_regs *))
void __init init_IRQ(void)
{
init_irq_stacks();
init_irq_scs();
if (init_irq_stacks() || init_irq_scs())
panic("Failed to allocate IRQ stack resources\n");
irqchip_init();
if (system_uses_irq_prio_masking()) {