163e76cc6e
Add independent irq stacks for percpu to prevent kernel stack overflows. It is also compatible with VMAP_STACK by arch_alloc_vmap_stack. Tested-by: Jisheng Zhang <jszhang@kernel.org> Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org> Cc: Clément Léger <cleger@rivosinc.com> Link: https://lore.kernel.org/r/20230614013018.2168426-2-guoren@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
31 lines
747 B
C
31 lines
747 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_RISCV_IRQ_STACK_H
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#define _ASM_RISCV_IRQ_STACK_H
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#include <linux/bug.h>
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#include <linux/gfp.h>
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#include <linux/kconfig.h>
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#include <linux/vmalloc.h>
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#include <linux/pgtable.h>
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#include <asm/thread_info.h>
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DECLARE_PER_CPU(ulong *, irq_stack_ptr);
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#ifdef CONFIG_VMAP_STACK
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/*
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* To ensure that VMAP'd stack overflow detection works correctly, all VMAP'd
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* stacks need to have the same alignment.
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*/
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static inline unsigned long *arch_alloc_vmap_stack(size_t stack_size, int node)
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{
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void *p;
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p = __vmalloc_node(stack_size, THREAD_ALIGN, THREADINFO_GFP, node,
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__builtin_return_address(0));
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return kasan_reset_tag(p);
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}
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#endif /* CONFIG_VMAP_STACK */
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#endif /* _ASM_RISCV_IRQ_STACK_H */
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