Commit ed8b20d4 authored by James Morse's avatar James Morse Committed by Catalin Marinas

arm64: Add vmap_stack header file

Today the arm64 arch code allocates an extra IRQ stack per-cpu. If we
also have SDEI and VMAP stacks we need two extra per-cpu VMAP stacks.

Move the VMAP stack allocation out to a helper in a new header file.
This avoids missing THREADINFO_GFP, or getting the all-important alignment
wrong.
Signed-off-by: default avatarJames Morse <james.morse@arm.com>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Reviewed-by: default avatarMark Rutland <mark.rutland@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent ad6eb31e
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2017 Arm Ltd.
#ifndef __ASM_VMAP_STACK_H
#define __ASM_VMAP_STACK_H
#include <linux/bug.h>
#include <linux/gfp.h>
#include <linux/kconfig.h>
#include <linux/vmalloc.h>
#include <asm/memory.h>
#include <asm/pgtable.h>
#include <asm/thread_info.h>
/*
* To ensure that VMAP'd stack overflow detection works correctly, all VMAP'd
* stacks need to have the same alignment.
*/
static inline unsigned long *arch_alloc_vmap_stack(size_t stack_size, int node)
{
BUILD_BUG_ON(!IS_ENABLED(CONFIG_VMAP_STACK));
return __vmalloc_node_range(stack_size, THREAD_ALIGN,
VMALLOC_START, VMALLOC_END,
THREADINFO_GFP, PAGE_KERNEL, 0, node,
__builtin_return_address(0));
}
#endif /* __ASM_VMAP_STACK_H */
......@@ -29,6 +29,7 @@
#include <linux/irqchip.h>
#include <linux/seq_file.h>
#include <linux/vmalloc.h>
#include <asm/vmap_stack.h>
unsigned long irq_err_count;
......@@ -58,17 +59,7 @@ static void init_irq_stacks(void)
unsigned long *p;
for_each_possible_cpu(cpu) {
/*
* To ensure that VMAP'd stack overflow detection works
* correctly, the IRQ stacks need to have the same
* alignment as other stacks.
*/
p = __vmalloc_node_range(IRQ_STACK_SIZE, THREAD_ALIGN,
VMALLOC_START, VMALLOC_END,
THREADINFO_GFP, PAGE_KERNEL,
0, cpu_to_node(cpu),
__builtin_return_address(0));
p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, cpu_to_node(cpu));
per_cpu(irq_stack_ptr, cpu) = p;
}
}
......
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