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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_IRQ_STACK_H
#define _ASM_X86_IRQ_STACK_H
#include <linux/ptrace.h>
#include <asm/processor.h>
#ifdef CONFIG_X86_64
static __always_inline bool irqstack_active(void)
{
return __this_cpu_read(irq_count) != -1;
}
void asm_call_on_stack(void *sp, void *func, void *arg);
static __always_inline void __run_on_irqstack(void *func, void *arg)
{
void *tos = __this_cpu_read(hardirq_stack_ptr);
__this_cpu_add(irq_count, 1);
asm_call_on_stack(tos - 8, func, arg);
__this_cpu_sub(irq_count, 1);
}
#else /* CONFIG_X86_64 */
static inline bool irqstack_active(void) { return false; }
static inline void __run_on_irqstack(void *func, void *arg) { }
#endif /* !CONFIG_X86_64 */
static __always_inline bool irq_needs_irq_stack(struct pt_regs *regs)
{
if (IS_ENABLED(CONFIG_X86_32))
return false;
if (!regs)
return !irqstack_active();
return !user_mode(regs) && !irqstack_active();
}
static __always_inline void run_on_irqstack_cond(void *func, void *arg,
struct pt_regs *regs)
{
void (*__func)(void *arg) = func;
lockdep_assert_irqs_disabled();
if (irq_needs_irq_stack(regs))
__run_on_irqstack(__func, arg);
else
__func(arg);
}
#endif
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