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x86/irq/64: Init hardirq_stack_ptr during CPU hotplug 

Preparatory change for disentangling the irq stack union as a
prerequisite for irq stacks with guard pages.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: "Chang S. Bae" <chang.seok.bae@intel.com>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Nicolai Stange <nstange@suse.de>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: x86-ml <x86@kernel.org>
Cc: Yi Wang <wang.yi59@zte.com.cn>
Link: https://lkml.kernel.org/r/20190414160146.177558566@linutronix.de
This commit is contained in:
Thomas Gleixner 2019-04-14 18:00:05 +02:00 committed by Borislav Petkov
parent 66c7ceb47f
commit 0ac2610420
3 changed files with 16 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/include/asm/irq.h
View File

@ -16,11 +16,7 @@ static inline int irq_canonicalize(int irq)
return ((irq == 2) ? 9 : irq);
}
#ifdef CONFIG_X86_32
extern int irq_init_percpu_irqstack(unsigned int cpu);
#else
static inline int irq_init_percpu_irqstack(unsigned int cpu) { return 0; }
#endif
#define __ARCH_HAS_DO_SOFTIRQ

4
arch/x86/kernel/cpu/common.c
View File

@ -1510,9 +1510,7 @@ DEFINE_PER_CPU(struct task_struct *, current_task) ____cacheline_aligned =
&init_task;
EXPORT_PER_CPU_SYMBOL(current_task);
DEFINE_PER_CPU(char *, hardirq_stack_ptr) =
init_per_cpu_var(irq_stack_union.irq_stack) + IRQ_STACK_SIZE;
DEFINE_PER_CPU(char *, hardirq_stack_ptr);
DEFINE_PER_CPU(unsigned int, irq_count) __visible = -1;
DEFINE_PER_CPU(int, __preempt_count) = INIT_PREEMPT_COUNT;

15
arch/x86/kernel/irq_64.c
View File

@ -87,3 +87,18 @@ bool handle_irq(struct irq_desc *desc, struct pt_regs *regs)
generic_handle_irq_desc(desc);
return true;
}
static int map_irq_stack(unsigned int cpu)
{
void *va = per_cpu_ptr(irq_stack_union.irq_stack, cpu);
per_cpu(hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE;
return 0;
}
int irq_init_percpu_irqstack(unsigned int cpu)
{
if (per_cpu(hardirq_stack_ptr, cpu))
return 0;
return map_irq_stack(cpu);
}