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x86/entry/64: Move do_softirq_own_stack() to C

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The first step to get rid of the ENTER/LEAVE_IRQ_STACK ASM macro maze.  Use
the new C code helpers to move do_softirq_own_stack() out of ASM code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20200521202117.870911120@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-05-21 22:05:24 +02:00
parent 931b941459
commit eb6555c839
2 changed files with 6 additions and 13 deletions
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13
arch/x86/entry/entry_64.S
View File

@ -1145,19 +1145,6 @@ SYM_FUNC_START(asm_call_on_stack)
ret ret
SYM_FUNC_END(asm_call_on_stack) SYM_FUNC_END(asm_call_on_stack)
/* Call softirq on interrupt stack. Interrupts are off. */
.pushsection .text, "ax"
SYM_FUNC_START(do_softirq_own_stack)
pushq %rbp
mov %rsp, %rbp
ENTER_IRQ_STACK regs=0 old_rsp=%r11
call __do_softirq
LEAVE_IRQ_STACK regs=0
leaveq
ret
SYM_FUNC_END(do_softirq_own_stack)
.popsection
#ifdef CONFIG_XEN_PV #ifdef CONFIG_XEN_PV
/* /*
* A note on the "critical region" in our callback handler. * A note on the "critical region" in our callback handler.

6
arch/x86/kernel/irq_64.c
View File

@ -20,6 +20,7 @@
#include <linux/sched/task_stack.h> #include <linux/sched/task_stack.h>
#include <asm/cpu_entry_area.h> #include <asm/cpu_entry_area.h>
#include <asm/irq_stack.h>
#include <asm/io_apic.h> #include <asm/io_apic.h>
#include <asm/apic.h> #include <asm/apic.h>
@ -70,3 +71,8 @@ int irq_init_percpu_irqstack(unsigned int cpu)
return 0; return 0;
return map_irq_stack(cpu); return map_irq_stack(cpu);
} }
void do_softirq_own_stack(void)
{
run_on_irqstack_cond(__do_softirq, NULL, NULL);
}