x86/softirq/64: Inline do_softirq_own_stack()

There is no reason to have this as a seperate function for a single caller.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210210002513.382806685@linutronix.de

arch/x86/include/asm/irq_stack.h

@@ -194,7 +194,7 @@
  * interrupts are pending to be processed. The interrupt stack cannot be in
  * use here.
  */
-#define run_softirq_on_irqstack()					\
+#define do_softirq_own_stack()						\
 {									\
 	__this_cpu_write(hardirq_stack_inuse, true);			\
 	call_on_irqstack(__do_softirq, ASM_CALL_SOFTIRQ);		\
@@ -202,7 +202,6 @@
 }
 
 #else /* CONFIG_X86_64 */
-
 /* System vector handlers always run on the stack they interrupted. */
 #define run_sysvec_on_irqstack_cond(func, regs)				\
 {									\

arch/x86/include/asm/softirq_stack.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_SOFTIRQ_STACK_H
+#define _ASM_X86_SOFTIRQ_STACK_H
+
+#ifdef CONFIG_X86_64
+# include <asm/irq_stack.h>
+#else
+# include <asm-generic/softirq_stack.h>
+#endif
+
+#endif

arch/x86/kernel/irq_64.c

@@ -74,8 +74,3 @@ int irq_init_percpu_irqstack(unsigned int cpu)
 		return 0;
 	return map_irq_stack(cpu);
 }
-
-void do_softirq_own_stack(void)
-{
-	run_softirq_on_irqstack();
-}