x86/softirq: Move softirq_pending to percpu hot section

No functional change.

Signed-off-by: Brian Gerst <[e-mail]>
Signed-off-by: Ingo Molnar <[e-mail]>
Acked-by: Uros Bizjak <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/x86/include/asm/current.h

···
 	struct task_struct	*current_task;
 	unsigned long		top_of_stack;
 	void			*hardirq_stack_ptr;
-	u16			softirq_pending;
 #ifdef CONFIG_X86_64
 	bool			hardirq_stack_inuse;
 #else

arch/x86/include/asm/hardirq.h

···
 #define _ASM_X86_HARDIRQ_H
 
 #include <linux/threads.h>
-#include <asm/current.h>
 
 typedef struct {
 #if IS_ENABLED(CONFIG_KVM_INTEL)
···
 extern u64 arch_irq_stat(void);
 #define arch_irq_stat		arch_irq_stat
 
-#define local_softirq_pending_ref       pcpu_hot.softirq_pending
+DECLARE_PER_CPU_CACHE_HOT(u16, __softirq_pending);
+#define local_softirq_pending_ref       __softirq_pending
 
 #if IS_ENABLED(CONFIG_KVM_INTEL)
 /*

arch/x86/kernel/irq.c

···
 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
 EXPORT_PER_CPU_SYMBOL(irq_stat);
 
+DEFINE_PER_CPU_CACHE_HOT(u16, __softirq_pending);
+EXPORT_PER_CPU_SYMBOL(__softirq_pending);
+
 atomic_t irq_err_count;
 
 /*