x86/irq/64: Rename irq_stack_ptr to hardirq_stack_ptr

Preparatory patch to share code with 32bit.

No functional changes.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
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: Jiri Kosina <jkosina@suse.cz>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Nicolai Stange <nstange@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Pingfan Liu <kernelfans@gmail.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190414160145.912584074@linutronix.de

arch/x86/entry/entry_64.S

@@ -431,7 +431,7 @@ END(irq_entries_start)
 	 */
 
 	movq	\old_rsp, PER_CPU_VAR(irq_stack_union + IRQ_STACK_SIZE - 8)
-	movq	PER_CPU_VAR(irq_stack_ptr), %rsp
+	movq	PER_CPU_VAR(hardirq_stack_ptr), %rsp
 
 #ifdef CONFIG_DEBUG_ENTRY
 	/*

arch/x86/include/asm/processor.h

@@ -396,7 +396,7 @@ static inline unsigned long cpu_kernelmode_gs_base(int cpu)
 	return (unsigned long)per_cpu(irq_stack_union.gs_base, cpu);
 }
 
-DECLARE_PER_CPU(char *, irq_stack_ptr);
+DECLARE_PER_CPU(char *, hardirq_stack_ptr);
 DECLARE_PER_CPU(unsigned int, irq_count);
 extern asmlinkage void ignore_sysret(void);
 

arch/x86/kernel/cpu/common.c

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

arch/x86/kernel/dumpstack_64.c

@@ -120,7 +120,7 @@ static bool in_exception_stack(unsigned long *stack, struct stack_info *info)
 
 static bool in_irq_stack(unsigned long *stack, struct stack_info *info)
 {
-	unsigned long *end   = (unsigned long *)this_cpu_read(irq_stack_ptr);
+	unsigned long *end   = (unsigned long *)this_cpu_read(hardirq_stack_ptr);
 	unsigned long *begin = end - (IRQ_STACK_SIZE / sizeof(long));
 
 	/*

arch/x86/kernel/irq_64.c

@@ -56,7 +56,7 @@ static inline void stack_overflow_check(struct pt_regs *regs)
 	    regs->sp <= curbase + THREAD_SIZE)
 		return;
 
-	irq_stack_top = (u64)__this_cpu_read(irq_stack_ptr);
+	irq_stack_top = (u64)__this_cpu_read(hardirq_stack_ptr);
 	irq_stack_bottom = irq_stack_top - IRQ_STACK_SIZE + STACK_MARGIN;
 	if (regs->sp >= irq_stack_bottom && regs->sp <= irq_stack_top)
 		return;

arch/x86/kernel/setup_percpu.c

@@ -245,7 +245,7 @@ void __init setup_per_cpu_areas(void)
 			early_per_cpu_map(x86_cpu_to_logical_apicid, cpu);
 #endif
 #ifdef CONFIG_X86_64
-		per_cpu(irq_stack_ptr, cpu) =
+		per_cpu(hardirq_stack_ptr, cpu) =
 			per_cpu(irq_stack_union.irq_stack, cpu) +
 			IRQ_STACK_SIZE;
 #endif