x86/irq/32: Rename hard/softirq_stack to hard/softirq_stack_ptr

The percpu storage holds a pointer to the stack not the stack
itself. Rename it before sharing struct irq_stack with 64-bit.

No functional changes.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
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: Juergen Gross <jgross@suse.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Nicolai Stange <nstange@suse.de>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190414160145.824805922@linutronix.de

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index ff3f469..0b7d866 100644 (file)
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -425,8 +425,8 @@ struct irq_stack {
        char                    stack[IRQ_STACK_SIZE];
 } __aligned(IRQ_STACK_SIZE);
 
-DECLARE_PER_CPU(struct irq_stack *, hardirq_stack);
-DECLARE_PER_CPU(struct irq_stack *, softirq_stack);
+DECLARE_PER_CPU(struct irq_stack *, hardirq_stack_ptr);
+DECLARE_PER_CPU(struct irq_stack *, softirq_stack_ptr);
 #endif /* X86_64 */
 
 extern unsigned int fpu_kernel_xstate_size;

diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index d305440..64a59d7 100644 (file)
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -34,7 +34,7 @@ const char *stack_type_name(enum stack_type type)
 
 static bool in_hardirq_stack(unsigned long *stack, struct stack_info *info)
 {
-       unsigned long *begin = (unsigned long *)this_cpu_read(hardirq_stack);
+       unsigned long *begin = (unsigned long *)this_cpu_read(hardirq_stack_ptr);
        unsigned long *end   = begin + (THREAD_SIZE / sizeof(long));
 
        /*
@@ -59,7 +59,7 @@ static bool in_hardirq_stack(unsigned long *stack, struct stack_info *info)
 
 static bool in_softirq_stack(unsigned long *stack, struct stack_info *info)
 {
-       unsigned long *begin = (unsigned long *)this_cpu_read(softirq_stack);
+       unsigned long *begin = (unsigned long *)this_cpu_read(softirq_stack_ptr);
        unsigned long *end   = begin + (THREAD_SIZE / sizeof(long));
 
        /*

diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index 95600a9..f37489c 100644 (file)
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -51,8 +51,8 @@ static inline int check_stack_overflow(void) { return 0; }
 static inline void print_stack_overflow(void) { }
 #endif
 
-DEFINE_PER_CPU(struct irq_stack *, hardirq_stack);
-DEFINE_PER_CPU(struct irq_stack *, softirq_stack);
+DEFINE_PER_CPU(struct irq_stack *, hardirq_stack_ptr);
+DEFINE_PER_CPU(struct irq_stack *, softirq_stack_ptr);
 
 static void call_on_stack(void *func, void *stack)
 {
@@ -76,7 +76,7 @@ static inline int execute_on_irq_stack(int overflow, struct irq_desc *desc)
        u32 *isp, *prev_esp, arg1;
 
        curstk = (struct irq_stack *) current_stack();
-       irqstk = __this_cpu_read(hardirq_stack);
+       irqstk = __this_cpu_read(hardirq_stack_ptr);
 
        /*
         * this is where we switch to the IRQ stack. However, if we are
@@ -113,21 +113,22 @@ void irq_ctx_init(int cpu)
 {
        struct irq_stack *irqstk;
 
-       if (per_cpu(hardirq_stack, cpu))
+       if (per_cpu(hardirq_stack_ptr, cpu))
                return;
 
        irqstk = page_address(alloc_pages_node(cpu_to_node(cpu),
                                               THREADINFO_GFP,
                                               THREAD_SIZE_ORDER));
-       per_cpu(hardirq_stack, cpu) = irqstk;
+       per_cpu(hardirq_stack_ptr, cpu) = irqstk;
 
        irqstk = page_address(alloc_pages_node(cpu_to_node(cpu),
                                               THREADINFO_GFP,
                                               THREAD_SIZE_ORDER));
-       per_cpu(softirq_stack, cpu) = irqstk;
+       per_cpu(softirq_stack_ptr, cpu) = irqstk;
 
-       printk(KERN_DEBUG "CPU %u irqstacks, hard=%p soft=%p\n",
-              cpu, per_cpu(hardirq_stack, cpu),  per_cpu(softirq_stack, cpu));
+       pr_debug("CPU %u irqstacks, hard=%p soft=%p\n",
+                cpu, per_cpu(hardirq_stack_ptr, cpu),
+                per_cpu(softirq_stack_ptr, cpu));
 }
 
 void do_softirq_own_stack(void)
@@ -135,7 +136,7 @@ void do_softirq_own_stack(void)
        struct irq_stack *irqstk;
        u32 *isp, *prev_esp;
 
-       irqstk = __this_cpu_read(softirq_stack);
+       irqstk = __this_cpu_read(softirq_stack_ptr);
 
        /* build the stack frame on the softirq stack */
        isp = (u32 *) ((char *)irqstk + sizeof(*irqstk));