[patch V3 25/32] x86/irq/32: Rename hard/softirq_stack to hard/softirq_stack_ptr

Thomas Gleixner
2019-04-14T16:03:56Z

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

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/include/asm/processor.h | 4 ++--
arch/x86/kernel/dumpstack_32.c | 4 ++--
arch/x86/kernel/irq_32.c | 19 ++++++++++---------
3 files changed, 14 insertions(+), 13 deletions(-)

--- 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;
--- 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_t

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 lo

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));

/*
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -51,8 +51,8 @@ static inline int check_stack_overflow(v
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(i
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));