x86/irq/32: Make irq stack a character array

There is no reason to have an u32 array in struct irq_stack. The only
purpose of the array is to size the struct properly.

Preparatory change for sharing struct irq_stack with 64-bit.

Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Kosina <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: Pingfan Liu <[email protected]>
Cc: Pu Wen <[email protected]>
Cc: Sean Christopherson <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 8b4bf732e1b5..ff3f469ab2d4 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -422,7 +422,7 @@ DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
  * per-CPU IRQ handling stacks
  */
 struct irq_stack {
-	u32			stack[IRQ_STACK_SIZE / sizeof(u32)];
+	char			stack[IRQ_STACK_SIZE];
 } __aligned(IRQ_STACK_SIZE);
 
 DECLARE_PER_CPU(struct irq_stack *, hardirq_stack);