linux-kernel - [patch V3 23/32] x86/irq/32: Define IRQ_STACK

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Message-Id: <20190414160145.632513987@linutronix.de>
Date:   Sun, 14 Apr 2019 17:59:59 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Andy Lutomirski <luto@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [patch V3 23/32] x86/irq/32: Define IRQ_STACK_SIZE

On 32-bit IRQ_STACK_SIZE is the same as THREAD_SIZE.

To allow sharing struct irq_stack with 32-bit, define IRQ_STACK_SIZE for
32-bit and use of for struct irq_stack.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/page_32_types.h |    2 ++
 arch/x86/include/asm/processor.h     |    4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

--- a/arch/x86/include/asm/page_32_types.h
+++ b/arch/x86/include/asm/page_32_types.h
@@ -22,6 +22,8 @@
 #define THREAD_SIZE_ORDER	1
 #define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
 
+#define IRQ_STACK_SIZE		THREAD_SIZE
+
 #define N_EXCEPTION_STACKS	1
 
 #ifdef CONFIG_X86_PAE
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -422,8 +422,8 @@ DECLARE_PER_CPU_ALIGNED(struct stack_can
  * per-CPU IRQ handling stacks
  */
 struct irq_stack {
-	u32                     stack[THREAD_SIZE/sizeof(u32)];
-} __aligned(THREAD_SIZE);
+	u32			stack[IRQ_STACK_SIZE / sizeof(u32)];
+} __aligned(IRQ_STACK_SIZE);
 
 DECLARE_PER_CPU(struct irq_stack *, hardirq_stack);
 DECLARE_PER_CPU(struct irq_stack *, softirq_stack);