linux-kernel - [tip:x86/irq] x86/irq/32: Define IRQ_STACK

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Date:   Wed, 17 Apr 2019 07:17:19 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...hat.com, akpm@...ux-foundation.org, bp@...e.de,
        tglx@...utronix.de, mingo@...nel.org, mhocko@...e.com,
        jpoimboe@...hat.com, vbabka@...e.cz, luto@...nel.org,
        sean.j.christopherson@...el.com, dave.hansen@...el.com,
        x86@...nel.org, hpa@...or.com, jkosina@...e.cz,
        linux-kernel@...r.kernel.org, suravee.suthikulpanit@....com,
        ndesaulniers@...gle.com, jgross@...e.com
Subject: [tip:x86/irq] x86/irq/32: Define IRQ_STACK_SIZE

Commit-ID:  aa641c287b2f7676f6f0064a8351daf08eca6b0a
Gitweb:     https://git.kernel.org/tip/aa641c287b2f7676f6f0064a8351daf08eca6b0a
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Sun, 14 Apr 2019 17:59:59 +0200
Committer:  Borislav Petkov <bp@...e.de>
CommitDate: Wed, 17 Apr 2019 15:18:36 +0200

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 it for struct irq_stack.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Jiri Kosina <jkosina@...e.cz>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Juergen Gross <jgross@...e.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Sean Christopherson <sean.j.christopherson@...el.com>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: x86-ml <x86@...nel.org>
Link: https://lkml.kernel.org/r/20190414160145.632513987@linutronix.de
---
 arch/x86/include/asm/page_32_types.h | 2 ++
 arch/x86/include/asm/processor.h     | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/page_32_types.h b/arch/x86/include/asm/page_32_types.h
index 57b5dc15ca7e..565ad755c785 100644
--- 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
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 8fcfcd1a8375..8b4bf732e1b5 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -422,8 +422,8 @@ DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
  * 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);