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    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@linutronix.de>
    AuthorDate: Sun, 14 Apr 2019 17:59:59 +0200
    Committer: Borislav Petkov <bp@suse.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@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@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: Michal Hocko <mhocko@suse.com>
    Cc: Nick Desaulniers <ndesaulniers@google.com>
    Cc: Sean Christopherson <sean.j.christopherson@intel.com>
    Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
    Cc: Vlastimil Babka <vbabka@suse.cz>
    Cc: x86-ml <x86@kernel.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);
    \
     
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