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    Subject[PATCH v2 resend 01/12] x86: add context tag to mark mm when running a task in 32-bit compatibility mode
    Date
    This tag is intended to mirror the thread info TIF_IA32 flag.  Will be used to
    identify mm's which support 32 bit tasks running in compatibility mode without
    requiring a reference to the task itself.

    Signed-off-by: Stephen Wilson <wilsons@start.ca>
    Reviewed-by: Michel Lespinasse <walken@google.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    ---
    arch/x86/include/asm/mmu.h | 6 ++++++
    1 files changed, 6 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/include/asm/mmu.h b/arch/x86/include/asm/mmu.h
    index 80a1dee..aeff3e8 100644
    --- a/arch/x86/include/asm/mmu.h
    +++ b/arch/x86/include/asm/mmu.h
    @@ -13,6 +13,12 @@ typedef struct {
    int size;
    struct mutex lock;
    void *vdso;
    +
    +#ifdef CONFIG_X86_64
    + /* True if mm supports a task running in 32 bit compatibility mode. */
    + unsigned short ia32_compat;
    +#endif
    +
    } mm_context_t;

    #ifdef CONFIG_SMP
    --
    1.7.3.5


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