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    Subject[PATCH 4.9 215/223] arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ
    Date
    From: Will Deacon <will.deacon@arm.com>

    commit 24951465cbd279f60b1fdc2421b3694405bcff42 upstream.

    arch/arm/ defines a SIGMINSTKSZ of 2k, so we should use the same value
    for compat tasks.

    Cc: Arnd Bergmann <arnd@arndb.de>
    Cc: Dominik Brodowski <linux@dominikbrodowski.net>
    Cc: "Eric W. Biederman" <ebiederm@xmission.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Al Viro <viro@zeniv.linux.org.uk>
    Cc: Oleg Nesterov <oleg@redhat.com>
    Reviewed-by: Dave Martin <Dave.Martin@arm.com>
    Reported-by: Steve McIntyre <steve.mcintyre@arm.com>
    Tested-by: Steve McIntyre <93sam@debian.org>
    Signed-off-by: Will Deacon <will.deacon@arm.com>
    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/arm64/include/asm/compat.h | 1 +
    1 file changed, 1 insertion(+)

    --- a/arch/arm64/include/asm/compat.h
    +++ b/arch/arm64/include/asm/compat.h
    @@ -234,6 +234,7 @@ static inline compat_uptr_t ptr_to_compa
    }

    #define compat_user_stack_pointer() (user_stack_pointer(task_pt_regs(current)))
    +#define COMPAT_MINSIGSTKSZ 2048

    static inline void __user *arch_compat_alloc_user_space(long len)
    {

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