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    Subject[tip:x86/mpx] ptrace,x86: Make user_64bit_mode() available to 32-bit builds
    Commit-ID:  e27c310af5c05cf876d9cad006928076c27f54d4
    Gitweb: https://git.kernel.org/tip/e27c310af5c05cf876d9cad006928076c27f54d4
    Author: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
    AuthorDate: Fri, 27 Oct 2017 13:25:30 -0700
    Committer: Thomas Gleixner <tglx@linutronix.de>
    CommitDate: Wed, 1 Nov 2017 21:50:08 +0100

    ptrace,x86: Make user_64bit_mode() available to 32-bit builds

    In its current form, user_64bit_mode() can only be used when CONFIG_X86_64
    is selected. This implies that code built with CONFIG_X86_64=n cannot use
    it. If a piece of code needs to be built for both CONFIG_X86_64=y and
    CONFIG_X86_64=n and wants to use this function, it needs to wrap it in
    an #ifdef/#endif; potentially, in multiple places.

    This can be easily avoided with a single #ifdef/#endif pair within
    user_64bit_mode() itself.

    Suggested-by: Borislav Petkov <bp@suse.de>
    Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Reviewed-by: Borislav Petkov <bp@suse.de>
    Cc: "Michael S. Tsirkin" <mst@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: ricardo.neri@intel.com
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
    Cc: Huang Rui <ray.huang@amd.com>
    Cc: Qiaowei Ren <qiaowei.ren@intel.com>
    Cc: Shuah Khan <shuah@kernel.org>
    Cc: Kees Cook <keescook@chromium.org>
    Cc: Jonathan Corbet <corbet@lwn.net>
    Cc: Jiri Slaby <jslaby@suse.cz>
    Cc: Dmitry Vyukov <dvyukov@google.com>
    Cc: "Ravi V. Shankar" <ravi.v.shankar@intel.com>
    Cc: Chris Metcalf <cmetcalf@mellanox.com>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Colin Ian King <colin.king@canonical.com>
    Cc: Chen Yucong <slaoub@gmail.com>
    Cc: Adam Buchbinder <adam.buchbinder@gmail.com>
    Cc: Vlastimil Babka <vbabka@suse.cz>
    Cc: Lorenzo Stoakes <lstoakes@gmail.com>
    Cc: Masami Hiramatsu <mhiramat@kernel.org>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Thomas Garnier <thgarnie@google.com>
    Link: https://lkml.kernel.org/r/1509135945-13762-4-git-send-email-ricardo.neri-calderon@linux.intel.com

    ---
    arch/x86/include/asm/ptrace.h | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h
    index 91c04c8..e2afbf6 100644
    --- a/arch/x86/include/asm/ptrace.h
    +++ b/arch/x86/include/asm/ptrace.h
    @@ -135,9 +135,9 @@ static inline int v8086_mode(struct pt_regs *regs)
    #endif
    }

    -#ifdef CONFIG_X86_64
    static inline bool user_64bit_mode(struct pt_regs *regs)
    {
    +#ifdef CONFIG_X86_64
    #ifndef CONFIG_PARAVIRT
    /*
    * On non-paravirt systems, this is the only long mode CPL 3
    @@ -148,8 +148,12 @@ static inline bool user_64bit_mode(struct pt_regs *regs)
    /* Headers are too twisted for this to go in paravirt.h. */
    return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;
    #endif
    +#else /* !CONFIG_X86_64 */
    + return false;
    +#endif
    }

    +#ifdef CONFIG_X86_64
    #define current_user_stack_pointer() current_pt_regs()->sp
    #define compat_user_stack_pointer() current_pt_regs()->sp
    #endif
    \
     
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