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Date: Sun, 21 May 2017 16:19:27 +0200
From: Borislav Petkov <bp@suse.de>
To: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>,
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Subject: Re: [PATCH v7 01/26] ptrace,x86: Make user_64bit_mode() available to
 32-bit builds
Message-ID: <20170521141927.GB5676@nazgul.tnic>
References: <20170505181724.55000-1-ricardo.neri-calderon@linux.intel.com>
 <20170505181724.55000-2-ricardo.neri-calderon@linux.intel.com>
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On Fri, May 05, 2017 at 11:16:59AM -0700, Ricardo Neri wrote:
> 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>
> Cc: Dave Hansen <dave.hansen@linux.intel.com>
> Cc: Adam Buchbinder <adam.buchbinder@gmail.com>
> Cc: Colin Ian King <colin.king@canonical.com>
> Cc: Lorenzo Stoakes <lstoakes@gmail.com>
> Cc: Qiaowei Ren <qiaowei.ren@intel.com>
> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
> Cc: Masami Hiramatsu <mhiramat@kernel.org>
> Cc: Adrian Hunter <adrian.hunter@intel.com>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Thomas Garnier <thgarnie@google.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Borislav Petkov <bp@suse.de>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
> Cc: x86@kernel.org
> Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
> ---
>  arch/x86/include/asm/ptrace.h | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)

Reviewed-by: Borislav Petkov <bp@suse.de>

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--