linux-kernel - Re: [PATCH 12/19] x86: make is_64bit

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Date:	Mon, 18 May 2015 23:06:14 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dave Hansen <dave@...1.net>
cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	dave.hansen@...ux.intel.com, oleg@...hat.com
Subject: Re: [PATCH 12/19] x86: make is_64bit_mm() widely available

On Fri, 8 May 2015, Dave Hansen wrote:
> The uprobes code has a nice helper, is_64bit_mm(), that consults both
> the runtime and compile-time flags for 32-bit support.  Instead of
> reinventing the wheel, pull it in to an x86 header so we can use it
> for MPX.
> 
> I prefer passing the mm around to test_thread_flag(TIF_IA32) because
> it makes it explicit where the context is coming from. 

Ack.

> It will also make it easier if we ever need to access the MPX
> structures from another process.

Do we really want to go there?

Otherwise: Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
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