linux-kernel - Re: linux-next: build failure after merge of the aio tree

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Message-ID: <20160204143204.GC16315@kvack.org>
Date:	Thu, 4 Feb 2016 09:32:04 -0500
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Linux-Next <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: linux-next: build failure after merge of the aio tree

On Thu, Feb 04, 2016 at 02:12:53PM +0000, Russell King - ARM Linux wrote:
> Hence, __get_user() on x86-32 with a 64-bit quantity results in
> __get_user_bad() being called, which is an undefined function.
> Only if you build with x86-64 support enabled (iow, CONFIG_X86_32 not
> defined) then you get the 64-bit __get_user() support.
> 
> Given this, I fail to see how x86-32 can possibly work.

You're right; mea culpa.  It compiles without warning on x86-32, but it 
does not link.  I still think this is broken archtecture stupidity since 
put_user() works for 64 bit data types.

		-ben
-- 
"Thought is the essence of where you are now."