linux-kernel - Re: [PATCH] ARM64: implement TASK_SIZE

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Message-ID: <20140620082520.GC25104@arm.com>
Date:	Fri, 20 Jun 2014 09:25:20 +0100
From:	Will Deacon <will.deacon@....com>
To:	Colin Cross <ccross@...roid.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] ARM64: implement TASK_SIZE_OF

Hi Colin,

On Wed, Jun 18, 2014 at 09:10:09PM +0100, Colin Cross wrote:
> include/linux/sched.h implements TASK_SIZE_OF as TASK_SIZE if it
> is not set by the architecture headers.  TASK_SIZE uses the
> current task to determine the size of the virtual address space.
> On a 64-bit kernel this will cause reading /proc/pid/pagemap of a
> 64-bit process from a 32-bit process to return EOF when it reads
> past 0xffffffff.
> 
> Implement TASK_SIZE_OF exactly the same as TASK_SIZE with
> test_tsk_thread_flag instead of test_thread_flag.

Looks sane to me.

  Acked-by: Will Deacon <will.deacon@....com>

I take it you're being bitten by this in real software, hence the CC stable
tag?

Will
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