linux-kernel - Re: maps3: introduce task_size_of for all arches (updated v4)

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Message-ID: <alpine.DEB.0.9999.0710161025050.11410@chino.kir.corp.google.com>
Date:	Tue, 16 Oct 2007 10:25:20 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Hansen <haveblue@...ibm.com>
cc:	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Fengguang Wu <wfg@...l.ustc.edu.cn>
Subject: Re: maps3: introduce task_size_of for all arches (updated v4)

On Tue, 16 Oct 2007, Dave Hansen wrote:

> For the /proc/<pid>/pagemap code[1], we need to able to query how
> much virtual address space a particular task has.  The trick is
> that we do it through /proc and can't use TASK_SIZE since it
> references "current" on some arches.  The process opening the
> /proc file might be a 32-bit process opening a 64-bit process's
> pagemap file.
> 
> x86_64 already has a TASK_SIZE_OF() macro:
> 
> #define TASK_SIZE_OF(child)     ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)
> 
> I'd like to have that for other architectures.  So, add it
> for all the architectures that actually use "current" in 
> their TASK_SIZE.  For the others, just add a quick #define
> in sched.h to use plain old TASK_SIZE.
> 
> 1. http://www.linuxworld.com/news/2007/042407-kernel.html
> 
> - MIPS portion from Ralf Baechle <ralf@...ux-mips.org>
> 
> Signed-off-by: Dave Hansen <haveblue@...ibm.com>
> Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
> Signed-off-by: Matt Mackall <mpm@...enic.com>

Acked-by: David Rientjes <rientjes@...gle.com>
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