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

[David Rientjes]

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@xxxxxxxxxxxxxx>
> 
> Signed-off-by: Dave Hansen <haveblue@xxxxxxxxxx>
> Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
> Signed-off-by: Matt Mackall <mpm@xxxxxxxxxxx>

Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
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