[CRIU] [PATCH 4/8] x86: Add 32bit variant of TASK_SIZE

[Cyrill Gorcunov]

On Fri, May 15, 2015 at 02:36:13PM +0300, Pavel Emelyanov wrote:
> > 
> > There are two limits for user space, depending on kernel
> > configuration: 0xc0000000 or 0xffffe000. 
> 
> O_o  Really??? Which config option controls this? I remember
> the so called 4g-split patches, which extended the userspace
> memory up to amost 4G, but AFAIK they never found their way
> into the mainstream kernel.

ARCH="i386" make nconfig

Processor type and features -->
  Memory split (3G/1G user/kernel split) -->

which modifies CONFIG_PAGE_OFFSET --> __PAGE_OFFSET -> PAGE_OFFSET -> TASK_SIZE

I guess even current 0xffffe000 might be not enough depending on
kernel config. It simply fit for my testing (ia32e mode) but
may be updated later.