Re: TASK_SIZE is variable.

["David S. Miller" <davem@davemloft.net>]

On Wed, 26 Jan 2005 07:36:27 +0100
Andi Kleen <ak@suse.de> wrote:

> I still don't get it. When exactly can a process have memory > 32bit 
> and not have the 32bit flag set that is checked by TASK_SIZE. IMHO that's 
> the bug that needs addressing, because it will likely break more code.

I think on some platforms they move over to the 32-bit setting
in the thread struct before the address space is cleared out
for exec.

And if that is the case, I agree with Andi, that is the real bug
that needs to be fixed.

I recall that at one point Al Viro put some fix into binfmt_elf.c
that caused the thread compat type to change too early like that
and it made sparc64 explode so I knew to correct it immediately
and this happened years ago.

I just checked and ia64 sets thread.task_size in SET_PERSONALITY()
which is just fine, similarly for ppc64.  So I really wonder how
this problem can arise.