On Tue, 2007-05-22 at 16:49 -0700, Luck, Tony wrote:
> > In order to solve this, I added a STACK_TOP_MAX macro for each arch and
> > use that. This made IA64 boot properly.
>
> Yes. Patches apply to 2.6.21 cleanly, build cleanly and boot for me too.
> I can even run:
>
> $ ls -lrt `find /usr/share -type f -print`
>
> on the new kernel (thats 48020 files for a total of 2.3MB of args).
>
> > The second patch makes the compat stuff compile, untested though, as I
> > have no idea how that works on ia64.
>
> Not so good on this part. Running an ia32 binary on this patched kernel
> just hung my system :-(
I just tried this on an Altix from the test lab, and ia32 bash just
started.
native 64 bit gave this:
$ ls `find / -xdev -type f` | wc
1 89847 4200288
but the 32 bit bash kept complaining about his arg list being too long.
This might be a 32->64 issue (/bin/ls is 64 bit after all - and I
couldn't find a 32 bit ls in the compat packages), but I really don't
know. Will look into this.
The difference I had with what I posted last is below; these changes
were just me cleaning up. (and fixing one bug on STACK_GROWS_UP
introduced by the previous patches - but AFAIK that is not relevant to
ia64)
Signed-off-by: Peter Zijlstra <[email protected]>
---
fs/exec.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)
Index: linux-2.6-2/fs/exec.c
===================================================================
--- linux-2.6-2.orig/fs/exec.c 2007-05-24 09:15:54.000000000 +0200
+++ linux-2.6-2/fs/exec.c 2007-05-24 09:41:49.000000000 +0200
@@ -532,26 +532,23 @@ int setup_arg_pages(struct linux_binprm
stack_base = current->signal->rlim[RLIMIT_STACK].rlim_max;
if (stack_base > (1 << 30))
stack_base = 1 << 30;
- stack_base = PAGE_ALIGN(stack_top - stack_base);
/* Make sure we didn't let the argument array grow too large. */
if (vma->vm_end - vma->vm_start > stack_base)
return -ENOMEM;
+ stack_base = PAGE_ALIGN(stack_top - stack_base);
+
stack_shift = stack_base - vma->vm_start;
mm->arg_start = bprm->p + stack_shift;
bprm->p = vma->vm_end + stack_shift;
#else
BUG_ON(stack_top & ~PAGE_MASK);
- stack_base = arch_align_stack(stack_top - mm->stack_vm*PAGE_SIZE);
- stack_base = PAGE_ALIGN(stack_base);
-
- /* Make sure we didn't let the argument array grow too large. */
- if (stack_base > stack_top)
- return -ENOMEM;
+ stack_top = arch_align_stack(stack_top);
+ stack_top = PAGE_ALIGN(stack_top);
+ stack_shift = stack_top - vma->vm_end;
- stack_shift = stack_base - (bprm->p & PAGE_MASK);
bprm->p += stack_shift;
mm->arg_start = bprm->p;
#endif
@@ -598,7 +595,7 @@ int setup_arg_pages(struct linux_binprm
return -EFAULT;
}
#else
- if (expand_stack(vma, stack_base -
+ if (expand_stack(vma, vma->vm_start -
EXTRA_STACK_VM_PAGES * PAGE_SIZE)) {
up_write(&mm->mmap_sem);
return -EFAULT;
-
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