Introduce a new variable "arg_size" and set it appropriately in each
arm of the CONFIG_STACK_GROWSUP.  This patch fixes a bug for PA-RISC
and makes the code cleaner for everyone.

diff -urpNX dontdiff linus-2.6/fs/exec.c parisc-2.6/fs/exec.c
--- linus-2.6/fs/exec.c Tue Aug 12 13:11:16 2003
+++ parisc-2.6/fs/exec.c        Tue Aug 12 13:29:42 2003
@@ -341,6 +341,7 @@ int setup_arg_pages(struct linux_binprm
       struct vm_area_struct *mpnt;
       struct mm_struct *mm = current->mm;
       int i;
+       long arg_size;

#ifdef CONFIG_STACK_GROWSUP
       /* Move the argument and environment strings to the bottom of the
@@ -375,6 +376,7 @@ int setup_arg_pages(struct linux_binprm
       bprm->p = PAGE_SIZE * i - offset;
       stack_base = STACK_TOP - current->rlim[RLIMIT_STACK].rlim_max;
       mm->arg_start = stack_base;
+       arg_size = i << PAGE_SHIFT;

       /* zero pages that were copied above */
       while (i < MAX_ARG_PAGES)
@@ -382,6 +390,7 @@ int setup_arg_pages(struct linux_binprm
#else
       stack_base = STACK_TOP - MAX_ARG_PAGES * PAGE_SIZE;
       mm->arg_start = bprm->p + stack_base;
+       arg_size = STACK_TOP - (PAGE_MASK & (unsigned long) mm->arg_start);
#endif

       bprm->p += stack_base;
@@ -393,7 +402,7 @@ int setup_arg_pages(struct linux_binprm
       if (!mpnt)
               return -ENOMEM;

-       if (security_vm_enough_memory((STACK_TOP - (PAGE_MASK & (unsigned long) bprm->p))>>PAGE_SHIFT)) {
+       if (security_vm_enough_memory(arg_size >> PAGE_SHIFT)) {
               kmem_cache_free(vm_area_cachep, mpnt);
               return -ENOMEM;
       }