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exec: create initial stack independent of PAGE_SIZE

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Currently we create the initial stack based on the PAGE_SIZE.  This is
unnecessary.

This creates this initial stack independent of the PAGE_SIZE.

It also bumps up the number of 4k pages allocated from 20 to 32, to
align with 64K page systems.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Cc: Helge Deller <deller@gmx.de>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Americo Wang <xiyou.wangcong@gmail.com>
Cc: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Neuling 2010-03-05 13:42:57 -08:00 committed by Linus Torvalds
parent 9728e5d6e6
commit 5ef097dd7b
1 changed files with 1 additions and 3 deletions
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4
fs/exec.c
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@ -556,8 +556,6 @@ static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift)
return 0;
}
#define EXTRA_STACK_VM_PAGES 20 /* random */
/*
* Finalizes the stack vm_area_struct. The flags and permissions are updated,
* the stack is optionally relocated, and some extra space is added.
@ -632,7 +630,7 @@ int setup_arg_pages(struct linux_binprm *bprm,
goto out_unlock;
}
stack_expand = EXTRA_STACK_VM_PAGES * PAGE_SIZE;
stack_expand = 131072UL; /* randomly 32*4k (or 2*64k) pages */
stack_size = vma->vm_end - vma->vm_start;
/*
* Align this down to a page boundary as expand_stack