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Commit 5ef097dd authored by Michael Neuling's avatar Michael Neuling Committed by Linus Torvalds
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exec: create initial stack independent of PAGE_SIZE 



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: default avatarMichael Neuling <mikey@neuling.org>
Cc: Helge Deller <deller@gmx.de>
Reviewed-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Americo Wang <xiyou.wangcong@gmail.com>
Cc: Anton Blanchard <anton@samba.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9728e5d6

fs/exec.c

+1 −3
Original line number Diff line number Diff line
@@ -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