[PATCH] uml: correct removal of pte_mkexec

Correct commit 5906e4171a - this makes more
sense: we turn pte_mkexec + pte_wrprotect to pte_mkread.  However, due to a
bug in pte_mkread, it does the exact same thing as pte_mkwrite, so this patch
improves the code but does not change anything in practice.  The pte_mkread
bug is fixed separately, as it may have big impact.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/kernel/skas/mmu.c

@@ -60,10 +60,7 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc,
 #endif
 
 	*pte = mk_pte(virt_to_page(kernel), __pgprot(_PAGE_PRESENT));
-	/* This is wrong for the code page, but it doesn't matter since the
-	 * stub is mapped by hand with the correct permissions.
-	 */
-	*pte = pte_mkwrite(*pte);
+	*pte = pte_mkread(*pte);
 	return(0);
 
  out_pmd: