lguest: change spte_addr header

spte_addr does not depend on any guest information, so we
wipe out the lg parameter completely.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

drivers/lguest/page_tables.c

@@ -84,7 +84,7 @@ static pgd_t *spgd_addr(struct lguest *lg, u32 i, unsigned long vaddr)
 /* This routine then takes the page directory entry returned above, which
  * contains the address of the page table entry (PTE) page.  It then returns a
  * pointer to the PTE entry for the given address. */
-static pte_t *spte_addr(struct lguest *lg, pgd_t spgd, unsigned long vaddr)
+static pte_t *spte_addr(pgd_t spgd, unsigned long vaddr)
 {
 	pte_t *page = __va(pgd_pfn(spgd) << PAGE_SHIFT);
 	/* You should never call this if the PGD entry wasn't valid */
@@ -261,7 +261,7 @@ int demand_page(struct lg_cpu *cpu, unsigned long vaddr, int errcode)
 		gpte = pte_mkdirty(gpte);
 
 	/* Get the pointer to the shadow PTE entry we're going to set. */
-	spte = spte_addr(lg, *spgd, vaddr);
+	spte = spte_addr(*spgd, vaddr);
 	/* If there was a valid shadow PTE entry here before, we release it.
 	 * This can happen with a write to a previously read-only entry. */
 	release_pte(*spte);
@@ -310,7 +310,7 @@ static int page_writable(struct lg_cpu *cpu, unsigned long vaddr)
 
 	/* Check the flags on the pte entry itself: it must be present and
 	 * writable. */
-	flags = pte_flags(*(spte_addr(cpu->lg, *spgd, vaddr)));
+	flags = pte_flags(*(spte_addr(*spgd, vaddr)));
 
 	return (flags & (_PAGE_PRESENT|_PAGE_RW)) == (_PAGE_PRESENT|_PAGE_RW);
 }
@@ -509,7 +509,7 @@ static void do_set_pte(struct lguest *lg, int idx,
 	/* If the top level isn't present, there's no entry to update. */
 	if (pgd_flags(*spgd) & _PAGE_PRESENT) {
 		/* Otherwise, we start by releasing the existing entry. */
-		pte_t *spte = spte_addr(lg, *spgd, vaddr);
+		pte_t *spte = spte_addr(*spgd, vaddr);
 		release_pte(*spte);
 
 		/* If they're setting this entry as dirty or accessed, we might