lguest: rename switcher_page to switcher_pages.

There is a single page with the Switcher in it, but it's followed by 2
pages per Host CPU.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

drivers/lguest/core.c

@@ -22,7 +22,7 @@
 
 unsigned long switcher_addr;
 static struct vm_struct *switcher_vma;
-static struct page **switcher_page;
+static struct page **switcher_pages;
 
 /* This One Big lock protects all inter-guest data structures. */
 DEFINE_MUTEX(lguest_lock);
@@ -56,9 +56,9 @@ static __init int map_switcher(void)
 	 * We allocate an array of struct page pointers.  map_vm_area() wants
 	 * this, rather than just an array of pages.
 	 */
-	switcher_page = kmalloc(sizeof(switcher_page[0])*TOTAL_SWITCHER_PAGES,
+	switcher_pages = kmalloc(sizeof(switcher_pages[0])*TOTAL_SWITCHER_PAGES,
 				 GFP_KERNEL);
-	if (!switcher_page) {
+	if (!switcher_pages) {
 		err = -ENOMEM;
 		goto out;
 	}
@@ -68,8 +68,8 @@ static __init int map_switcher(void)
 	 * so we make sure they're zeroed.
 	 */
 	for (i = 0; i < TOTAL_SWITCHER_PAGES; i++) {
-		switcher_page[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
-		if (!switcher_page[i]) {
+		switcher_pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
+		if (!switcher_pages[i]) {
 			err = -ENOMEM;
 			goto free_some_pages;
 		}
@@ -110,7 +110,7 @@ static __init int map_switcher(void)
 	 * array of struct pages.  It increments that pointer, but we don't
 	 * care.
 	 */
-	pagep = switcher_page;
+	pagep = switcher_pages;
 	err = map_vm_area(switcher_vma, PAGE_KERNEL_EXEC, &pagep);
 	if (err) {
 		printk("lguest: map_vm_area failed: %i\n", err);
@@ -135,8 +135,8 @@ static __init int map_switcher(void)
 	i = TOTAL_SWITCHER_PAGES;
 free_some_pages:
 	for (--i; i >= 0; i--)
-		__free_pages(switcher_page[i], 0);
-	kfree(switcher_page);
+		__free_pages(switcher_pages[i], 0);
+	kfree(switcher_pages);
 out:
 	return err;
 }
@@ -151,8 +151,8 @@ static void unmap_switcher(void)
 	vunmap(switcher_vma->addr);
 	/* Now we just need to free the pages we copied the switcher into */
 	for (i = 0; i < TOTAL_SWITCHER_PAGES; i++)
-		__free_pages(switcher_page[i], 0);
-	kfree(switcher_page);
+		__free_pages(switcher_pages[i], 0);
+	kfree(switcher_pages);
 }
 
 /*H:032
@@ -326,7 +326,7 @@ static int __init init(void)
 		goto out;
 
 	/* Now we set up the pagetable implementation for the Guests. */
-	err = init_pagetables(switcher_page, SHARED_SWITCHER_PAGES);
+	err = init_pagetables(switcher_pages, SHARED_SWITCHER_PAGES);
 	if (err)
 		goto unmap;
 

drivers/lguest/lg.h

@@ -15,7 +15,7 @@
 #include <asm/lguest.h>
 
 void free_pagetables(void);
-int init_pagetables(struct page **switcher_page, unsigned int pages);
+int init_pagetables(struct page **switcher_pages, unsigned int pages);
 
 struct pgdir {
 	unsigned long gpgdir;

drivers/lguest/page_tables.c

@@ -1084,7 +1084,7 @@ static void free_switcher_pte_pages(void)
  * Currently the Switcher is less than a page long, so "pages" is always 1.
  */
 static __init void populate_switcher_pte_page(unsigned int cpu,
-					      struct page *switcher_page[],
+					      struct page *switcher_pages[],
 					      unsigned int pages)
 {
 	unsigned int i;
@@ -1092,7 +1092,7 @@ static __init void populate_switcher_pte_page(unsigned int cpu,
 
 	/* The first entries are easy: they map the Switcher code. */
 	for (i = 0; i < pages; i++) {
-		set_pte(&pte[i], mk_pte(switcher_page[i],
+		set_pte(&pte[i], mk_pte(switcher_pages[i],
 				__pgprot(_PAGE_PRESENT|_PAGE_ACCESSED)));
 	}
 
@@ -1100,14 +1100,14 @@ static __init void populate_switcher_pte_page(unsigned int cpu,
 	i = pages + cpu*2;
 
 	/* First page (Guest registers) is writable from the Guest */
-	set_pte(&pte[i], pfn_pte(page_to_pfn(switcher_page[i]),
+	set_pte(&pte[i], pfn_pte(page_to_pfn(switcher_pages[i]),
 			 __pgprot(_PAGE_PRESENT|_PAGE_ACCESSED|_PAGE_RW)));
 
 	/*
 	 * The second page contains the "struct lguest_ro_state", and is
 	 * read-only.
 	 */
-	set_pte(&pte[i+1], pfn_pte(page_to_pfn(switcher_page[i+1]),
+	set_pte(&pte[i+1], pfn_pte(page_to_pfn(switcher_pages[i+1]),
 			   __pgprot(_PAGE_PRESENT|_PAGE_ACCESSED)));
 }
 
@@ -1128,7 +1128,7 @@ static __init void populate_switcher_pte_page(unsigned int cpu,
  * At boot or module load time, init_pagetables() allocates and populates
  * the Switcher PTE page for each CPU.
  */
-__init int init_pagetables(struct page **switcher_page, unsigned int pages)
+__init int init_pagetables(struct page **switcher_pages, unsigned int pages)
 {
 	unsigned int i;
 
@@ -1138,7 +1138,7 @@ __init int init_pagetables(struct page **switcher_page, unsigned int pages)
 			free_switcher_pte_pages();
 			return -ENOMEM;
 		}
-		populate_switcher_pte_page(i, switcher_page, pages);
+		populate_switcher_pte_page(i, switcher_pages, pages);
 	}
 	return 0;
 }