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authorRusty Russell <rusty@rustcorp.com.au>2013-04-22 14:10:38 +0930
committerRusty Russell <rusty@rustcorp.com.au>2013-04-22 15:31:36 +0930
commit93a2cdff98243df06bafd3c4f3b31b38f0d0fe3e (patch)
treecfda9a918a92ac0308e1c888489c83c0b243138a /drivers/lguest/core.c
parent856c608827928d29f80605e85fc3f8f0ab3af4fb (diff)
downloadlinux-93a2cdff98243df06bafd3c4f3b31b38f0d0fe3e.tar.bz2
lguest: assume Switcher text is a single page.
ie. SHARED_SWITCHER_PAGES == 1. It is well under a page, and it's a minor simplification: it's nice to have *one* simplification in a patch series! Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/core.c')
-rw-r--r--drivers/lguest/core.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c
index 211d8267992b..4209065b9b1e 100644
--- a/drivers/lguest/core.c
+++ b/drivers/lguest/core.c
@@ -52,6 +52,13 @@ static __init int map_switcher(void)
* easy.
*/
+ /* We assume Switcher text fits into a single page. */
+ if (end_switcher_text - start_switcher_text > PAGE_SIZE) {
+ printk(KERN_ERR "lguest: switcher text too large (%zu)\n",
+ end_switcher_text - start_switcher_text);
+ return -EINVAL;
+ }
+
/*
* We allocate an array of struct page pointers. map_vm_area() wants
* this, rather than just an array of pages.
@@ -326,7 +333,7 @@ static int __init init(void)
goto out;
/* Now we set up the pagetable implementation for the Guests. */
- err = init_pagetables(switcher_pages, SHARED_SWITCHER_PAGES);
+ err = init_pagetables(switcher_pages);
if (err)
goto unmap;