xen: fix allocation and use of large ldts, cleanup
Add a proper comment for set_aliased_prot() and fix an
unsigned long/void * warning.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index cf8b3a9..04ec69e 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -237,8 +237,10 @@
}
/*
- * If 'v' is a vmalloc mapping, then find the linear mapping of the
- * page (if any) and also set its protections to match:
+ * Set the page permissions for a particular virtual address. If the
+ * address is a vmalloc mapping (or other non-linear mapping), then
+ * find the linear mapping of the page and also set its protections to
+ * match.
*/
static void set_aliased_prot(void *v, pgprot_t prot)
{
@@ -387,8 +389,7 @@
static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
const void *ptr)
{
- unsigned long lp = (unsigned long)&dt[entrynum];
- xmaddr_t mach_lp = arbitrary_virt_to_machine(lp);
+ xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]);
u64 entry = *(u64 *)ptr;
preempt_disable();