x86/xen: Free bootmem in free_p2m_page() during early boot
With recent changes in p2m we now have legitimate cases when
p2m memory needs to be freed during early boot (i.e. before
slab is initialized).
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index edbc7a6..cab221d 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -167,10 +167,13 @@
return (void *)__get_free_page(GFP_KERNEL | __GFP_REPEAT);
}
-/* Only to be called in case of a race for a page just allocated! */
-static void free_p2m_page(void *p)
+static void __ref free_p2m_page(void *p)
{
- BUG_ON(!slab_is_available());
+ if (unlikely(!slab_is_available())) {
+ free_bootmem((unsigned long)p, PAGE_SIZE);
+ return;
+ }
+
free_page((unsigned long)p);
}