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[Xen-devel] [PATCH v2] 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@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>

v2: Add __ref annotation

 arch/x86/xen/p2m.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

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 @@ static void * __ref alloc_p2m_page(void)
        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);

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