x86-64: fall back to regular page vmemmap on allocation failure

Memory hotplug can happen on a machine under load, memory shortness
and fragmentation, so huge page allocations for the vmemmap are not
guaranteed to succeed.

Try to fall back to regular pages before failing the hotplug event
completely.

Signed-off-by: Johannes Weiner <[email protected]>
Cc: Ben Hutchings <[email protected]>
Cc: Bernhard Schmidt <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Russell King <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: "Luck, Tony" <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: David Miller <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions