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H A Dvmalloc.cdiff 32fcfd40715ed13f7a80cbde49d097ddae20c8e2 Sun Mar 10 19:14:08 CDT 2013 Al Viro <viro@zeniv.linux.org.uk> make vfree() safe to call from interrupt contexts

A bunch of RCU callbacks want to be able to do vfree() and end up with
rather kludgy schemes. Just let vfree() do the right thing - put the
victim on llist and schedule actual __vunmap() via schedule_work(), so
that it runs from non-interrupt context.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>