ipc: separate msg allocation from userspace copy
Separating msg allocation enables single-block vmalloc allocation instead. Signed-off-by: NPeter Hurley <peter@hurleysoftware.com> Acked-by: NStanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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