eventfd - allow atomic read and waitqueue remove

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KVM needs a wait to atomically remove themselves from the eventfd ->poll()
wait queue head, in order to handle correctly their IRQfd deassign
operation.

This patch introduces such API, plus a way to read an eventfd from its
context.

Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: Avi Kivity <avi@redhat.com>

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Davide Libenzi 2010-01-13 09:34:36 -08:00 • committed by Marcelo Tosatti

parent a6085fbaf6

commit cb289d6244

2 changed files with 90 additions and 15 deletions

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89

fs/eventfd.c

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16

include/linux/eventfd.h

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