[RFC/PATCH] Generalize poll events from eventfd

From: Damian Hobson-Garcia
Date: Mon Aug 10 2015 - 01:53:35 EST

Hello all,

eventfd is very useful for generating POLLIN/POLLOUT poll events from user
space but some applications may want to generate POLLPRI/POLLERR events as well.
This patch submission aims to generalize the events generated by an
eventfd. This is a resubmission of a patch from Feb 2013[1]. The original
discussion trailed off without any conclusion, but the original author
has recently confirmed[2] that this functionality is still useful, so I
volunteered to rebase and resubmit the patch for discussion.

I have rebased this patch onto v4.2-rc5 and modified the original patch to
not add an indentation level to the implementations of eventfd_{read,write,
poll}. I hope these changes will make it easier to review. The description of
the efd_mask structure was also updated.

I have a few comments and questions, but I will add those separately as a
reply for open discussion.

[1] https://lkml.org/lkml/2013/2/18/147
[2] https://lkml.org/lkml/2015/7/9/153

Thank you,

Martin Sustrik (1):
eventfd: implementation of EFD_MASK flag

fs/eventfd.c | 91 ++++++++++++++++++++++++++++++++++++++------
include/linux/eventfd.h | 16 +-------
include/uapi/linux/eventfd.h | 40 +++++++++++++++++++
3 files changed, 121 insertions(+), 26 deletions(-)
create mode 100644 include/uapi/linux/eventfd.h


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