Re: [PATCH] epoll: clear the tfile_check_list on -ELOOP

From: Andrew Morton
Date: Tue Apr 17 2012 - 17:13:13 EST

On Tue, 17 Apr 2012 10:34:52 -0400
Jason Baron <jbaron@xxxxxxxxxx> wrote:

> An epoll_ctl(,EPOLL_CTL_ADD,,) operation can return '-ELOOP' to prevent
> circular epoll dependencies from being created. However, in that case
> we do not properly clear the 'tfile_check_list'. Thus, add a call to
> clear_tfile_check_list() for the -ELOOP case.

So here I am wondering what effect this bug has upon our users, so I
can decide which kernel versions should be fixed. Jason didn't tell me
so I went to read the description of clear_tfile_check_list(). After a
brief chuckle, I stopped.

I then found Yurij's original report, so I know what's going on. But I
still can't write your changelog because I don't know whether this is a
regression and if it is, which patch caused the regression.

Wanna help out here please?

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