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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Thu, 29 Jul 2021 16:01:07 -0700
Message-ID: <CAHk-=wh-DWvsFykwAy6uwyv24nasJ39d7SHT+15x+xEXBtSm_Q@mail.gmail.com>
Subject: Re: [PATCH 1/1] fs: pipe: wakeup readers everytime new data written
 is to pipe
To:     Sandeep Patil <sspatil@android.com>
Cc:     linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        David Howells <dhowells@redhat.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable <stable@vger.kernel.org>,
        Android Kernel Team <kernel-team@android.com>
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On Thu, Jul 29, 2021 at 3:27 PM Sandeep Patil <sspatil@android.com> wrote:
>
> So restore the old behavior to wakeup all readers if any new data is
> written to the pipe.

Ah-hahh.

I've had this slightly smaller patch waiting for the better part of a year:

  https://lore.kernel.org/lkml/CAHk-=wgjR7Nd4CyDoi3SH9kPJp_Td9S-hhFJZMqvp6GS1Ww8eg@mail.gmail.com/

waiting to see if some broken program actually depends on the bogus
epollet semantics.

Can you verify that that patch fixes the realm-core brokenness too?

             Linus