linux-kernel - Re: wakeup_pipe_readers/writers() && pipe

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Message-ID: <20250106180325.GF7233@redhat.com>
Date: Mon, 6 Jan 2025 19:03:25 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Manfred Spraul <manfred@...orfullife.com>,
	Christian Brauner <brauner@...nel.org>,
	David Howells <dhowells@...hat.com>,
	WangYuli <wangyuli@...ontech.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: wakeup_pipe_readers/writers() && pipe_poll()

On 01/06, Oleg Nesterov wrote:
>
> To be honest, I don't understand the wait_address check in poll_wait(),
> it seems that wait_address is never NULL.

Yes,

	$ git grep -E '\bpoll_wait\('  | perl -wne '/\(.*?,\s*\&/ or print'

doesn't find anything "interesting". I think the wait_address check
should die, it only adds the unnecessary confusion.

Oleg.