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Date:   Sat, 11 May 2019 15:55:00 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Timmy Li <scuttimmy@gmail.com>
Cc:     ebiederm@xmission.com, mhocko@suse.com, willy@infradead.org,
        oleg@redhat.com, rppt@linux.vnet.ibm.com,
        ktsanaktsidis@zendesk.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] pid: Remove unneeded hash header file
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On Mon, 29 Apr 2019 22:33:19 -0700 Timmy Li <scuttimmy@gmail.com> wrote:

> Hash functions are not needed since idr is used now.
> Let's remove hash header file for cleanup.
> 

OK.

And the nice block comment at the start of kernel/pid.c is rather out
of date...