linux-kernel - Re: [PATCH] mm: remove unneeded _

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Date:   Tue, 8 Aug 2023 03:31:01 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: remove unneeded __meminit annotation

On Tue, Aug 08, 2023 at 09:58:31AM +0800, Miaohe Lin wrote:
> kswapd_stop() and kcompactd_stop() are only called when MEMORY_HOTREMOVE
> is enabled. So wrap them under CONFIG_MEMORY_HOTREMOVE and further remove
> __meminit annotation. No functional change intended.

I don't understand why this is an improvement.  If CONFIG_MEMORY_HOTREMOVE
is disabled, the linker drops this section (... right?)  If it's enabled,
then it gets shunted off into a cold section.  So it seems like this
patch strictly makes things worse.  But maybe I misunderstood.