linux-kernel - Re: [PATCH] mm: kmalloc_index: remove case when size is more than 32MB

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Message-ID: <YJccjBMBiwLqFrB8@casper.infradead.org>
Date:   Sun, 9 May 2021 00:19:40 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc:     cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, vbabka@...e.cz, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: kmalloc_index: remove case when size is more than
 32MB

On Sun, May 09, 2021 at 07:13:28AM +0900, Hyeonggon Yoo wrote:
> the return value of kmalloc_index is used as index of kmalloc_caches,

it doesn't matter.  every few weeks somebody posts a patch to "optimise"
kmalloc_index, failing to appreciate that it's only ever run at compile
time because it's all under __builtin_constant_p().