linux-kernel - [Question] mm/vmpressure.c: ilog2 calculation in constant

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Message-ID: <1825464932.40588.1622203733380@office.mailbox.org>
Date:   Fri, 28 May 2021 14:08:53 +0200 (CEST)
From:   torvic9@...lbox.org
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Cc:     "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: [Question] mm/vmpressure.c: ilog2 calculation in constant

Hello,

in mm/vmpressure.c, we have defined this constant:

  static const unsigned int vmpressure_level_critical_prio = ilog2(100 / 10);

My question is: Why do we calculate ilog2 instead of simply setting the constant to '3'?
Then, I guess, we could also get rid of the log2.h include.
Note that this is just a question, not a request, as I'm sure there is a reason for this.
(given the help text in the comment just above)

Greetings,
Tor Vic