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Message-Id: <20211202151213.6ec830863342220da4141bc5@linux-foundation.org>
Date: Thu, 2 Dec 2021 15:12:13 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Xin Hao <xhao@...ux.alibaba.com>
Cc: sj@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND MERGE REQUEST] mm/damon: move damon_rand()
definition into damon.h
On Thu, 2 Dec 2021 15:58:59 +0800 Xin Hao <xhao@...ux.alibaba.com> wrote:
> damon_rand() is called in three files:damon/core.c, damon/
> paddr.c, damon/vaddr.c, i think there is no need to redefine
> this twice, So move it to damon.h will be a good choice.
Fair enough.
> +/* Get a random number in [l, r) */
> +#define damon_rand(l, r) (l + prandom_u32_max(r - l))
This shouldn't be implemented as a macro, for all the usual reasons
(typechecking, side-effects, ugliness, code-documentation site, etc).
In particular, this expression references `l' twice, so calling
damon_rand(a++, b);
will increment `a' twice, surprise surprise.
Can someone please send a followup patch to convert this (and any
similar damon macros) into (probably static inlined) C functions?
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