linux-kernel - Re: [PATCH] mm/vmalloc: Replace the ternary conditional operator with min()

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Message-ID: <2489af27-0e6e-4005-b2c0-dd4e55d15154@lucifer.local>
Date:   Sat, 10 Jun 2023 23:23:13 +0100
From:   Lorenzo Stoakes <lstoakes@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     David Laight <David.Laight@...lab.com>,
        Lu Hongfei <luhongfei@...o.com>,
        Uladzislau Rezki <urezki@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        "open list:VMALLOC" <linux-mm@...ck.org>,
        open list <linux-kernel@...r.kernel.org>,
        "opensource.kernel@...o.com" <opensource.kernel@...o.com>
Subject: Re: [PATCH] mm/vmalloc: Replace the ternary conditional operator
 with min()

On Sat, Jun 10, 2023 at 03:08:09PM -0700, Andrew Morton wrote:
> On Sat, 10 Jun 2023 22:06:35 +0100 Lorenzo Stoakes <lstoakes@...il.com> wrote:
>
> > > > OK, as per the pedantic test bot, you'll need to change this to:-
> > > >
> > > > num = min_t(size_t, remains, PAGE_SIZE);
>
> PAGE_SIZE is a nuisance.  It _usually_ creates the need for a
> cast:
>
> hp2:/usr/src/linux-6.4-rc4> grep -r "min(.*PAGE_SIZE" . | wc -l
> 117
> hp2:/usr/src/linux-6.4-rc4> grep -r "min_t(.*PAGE_SIZE" . | wc -l
> 279
>
> Perhaps it should always have been size_t.
>

I mean I absolutely agree this not being size_t is a bit silly although I'm
pretty convinced sizeof(size_t) == sizeof(unsigned long) in all kernel
arches (correct me if I'm wrong).

So I'd not be against this at all :)

> I suppose we could do
>
> #define PAGE_SIZE_T (size_t)PAGE_SIZE
>
> And use that where needed.  Mainly because I like the name ;)

I'm not sure I love that name :P but it is kind of cute I guess!