linux-kernel - Re: [PATCH v4 8/8] mm: Mark anonymous struct field of 'struct vm

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Message-ID: <CAHk-=wiOecmzTXoc6hbTmYdBCyhkmOpAHeMVXmJ_DEGgjPfZ5Q@mail.gmail.com>
Date:   Wed, 20 Jan 2021 11:02:06 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Will Deacon <will@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Jan Kara <jack@...e.cz>, Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Hugh Dickins <hughd@...gle.com>,
        kernel-team <kernel-team@...roid.com>
Subject: Re: [PATCH v4 8/8] mm: Mark anonymous struct field of 'struct
 vm_fault' as 'const'

On Wed, Jan 20, 2021 at 10:27 AM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> Is there a difference between: [ const unnamed struct and individual const members ]

Semantically? No.

Syntactically the "group the const members together" is a lot cleaner,
imho. Not just from a "just a single const" standpoint, but from a
"code as documentation" standpoint.

But I guess to avoid the clang issue, we could do the "mark individual
fields" thing.

(It turns out that sparse gets this wrong too, so it's not just clang).

           Linus