linux-kernel - Re: [PATCH v2 5/6] debugfs: add debugfs_create_atomic64_t for atomic64

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Message-ID: <CAHk-=wiGhHk4u2RRZmJinA4Apb47pXXJPW9cOZ_2-yUqOvaC7Q@mail.gmail.com>
Date:   Wed, 5 Apr 2023 09:23:09 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     david@...hat.com, patches@...ts.linux.dev,
        linux-modules@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, pmladek@...e.com,
        petr.pavlu@...e.com, prarit@...hat.com, gregkh@...uxfoundation.org,
        rafael@...nel.org, christophe.leroy@...roup.eu, tglx@...utronix.de,
        peterz@...radead.org, song@...nel.org, rppt@...nel.org,
        dave@...olabs.net, willy@...radead.org, vbabka@...e.cz,
        mhocko@...e.com, dave.hansen@...ux.intel.com,
        colin.i.king@...il.com, jim.cromie@...il.com,
        catalin.marinas@....com, jbaron@...mai.com,
        rick.p.edgecombe@...el.com
Subject: Re: [PATCH v2 5/6] debugfs: add debugfs_create_atomic64_t for atomic64_t

On Wed, Apr 5, 2023 at 9:11 AM Luis Chamberlain <mcgrof@...nel.org> wrote:
>
> Oh but I don't get the atomic incs, so we'd need debugfs_create_atomic_long_t().

No, you misunderstand what I meant.

Just use "atomic_long_t" in the module code.

But then the debugfs code should do

        debugfs_create_ulong(... &val->counter ..);

to expose said atomic_long values.

No need for new debugfs interfaces.

Because "atomic_long" is just a regular "long" as far as plain
read/set operations are concerned - which is all that the debugfs code
does anyway.

So I think you can do something like

  atomic_long_t total_mod_size;

   ...

  debugfs_create_ulong("total_mod_size",
       0400, mod_debugfs_root,
       &total_mod_size.counter);

but I didn't actually try to compile that kind of version.

(I think "counter" is actually a _signed_ long, so maybe the types don't match).

               Linus