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

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Message-ID: <cd49c00e-1982-b7f3-5637-4a35533ac498@redhat.com>
Date:   Thu, 6 Apr 2023 16:14:49 +0200
From:   David Hildenbrand <david@...hat.com>
To:     David Laight <David.Laight@...LAB.COM>,
        'Christophe Leroy' <christophe.leroy@...roup.eu>,
        'Luis Chamberlain' <mcgrof@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "patches@...ts.linux.dev" <patches@...ts.linux.dev>,
        "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pmladek@...e.com" <pmladek@...e.com>,
        "petr.pavlu@...e.com" <petr.pavlu@...e.com>,
        "prarit@...hat.com" <prarit@...hat.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
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        "song@...nel.org" <song@...nel.org>,
        "rppt@...nel.org" <rppt@...nel.org>,
        "dave@...olabs.net" <dave@...olabs.net>,
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        "vbabka@...e.cz" <vbabka@...e.cz>,
        "mhocko@...e.com" <mhocko@...e.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
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        "jbaron@...mai.com" <jbaron@...mai.com>,
        "rick.p.edgecombe@...el.com" <rick.p.edgecombe@...el.com>
Subject: Re: [PATCH v2 5/6] debugfs: add debugfs_create_atomic64_t for
 atomic64_t

On 06.04.23 15:48, David Laight wrote:
> From: Christophe Leroy
>> Sent: 06 April 2023 14:38
> ...
>> On powerpc 'long long' is 64 bits on both PPC32 and PPC64.
> 
> It probably in on x85-64 as well.
> By brain is getting frazzled.
> 
> On 64bit long long ought to be 128bit.

I might have been living under a rock, but the only requirement I am 
aware of is for long long to be at least 64bit wide.

AFAIK, that is also the case on s390x and aarch64.

-- 
Thanks,

David / dhildenb