linux-kernel - Re: [RFC PATCH] lib: Introduce generic __cmpxchg

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Message-ID: <b0160f4b-b996-b0ee-405a-3d5f1866272e@gmail.com>
Date:   Thu, 1 Nov 2018 09:59:38 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Trond Myklebust <trondmy@...merspace.com>
Cc:     "mark.rutland@....com" <mark.rutland@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ralf@...ux-mips.org" <ralf@...ux-mips.org>,
        "jlayton@...nel.org" <jlayton@...nel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "bfields@...ldses.org" <bfields@...ldses.org>,
        "linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "will.deacon@....com" <will.deacon@....com>,
        "boqun.feng@...il.com" <boqun.feng@...il.com>,
        "paul.burton@...s.com" <paul.burton@...s.com>,
        "anna.schumaker@...app.com" <anna.schumaker@...app.com>,
        "jhogan@...nel.org" <jhogan@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "arnd@...db.de" <arnd@...db.de>,
        "paulus@...ba.org" <paulus@...ba.org>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        aryabinin@...tuozzo.com, dvyukov@...gle.com
Subject: Re: [RFC PATCH] lib: Introduce generic __cmpxchg_u64() and use it
 where needed



On 11/01/2018 09:32 AM, Peter Zijlstra wrote:

>> Anyhow, if the atomic maintainers are willing to stand up and state for
>> the record that the atomic counters are guaranteed to wrap modulo 2^n
>> just like unsigned integers, then I'm happy to take Paul's patch.
> 
> I myself am certainly relying on it.


Could we get uatomic_t support maybe ?

This reminds me of this sooooo silly patch :/

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=adb03115f4590baa280ddc440a8eff08a6be0cb7