Message-ID: <52DF4C38.7040003@hp.com>
Date: Tue, 21 Jan 2014 23:42:32 -0500
From: Waiman Long <waiman.long@hp.com>
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To: Linus Torvalds <torvalds@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>
CC: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Arnd Bergmann <arnd@arndb.de>,
        "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
        the arch/x86 maintainers <x86@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Michel Lespinasse <walken@google.com>,
        Andi Kleen <andi@firstfloor.org>, Rik van Riel <riel@redhat.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
        George Spelvin <linux@horizon.com>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        "Chandramouleeswaran, Aswin" <aswin@hp.com>,
        Scott J Norton <scott.norton@hp.com>
Subject: Re: [PATCH v9 3/5] qrwlock, x86 - Treat all data type not bigger
 than long as atomic in x86
References: <1389761047-47566-1-git-send-email-Waiman.Long@hp.com> <1389761047-47566-4-git-send-email-Waiman.Long@hp.com> <20140120150316.GG30183@twins.programming.kicks-ass.net> <52DE9410.6090500@hp.com> <20140121153958.GA31570@twins.programming.kicks-ass.net> <52DE9BB0.5070909@hp.com> <CA+55aFzyww_kwU36jYk=LUtxzPUU76xgnQEOUTqGMFNe80sOZA@mail.gmail.com>
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On 01/21/2014 07:31 PM, Linus Torvalds wrote:
> On Tue, Jan 21, 2014 at 8:09 AM, Waiman Long<waiman.long@hp.com>  wrote:
>> include/linux/compiler.h:
>>
>> #ifndef __native_word
>> # ifdef __arch_native_word(t)
>> #  define __native_word(t)      __arch_native_word(t)
>> # else
>> #  define __native_word(t) (sizeof(t) == sizeof(int) || sizeof(t) == siizeof(long))
>> # endif
>> #endif
> Do we even really need this?
>
> I'd suggest removing it entirely. You might want to retain the whole
>
>    compiletime_assert_atomic_type()
>
> thing on purely the alpha side, but then it's all inside just the
> alpha code, without any need for this "native_word" thing.
>
> And if somebody tries to do a "smp_store_release()" on a random
> structure or union, do we care? We're not some nanny state that wants
> to give nice warnings for insane code.
>
>                Linus

That sounds good to me too. Peter, what do you think about this?

-Longman
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