linux-kernel - Re: [PATCH v11 0/4] Introducing a queue read/write lock implementation

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Date:	Thu, 30 Jan 2014 10:50:41 -0500
From:	Waiman Long <waiman.long@...com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
	linux-arch@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michel Lespinasse <walken@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Rik van Riel <riel@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	George Spelvin <linux@...izon.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>, aswin@...com,
	Scott J Norton <scott.norton@...com>
Subject: Re: [PATCH v11 0/4] Introducing a queue read/write lock implementation

On 01/30/2014 10:43 AM, Waiman Long wrote:
> On 01/30/2014 10:17 AM, Peter Zijlstra wrote:
>> On Thu, Jan 30, 2014 at 02:04:53PM +0100, Peter Zijlstra wrote:
>>> So I took out that ugly union and rewrote the code to be mostly
>>> atomic_*(), gcc generates acceptable code and its smaller too.
>>>
>>>      824       0       0     824     338 
>>> defconfig-build/kernel/locking/qrwlock.o
>>>      776       0       0     776     308 
>>> defconfig-build/kernel/locking/qrwlock.o
>>>
>>> I don't think I wrecked it, but I've not actually tried it yet.
>> I did wreck it.. :-)
>>
>> The below is still small and actually works.
>>
>> ---
>>   arch/x86/Kconfig                      |    1
>>   arch/x86/include/asm/spinlock.h       |    2
>>   arch/x86/include/asm/spinlock_types.h |    4
>>   b/arch/x86/include/asm/qrwlock.h      |   18 +++
>>   b/include/asm-generic/qrwlock.h       |  174 
>> ++++++++++++++++++++++++++++++++++
>>   b/include/asm-generic/qrwlock_types.h |   17 +++
>>   b/kernel/locking/qrwlock.c            |  157 
>> ++++++++++++++++++++++++++++++
>>   kernel/Kconfig.locks                  |    7 +
>>   kernel/locking/Makefile               |    1
>>   9 files changed, 381 insertions(+)
>>
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>>
>
> OK, I see what you are trying to do. I can apply the change to my 
> patch & send out v12. So I presume that you are now OK with it. Can I 
> add your sign-off line?
>
> -Longman
>
>

One more thing, I often see line like

#define queue_write_unlock queue_write_unlock

So exactly what effect does this macro have?

-Longman

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