linux-kernel - Re: [PATCH v3 0/2] qspinlock: Introducing a 4-byte queue spinlock

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Message-ID: <52EF588B.4050904@linux.vnet.ibm.com>
Date:	Mon, 03 Feb 2014 14:21:23 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Waiman Long <waiman.long@...com>
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,
	Peter Zijlstra <peterz@...radead.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>,
	George Spelvin <linux@...izon.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Daniel J Blueman <daniel@...ascale.com>,
	Alexander Fyodorov <halcy@...dex.ru>,
	Aswin Chandramouleeswaran <aswin@...com>,
	Scott J Norton <scott.norton@...com>,
	Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@...com>
Subject: Re: [PATCH v3 0/2] qspinlock: Introducing a 4-byte queue spinlock

On 01/31/2014 12:19 AM, Raghavendra K T wrote:
> On 01/30/2014 09:08 PM, Waiman Long wrote:
>> On 01/30/2014 03:55 AM, Raghavendra K T wrote:
>>> On 01/28/2014 11:49 PM, Waiman Long wrote:
> [...]
>                    from kernel/bounds.c:9:
>>> include/linux/log2.h: In function ‘__ilog2_u32’:
>>> include/linux/log2.h:34:2: error: implicit declaration of function
>>> ‘fls’ [-Werror=implicit-function-declaration]
>>> include/linux/log2.h: In function ‘__ilog2_u64’:
>>> include/linux/log2.h:42:2: error: implicit declaration of function
>>> ‘fls64’ [-Werror=implicit-function-declaration]
>>> include/linux/log2.h: In function ‘__roundup_pow_of_two’:
>>> .
>>> .
>>> [trimmed]
>>>
>>
>> The code will need to be compiled in either the latest linux tree as the
>> patches have dependency on some new memory barrier that are in 3.14.
>> Alternatively, you can compile with the latest tip tree.
>>
>> If you have already done that, please send me your config file so that I
>> can reproduce the compilation error in my build environment.
>>
>
> I did compile on latest linux tree which had barrier.txt. May be I 'll
> recheck if I am missing something obvious.
>
> Here is .config attached

An Update:
The reason for failure was that I was compiling for guest. and
CONFIG_PARAVIRT was enabled.



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