From mboxrd@z Thu Jan  1 00:00:00 1970
From: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Subject: Re: [PATCH v3 0/2] qspinlock: Introducing a 4-byte queue spinlock
Date: Mon, 03 Feb 2014 14:21:23 +0530
Message-ID: <52EF588B.4050904@linux.vnet.ibm.com>
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To: Waiman Long <waiman.long@hp.com>
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, x86@kernel.org, linux-kernel@vger.kernel.org, Peter Zijlstra <peterz@infradead.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>, Linus Torvalds <torvalds@linux-foundation.org>, George Spelvin <linux@horizon.com>, Tim Chen <tim.c.chen@linux.intel.com>, Daniel J Blueman <daniel@numascale.com>, Alexander Fyodorov <halcy@yandex.ru>, Aswin Chandramouleeswaran <aswin@hp.com>, Scott J Norton <scott.norton@hp.com>, Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@hp.com>
List-Id: linux-arch.vger.kernel.org

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 =E2=80=98__ilog2_u32=E2=80=99:
>>> include/linux/log2.h:34:2: error: implicit declaration of function
>>> =E2=80=98fls=E2=80=99 [-Werror=3Dimplicit-function-declaration]
>>> include/linux/log2.h: In function =E2=80=98__ilog2_u64=E2=80=99:
>>> include/linux/log2.h:42:2: error: implicit declaration of function
>>> =E2=80=98fls64=E2=80=99 [-Werror=3Dimplicit-function-declaration]
>>> include/linux/log2.h: In function =E2=80=98__roundup_pow_of_two=E2=80=
=99:
>>> .
>>> .
>>> [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 th=
at I
>> can reproduce the compilation error in my build environment.
>>
>
> I did compile on latest linux tree which had barrier.txt. May be I 'l=
l
> 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.