Subject: [PATCH v4 4/6] infiniband: cxgb4: Eliminate duplicate barriers on weakly-ordered archs

From: [email-masked] (okaya at codeaurora.org)
Date: Thu, 22 Mar 2018 08:48:35 -0400

On 2018-03-22 08:24, okaya at codeaurora.org wrote:
> On 2018-03-22 02:44, kbuild test robot wrote:
>> Hi Sinan,
>> 
>> Thank you for the patch! Yet something to improve:
>> 
>> [auto build test ERROR on linus/master]
>> [also build test ERROR on v4.16-rc6 next-20180321]
>> [if your patch is applied to the wrong git tree, please drop us a note
>> to help improve the system]
>> 
>> url:
>> https://github.com/0day-ci/linux/commits/Sinan-Kaya/ib-Eliminate-duplicate-barriers-on-weakly-ordered-archs/20180321-091659
>> config: xtensa-allyesconfig (attached as .config)
>> compiler: xtensa-linux-gcc (GCC) 7.2.0
>> reproduce:
>>         wget
>> https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross
>> -O ~/bin/make.cross
>>         chmod +x ~/bin/make.cross
>>         # save the attached .config to linux build tree
>>         make.cross ARCH=xtensa
>> 
> 
> Jason,
> 
> Can you remove the writeq change if it is too late for me to fix?
> 
> This is an infrastructural issue on xtensa arch.
> 
> Probably, it won't get fixed today.

AFAIS, even writeq won't compile on this arch. I started questioning 
this build test.

> 
> Sinan
> 
> 
>> All errors (new ones prefixed by >>):
>> 
>>    In file included from drivers/infiniband/hw/cxgb4/iw_cxgb4.h:73:0,
>>                     from drivers/infiniband/hw/cxgb4/device.c:40:
>>    drivers/infiniband/hw/cxgb4/t4.h: In function 'pio_copy':
>>>> drivers/infiniband/hw/cxgb4/t4.h:460:3: error: implicit declaration 
>>>> of function 'writeq_relaxed'; did you mean 'writel_relaxed'? 
>>>> [-Werror=implicit-function-declaration]
>>       writeq_relaxed(*src, dst);
>>       ^~~~~~~~~~~~~~
>>       writel_relaxed
>>    cc1: some warnings being treated as errors
>> 
>> vim +460 drivers/infiniband/hw/cxgb4/t4.h
>> 
>>    450
>>    451	/* This function copies 64 byte coalesced work request to 
>> memory
>>    452	 * mapped BAR2 space. For coalesced WRs, the SGE fetches data
>>    453	 * from the FIFO instead of from Host.
>>    454	 */
>>    455	static inline void pio_copy(u64 __iomem *dst, u64 *src)
>>    456	{
>>    457		int count = 8;
>>    458
>>    459		while (count) {
>>  > 460			writeq_relaxed(*src, dst);
>>    461			src++;
>>    462			dst++;
>>    463			count--;
>>    464		}
>>    465	}
>>    466
>> 
>> ---
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