linux-kernel - Re: [PATCH V2] lib/scatterlist: Add SG_CHAIN and SG

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Date:   Mon, 19 Feb 2018 10:10:23 +0000
From:   Tvrtko Ursulin <tursulin@...ulin.net>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org, bart.vanassche@....com,
        jthumshirn@...e.de, axboe@...nel.dk, chris@...is-wilson.co.uk,
        tvrtko.ursulin@...el.com
Subject: Re: [PATCH V2] lib/scatterlist: Add SG_CHAIN and SG_END macros for
 LSB encodings


On 19/02/18 04:12, Anshuman Khandual wrote:
> On 02/18/2018 12:58 AM, kbuild test robot wrote:
>> Hi Anshuman,
>>
>> Thank you for the patch! Perhaps something to improve:
>>
>> [auto build test WARNING on linus/master]
>> [also build test WARNING on v4.16-rc1 next-20180216]
>> [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/Anshuman-Khandual/lib-scatterlist-Add-SG_CHAIN-and-SG_END-macros-for-LSB-encodings/20180218-015554
>> config: x86_64-randconfig-s3-02180201 (attached as .config)
>> compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
>> reproduce:
>>          # save the attached .config to linux build tree
>>          make ARCH=x86_64
>>
>> All warnings (new ones prefixed by >>):
>>
>>     In file included from drivers/staging/rts5208/rtsx.h:180:0,
>>                      from drivers/staging/rts5208/rtsx.c:28:
>>>> drivers/staging/rts5208/rtsx_chip.h:343:0: warning: "SG_END" redefined
>>      #define SG_END   0x02
>>      
>>     In file included from include/linux/blkdev.h:28:0,
>>                      from drivers/staging/rts5208/rtsx.c:23:
>>     include/linux/scatterlist.h:69:0: note: this is the location of the previous definition
>>      #define SG_END  0x02UL
>>      
>>
>> vim +/SG_END +343 drivers/staging/rts5208/rtsx_chip.h
> 
> SG_END is already defined in a driver. Hence shall we change back
> 'SG_END' definition as 'SG_EMARK' or any other suggestions ?

Maybe SG_LAST? Going by existence of sg_is_chain and sg_is_last.

And also would probably be good to add something like:

#define SG_PAGE_BITS (SG_CHAIN | SG_LAST)
#define SG_PAGE_MASK (~SG_PAGE_BITS)

?

Regards,

Tvrtko