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

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Date:   Wed, 14 Feb 2018 16:11:25 +0000
From:   Tvrtko Ursulin <tursulin@...ulin.net>
To:     Johannes Thumshirn <jthumshirn@...e.de>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        bart.vanassche@....com, axboe@...nel.dk, chris@...is-wilson.co.uk,
        tvrtko.ursulin@...el.com
Subject: Re: [PATCH] lib/scatterlist: Add SG_CHAIN and SG_EMARK macros for LSB
 encodings


On 14/02/18 08:32, Johannes Thumshirn wrote:
> On Wed, 2018-02-14 at 10:28 +0530, Anshuman Khandual wrote:
>> This replaces scatterlist->page_link LSB encodings with SG_CHAIN and
>> SG_EMARK definitions without any functional change.
>>
>> Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
>> ---
>>   include/linux/scatterlist.h | 23 +++++++++++++----------
>>   1 file changed, 13 insertions(+), 10 deletions(-)
>>
>> diff --git a/include/linux/scatterlist.h
>> b/include/linux/scatterlist.h
>> index 22b2131bcdcd..63d00bdb2fb3 100644
>> --- a/include/linux/scatterlist.h
>> +++ b/include/linux/scatterlist.h
>> @@ -65,16 +65,18 @@ struct sg_table {
>>    */
>>   
>>   #define SG_MAGIC	0x87654321
>> +#define SG_CHAIN	0x01
>> +#define SG_EMARK	0x02
> 
> SG_EMARK sounds strange, what about SG_END?

+1 on SG_END.

Btw, just a cleanup for readability or you have further work in this area?

Regards,

Tvrtko