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Subject: Re: linux-next: build warnings after merge of the block tree
To:     Stephen Rothwell <sfr@canb.auug.org.au>,
        Jens Axboe <axboe@kernel.dk>
References: <20180301112624.652612c7@canb.auug.org.au>
Cc:     Linux-Next Mailing List <linux-next@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
From:   Anshuman Khandual <khandual@linux.vnet.ibm.com>
Date:   Thu, 1 Mar 2018 09:32:20 +0530
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On 03/01/2018 05:56 AM, Stephen Rothwell wrote:
> Hi Jens,
> 
> After merging the block tree, today's linux-next build (x86_64
> allmodconfig) produced these warning:
> 
> In file included from drivers/misc/cardreader/rts5209.c:24:0:
> include/linux/rtsx_pci.h:40:0: warning: "SG_END" redefined
>  #define   SG_END   0x02
>  
> In file included from include/linux/dmapool.h:14:0,
>                  from include/linux/pci.h:1311,
>                  from include/linux/rtsx_pci.h:26,
>                  from drivers/misc/cardreader/rts5209.c:24:
> include/linux/scatterlist.h:69:0: note: this is the location of the previous definition
>  #define SG_END  0x02UL
>  
> 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
>  
> 
> and many more the same.
> 
> Introduced by commit
> 
>   723fbf563a6a ("lib/scatterlist: Add SG_CHAIN and SG_END macros for LSB encodings")

IIRC this was already detected and hence sent a new version changing
this to SG_LAST.

https://patchwork.kernel.org/patch/10227897/