linux-kernel - Re: [PATCH] scsi: ipr: fix build on 32-bit architectures

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Date:   Fri, 8 Jun 2018 15:39:23 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Brian King <brking@...ux.vnet.ibm.com>,
        Arnd Bergmann <arnd@...db.de>
Cc:     Brian King <brking@...ibm.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Kees Cook <keescook@...omium.org>,
        Hannes Reinecke <hare@...e.com>,
        Souptick Joarder <jrdr.linux@...il.com>,
        Wen Xiong <wenxiong@...ux.vnet.ibm.com>,
        Bart Van Assche <bart.vanassche@....com>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Will Deacon <will.deacon@....com>
Subject: Re: [PATCH] scsi: ipr: fix build on 32-bit architectures

On 6/8/2018 3:20 PM, Brian King wrote:
>> I don't think there is a consensus about using these includes in the community.
>> I bumped into this issue before and came up with an include you pointed.
>> I didn't get too much enthusiasm from the maintainer.
>>
>> Why are we pushing the responsibility into the drivers? I'd think that architecture
>> should take care of this. Is there a portability issue that I'm missing from some
>> architecture I never heart of? (I work on Little-Endian machines most of the time)
> The attributes of the adapter hardware can have an impact here. The ipr hardware, for
> example, depends on the upper 4 bytes to be written first, then the lower 4 bytes
> to be written second, and its the act of writing the lower 4 bytes that triggers
> the adapter hardware to read the value and take action on it.

Thanks, I never thought about this.

-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.