linux-kernel - Re: [PATCH] mtd: bcm47xxsflash: use devm_ioremap

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Message-ID: <CACna6rxapx_hPR9qWtGx+gDOiXvCWNiGZ=y0BG0uyLBVmtBOvA@mail.gmail.com>
Date:	Fri, 8 Jan 2016 16:26:21 +0100
From:	Rafał Miłecki <zajec5@...il.com>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	Brian Norris <computersforpeace@...il.com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Luis de Bethencourt <luisbg@....samsung.com>,
	Jeremy Kerr <jk@...abs.org>,
	Neelesh Gupta <neelegup@...ux.vnet.ibm.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Cyril Bur <cyrilbur@...il.com>
Subject: Re: [PATCH] mtd: bcm47xxsflash: use devm_ioremap_nocache() instead of KSEG0ADDR()

On 8 January 2016 at 15:01, Maciej W. Rozycki <macro@...ux-mips.org> wrote:
> On Fri, 8 Jan 2016, Rafał Miłecki wrote:
>
>> > This removes some (implicit) MIPS dependencies and makes the code more
>> > portable, whether we need it or not :)
>>
>> So now we have following forwardtrace:
>> devm_ioremap_nocache
>> ioremap_nocache
>> __ioremap_mode
>> __ioremap
>> CKSEG1ADDR
>>
>> It results in different address than KSEG0ADDR:
>> [    1.339752] [bcm47xxsflash_bcma_probe] KSEG0ADDR(BCMA_SOC_FLASH2):9c000000
>> [    1.346848] [bcm47xxsflash_bcma_probe] devm_ioremap_nocache:bc000000
>>
>> But it still works as expected! :)
>> [    1.609426] 6 bcm47xxpart partitions found on MTD device bcm47xxsflash
>> [    1.616169] Creating 6 MTD partitions on "bcm47xxsflash":
>
>  It is a functional change though and I think the change from a cached to
> uncached mapping (i.e. from `ioremap' to `ioremap_nocache') has to be a
> separate patch, so that both changes can be reviewed independently.

We didn't switch from 'ioremap' but from KSEG0ADDR. What exactly
should be a separated patch?

-- 
Rafał