linux-kernel - Re: [PATCH 2/2] mtd: atmel-quadspi: add driver for Atmel QSPI controller

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Date:	Mon, 18 Jul 2016 21:35:39 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	Cyrille Pitchen <cyrille.pitchen@...el.com>,
	linux-mtd@...ts.infradead.org, nicolas.ferre@...el.com,
	boris.brezillon@...e-electrons.com, marex@...x.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mtd: atmel-quadspi: add driver for Atmel QSPI controller

On Friday, July 15, 2016 5:45:07 PM CEST Brian Norris wrote:
> Applied to l2-mtd.git with that fixup.

I'm getting this build error now on a randconfig build:

drivers/mtd/built-in.o: In function `atmel_qspi_run_command':
:(.text+0x1ee3c): undefined reference to `_memcpy_toio'
:(.text+0x1ee48): undefined reference to `_memcpy_fromio'

On ARCH_EBSA, which doesn't build the file that contains the two
functions. I don't see any other driver on ARM using those two
functions directly. What is the specific reason for using them
here? Do you require byte-wise accesses, or could you use
the normal memcpy_toio/memcpy_fromio that turn into aligned
32-bit word accesses instead? If you have to use the non-portable
functions, maybe we can just make the driver depend on !ARCH_EBSA?

	Arnd