linux-kernel - Re: [PATCH] dmaengine: pl330: Fix linker error "undefined reference to `__aeabi

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Message-ID: <1799482.v2vqT9blFd@wuerfel>
Date:	Thu, 13 Nov 2014 17:49:05 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Vinod Koul <vinod.koul@...el.com>, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: pl330: Fix linker error "undefined reference to `__aeabi_uldivmod'"

On Thursday 13 November 2014 16:27:27 Jon Medhurst wrote:
> 32-bit ARM kernels may have a 64-bit dma_addr_t but have no
> implementation of the compiler helper for 64-bit unsigned division,
> therefore the use of the modulo operator in pl330_prep_dma_memcpy causes
> the link error "undefined reference to `__aeabi_uldivmod'"
> 
> As the burst value is always a power of two we can fix the problem, and
> make the code more efficient, by replacing "% burst" with "& (burst-1)".
> 
> Reported-by: kbuild test robot <fengguang.wu@...el.com>
> Signed-off-by: Jon Medhurst <tixy@...aro.org>
> 

Just saw the same thing and was going to send a different patch, but
yours is better.

Acked-by: Arnd Bergmann <arnd@...db.de>
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