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

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Message-ID: <1415903324.4223.5.camel@perches.com>
Date:	Thu, 13 Nov 2014 10:28:44 -0800
From:	Joe Perches <joe@...ches.com>
To:	"Jon Medhurst (Tixy)" <tixy@...aro.org>
Cc:	Vinod Koul <vinod.koul@...el.com>, dmaengine@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: pl330: Fix linker error "undefined reference
 to `__aeabi_uldivmod'"

On Thu, 2014-11-13 at 18:19 +0000, Jon Medhurst (Tixy) wrote:
> There are many ways to code the limiting of the burst width, but as it
> starts out as the data bus width the DMA can handle (maximum 16 bytes)
> then at most we'll be going round the existing while loop 4 times so I
> don't think it's that much overhead, and probably less code size than
> using ffs.

For arm, isn't ffs just a few instruction with no loops?

> And as the driver has been broken for the unaligned memcpy case since
> the day it was added then I can't see that anyone is actually using it
> that way anyway, so all existing users (if any) must already be doing
> bus aligned copies and the current while loop will iterate zero times.

That's probably right, I just don't like reading
while loops where ffs/fls might be suitable.

> That's probably enough bikeshedding from me :-)

;)  Me too.  cheers, Joe


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