linux-kernel - Re: [PATCH v2] ARM: Use udiv/sdiv for __aeabi

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Date:	Mon, 11 Nov 2013 18:35:56 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
CC:	linux-arm-kernel@...ts.infradead.org,
	Måns Rullgård 
	<mans@...sr.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org,
	Christopher Covington <cov@...eaurora.org>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Subject: Re: [PATCH v2] ARM: Use udiv/sdiv for __aeabi_{u}idiv library functions

On 11/10/13 23:46, Uwe Kleine-König wrote:
> Hello,
>
> On Fri, Nov 08, 2013 at 03:00:32PM -0800, Stephen Boyd wrote:
>> diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
>> index bd454b0..38621729 100644
>> --- a/arch/arm/lib/Makefile
>> +++ b/arch/arm/lib/Makefile
>> @@ -15,6 +15,12 @@ lib-y		:= backtrace.o changebit.o csumipv6.o csumpartial.o   \
>>  		   io-readsb.o io-writesb.o io-readsl.o io-writesl.o  \
>>  		   call_with_stack.o
>>  
>> +lib-$(CONFIG_CPU_V7) += div-v7.o
> CPU_V7M could make use of that, too.
> (If you follow Nico's advice to use runtime patching I cannot test it
> for you on v7-M though as my machine has to use an XIP kernel.)
>

It already is runtime patching so I suspect you won't be able to test it
anyway. I suppose we need another config like MIGHT_HAVE_IDIV or
something that both v7 and v7M select?

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