linux-kernel - Re: [PATCH] ARM: Use udiv/sdiv for __aeabi_{u}idiv library functions

Open Source and information security mailing list archives

Date:	Fri, 8 Nov 2013 12:50:04 +0100
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: Use udiv/sdiv for __aeabi_{u}idiv library functions

On 19:34 Thu 07 Nov     , Rob Herring wrote:
> On Thu, Nov 7, 2013 at 1:20 PM, Stephen Boyd <sboyd@...eaurora.org> wrote:
> > If we're running on a v7 ARM CPU, detect if the CPU supports the
> > sdiv/udiv instructions and replace the signed and unsigned
> > division library functions with an sdiv/udiv instruction.
> 
> [snip]
> 
> > diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
> > index bd454b0..6ed6496 100644
> > --- a/arch/arm/lib/Makefile
> > +++ b/arch/arm/lib/Makefile
> > @@ -15,6 +15,9 @@ 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
> > +CFLAGS_div-v7.o := -march=armv7-a
> 
> Won't this fail to build if the compiler doesn't have armv7-a support.
> Perhaps we don't care about compilers that old.

use the propoer compiler to compile a armv7 kernel

Best Regards,
J.
> 
> Rob
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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