linux-kernel - Re: [RFT] ARM: shmobile: rcar-gen2: Fix build breakage

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Date:	Sun, 2 Nov 2014 10:10:11 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ulrich Hecht <ulrich.hecht+renesas@...il.com>
Subject: Re: [RFT] ARM: shmobile: rcar-gen2: Fix build breakage

On Fri, Oct 31, 2014 at 4:02 PM, Krzysztof Kozlowski
<k.kozlowski@...sung.com> wrote:
> Fix build breakage when building allmodconfig or allyesconfig introduced
> by adding ISB instruction to rcar_gen2_timer_init() function
> (9ce3fa6816c2 "ARM: shmobile: rcar-gen2: Add CA7 arch_timer
> initialization for r8a7794"):
>
>   CC      arch/arm/mach-shmobile/setup-rcar-gen2.o
> /tmp/cc770qt0.s: Assembler messages:
> /tmp/cc770qt0.s:378: Error: selected processor does not support ARM mode `isb'
> /tmp/cc770qt0.s:381: Error: selected processor does not support ARM mode `isb'
> /tmp/cc770qt0.s:383: Error: selected processor does not support ARM mode `isb'
> make[1]: *** [arch/arm/mach-shmobile/setup-rcar-gen2.o] Error 1
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> ---
>  arch/arm/mach-shmobile/setup-rcar-gen2.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/mach-shmobile/setup-rcar-gen2.c b/arch/arm/mach-shmobile/setup-rcar-gen2.c
> index 3dd6edd9bd1d..47f85643785f 100644
> --- a/arch/arm/mach-shmobile/setup-rcar-gen2.c
> +++ b/arch/arm/mach-shmobile/setup-rcar-gen2.c
> @@ -68,6 +68,7 @@ void __init rcar_gen2_timer_init(void)
>                  * secure code.
>                  */
>                 asm volatile(
> +               "       .arch   armv7-a\n"
>                 "       cps     0x16\n"
>                 "       mrc     p15, 0, r1, c1, c1, 0\n"
>                 "       orr     r0, r1, #1\n"

Shouldn't the ".arch" be reset to some generic value afterwards?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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