linux-kernel - Re: [PATCH 0/2] Make PPC macro spin_event

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Date:	Tue, 30 Jul 2013 15:08:43 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arpit Goel <B44344@...escale.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	Philip Blundell <philb@....org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux390@...ibm.com, "David S. Miller" <davem@...emloft.net>,
	Rob Herring <rob.herring@...xeda.com>,
	Arnd Bergmann <arnd@...db.de>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Stephen Warren <swarren@...dia.com>,
	John Stultz <john.stultz@...aro.org>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Sam Ravnborg <sam@...nborg.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-m32r@...linux-m32r.org, linux-m32r-ja@...linux-m32r.org,
	"Linux/m68k" <linux-m68k@...r.kernel.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	sparclinux <sparclinux@...r.kernel.org>
Subject: Re: [PATCH 0/2] Make PPC macro spin_event_timeout() architecture independent

On Tue, Jul 30, 2013 at 2:38 PM, Arpit Goel <B44344@...escale.com> wrote:
> This patch-set moves USECS_PER_JIFFY to architecture timex.h from architecture
> specific C files. Patch-set further uses this to make PPC macro
> spin_event_timeout() architecture independent. This change enables drivers to
> use spin_event_timeout() even in non-PowerPC based SoC's.
>
> This patchset has been compiled for ARM, PowerPC and x86.
>
> Patch[1/2] : Moves USECS_PER_JIFFY to architecture specific timex.h files from
>              architecture specific C files.

>  arch/arm/include/asm/timex.h      |  2 ++
>  arch/arm/kernel/time.c            |  3 ---
>  arch/m32r/include/asm/timex.h     |  2 ++
>  arch/m32r/kernel/time.c           |  3 ---
>  arch/m68k/hp300/time.c            |  4 +---
>  arch/m68k/include/asm/timex.h     |  2 ++
>  arch/s390/include/asm/timex.h     |  2 ++
>  arch/s390/kernel/time.c           |  2 --
>  arch/sparc/include/asm/timex_32.h |  2 ++
>  arch/sparc/include/asm/timex_64.h |  2 ++
>  arch/sparc/kernel/pcic.c          |  1 -

As the definition is the same on all architectures, why not move it to
<linux/delay.h>?

> Patch[2/2] : Converts PPC macro spin_event_timeout() in architecture independent
>              macro.

>  include/linux/delay.h             | 40 +++++++++++++++++++++++++++++++++++++++

After your first patch, USECS_PER_JIFFY is still available only on
arm/m32r/m68k/s390/sparc. What about other architectures?
If anyone uses spin_event_timeout() on e.g. x86, it will fail to compile.

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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