linux-kernel - Re: [PATCH v14 1/9] clocksource/drivers/arm_arch_timer: Move enums and defines to header file

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Date:   Wed, 26 Oct 2016 16:31:55 +0800
From:   Fu Wei <fu.wei@...aro.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <marc.zyngier@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        rruigrok@...eaurora.org, "Abdulhamid, Harb" <harba@...eaurora.org>,
        Christopher Covington <cov@...eaurora.org>,
        Timur Tabi <timur@...eaurora.org>,
        G Gregory <graeme.gregory@...aro.org>,
        Al Stone <al.stone@...aro.org>, Jon Masters <jcm@...hat.com>,
        Wei Huang <wei@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
        Leo Duran <leo.duran@....com>,
        Wim Van Sebroeck <wim@...ana.be>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-watchdog@...r.kernel.org, Tomasz Nowicki <tn@...ihalf.com>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Julien Grall <julien.grall@....com>
Subject: Re: [PATCH v14 1/9] clocksource/drivers/arm_arch_timer: Move enums
 and defines to header file

Hi Mark

On 20 October 2016 at 22:45, Mark Rutland <mark.rutland@....com> wrote:
> Hi,
>
> On Thu, Sep 29, 2016 at 02:17:09AM +0800, fu.wei@...aro.org wrote:
>> diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h
>> index caedb74..6f06481 100644
>> --- a/include/clocksource/arm_arch_timer.h
>> +++ b/include/clocksource/arm_arch_timer.h
>> @@ -19,6 +19,9 @@
>
> Please add:
>
> #include <linux/bitops.h>
>
> ... immediately before the includes below; it's needed to ensure that
> BIT() is defined in all cases. Previously we were relying on implicit
> header includes, which is not good practice.

yes, you are right!
added this, thanks !

>
>>  #include <linux/timecounter.h>
>>  #include <linux/types.h>
>>
>> +#define ARCH_CP15_TIMER                      BIT(0)
>> +#define ARCH_MEM_TIMER                       BIT(1)
>
> If we're going to expose these in a header, it would be better to rename
> them to something that makes their usage/meaning clear. These should
> probably be ARCH_TIMER_TYPE_{CP15,MEM}.
>
> I guess this can wait for subsequent cleanup.
>
>> +enum ppi_nr {
>> +     PHYS_SECURE_PPI,
>> +     PHYS_NONSECURE_PPI,
>> +     VIRT_PPI,
>> +     HYP_PPI,
>> +     MAX_TIMER_PPI
>> +};
>
> Please rename this to arch_timer_ppi_nr (updating the single user in
> drivers/clocksource/arm_arch_timer.c). That'll avoid the potential for
> name clashes in files this happens to get included in (potentially
> transitively via other headers).

OK, NP, I have fixed this.

>
> With those changes (regardless of the ARCH_TIMER_TYPE_* bits):
>
> Acked-by: Mark Rutland <mark.rutland@....com>

For ARCH_TIMER_TYPE_*, maybe I should add a patch at the end of this
patchset to fix it, OK ?

Thanks for ACK :-)

>
> Thanks,
> Mark.
>
>> +
>>  #define ARCH_TIMER_PHYS_ACCESS               0
>>  #define ARCH_TIMER_VIRT_ACCESS               1
>>  #define ARCH_TIMER_MEM_PHYS_ACCESS   2
>> --
>> 2.7.4
>>



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat