linux-kernel - Re: [PATCH v11 5/8] clocksource/drivers/arm_arch

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Date:   Wed, 7 Sep 2016 17:23:43 +0800
From:   Fu Wei <fu.wei@...aro.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        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, 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@...hat.com, Arnd Bergmann <arnd@...db.de>,
        Wim Van Sebroeck <wim@...ana.be>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
        Leo Duran <leo.duran@....com>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v11 5/8] clocksource/drivers/arm_arch_timer: Simplify ACPI
 support code.

Hi Thomas

On 6 September 2016 at 22:36, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Tue, 6 Sep 2016, fu.wei@...aro.org wrote:
>> +     if (timer_count < 0)
>> +             pr_err("Failed to get platform timer info, skipping.\n");
>
> So this prints something about skipping. But then it continues as if
> nothing went wrong. That's either wrong or confusing or both.

yes, you are right, this info is confusing.
maybe we just delete the "skipping" ?

“timer_count < 0” is caused by some firmware bug, in gtdt.c:
----
int __init acpi_gtdt_init(struct acpi_table_header *table)
{
......
        if (start < (void *)table + sizeof(struct acpi_table_gtdt)) {
        pr_err(FW_BUG "Failed to retrieve timer info from firmware:
invalid data.\n");
        return -EINVAL;
......
}
----

But in this situation( without platform timers ), system still can work.
So I thing we just need to print a error.

>
>> -     arch_timer_init();
>> -     return 0;
>> +     return arch_timer_init();
>
> Thanks,
>
>         tglx



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat