From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Juri Lelli <juri.lelli@arm.com>, linux-kernel@vger.kernel.org
Cc: linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
devicetree@vger.kernel.org, peterz@infradead.org,
vincent.guittot@linaro.org, robh+dt@kernel.org,
mark.rutland@arm.com, linux@arm.linux.org.uk,
sudeep.holla@arm.com, lorenzo.pieralisi@arm.com,
catalin.marinas@arm.com, will.deacon@arm.com,
morten.rasmussen@arm.com, broonie@kernel.org,
Mark Brown <broonie@linaro.org>
Subject: Re: [PATCH v3 6/6] arm64: add sysfs cpu_capacity attribute
Date: Fri, 5 Feb 2016 17:19:11 +0000 [thread overview]
Message-ID: <56B4D98F.3090103@arm.com> (raw)
In-Reply-To: <1454500799-18451-7-git-send-email-juri.lelli@arm.com>
Hi Juri,
On 03/02/16 11:59, Juri Lelli wrote:
> Add a sysfs cpu_capacity attribute with which it is possible to read and
> write (thus over-writing default values) CPUs capacity. This might be
> useful in situation where there is no way to get proper default values
> at boot time.
>
> The new attribute shows up as:
>
> /sys/devices/system/cpu/cpu*/cpu_capacity
>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Mark Brown <broonie@linaro.org>
> Cc: Sudeep Holla <sudeep.holla@arm.com>
> Signed-off-by: Juri Lelli <juri.lelli@arm.com>
> ---
> arch/arm64/kernel/topology.c | 68 ++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 68 insertions(+)
>
> diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
> index f2513a6..f05cc07 100644
> --- a/arch/arm64/kernel/topology.c
> +++ b/arch/arm64/kernel/topology.c
> @@ -40,6 +40,74 @@ bool arch_wants_init_cpu_capacity(void)
> return true;
> }
>
> +#ifdef CONFIG_PROC_SYSCTL
> +#include <asm/cpu.h>
> +#include <linux/string.h>
> +static ssize_t show_cpu_capacity(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct cpu *cpu = container_of(dev, struct cpu, dev);
> + ssize_t rc;
> + int cpunum = cpu->dev.id;
> + unsigned long capacity = arch_scale_cpu_capacity(NULL, cpunum);
Gives me an implicit declaration of function ‘arch_scale_cpu_capacity’
error [without the commit fbc899610e1a ("arm64: Update
arch_scale_cpu_capacity() to reflect change to define") on your
git://linux-arm.org/linux-jl.git upstream/default_caps_v3 branch].
Why don't you just return cpu_scale
@@ -49,10 +49,8 @@ static ssize_t show_cpu_capacity(struct device *dev,
{
struct cpu *cpu = container_of(dev, struct cpu, dev);
ssize_t rc;
- int cpunum = cpu->dev.id;
- unsigned long capacity = arch_scale_cpu_capacity(NULL, cpunum);
- rc = sprintf(buf, "%lu\n", capacity);
+ rc = sprintf(buf, "%lu\n", per_cpu(cpu_scale, cpu->dev.id));
return rc;
}
to get rid of this dependency?
-- Dietmar
[...]
next prev parent reply other threads:[~2016-02-05 17:19 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 11:59 [PATCH v3 0/6] CPUs capacity information for heterogeneous systems Juri Lelli
2016-02-03 11:59 ` [PATCH v3 1/6] ARM: initialize cpu_scale to its default Juri Lelli
2016-02-03 11:59 ` [PATCH v3 2/6] drivers/cpufreq: implement init_cpu_capacity_default() Juri Lelli
2016-02-03 21:04 ` Vincent Guittot
2016-02-04 9:36 ` Morten Rasmussen
2016-02-04 12:03 ` Vincent Guittot
2016-02-04 12:16 ` Juri Lelli
2016-02-04 12:35 ` Vincent Guittot
2016-02-04 14:13 ` Juri Lelli
2016-02-04 15:44 ` Vincent Guittot
2016-02-04 15:46 ` Vincent Guittot
2016-02-05 9:30 ` Juri Lelli
2016-02-09 15:54 ` Dietmar Eggemann
2016-02-10 14:25 ` Juri Lelli
2016-02-03 11:59 ` [PATCH v3 3/6] arm: Enable dynamic CPU capacity initialization Juri Lelli
2016-02-03 11:59 ` [PATCH v3 4/6] arm64: " Juri Lelli
2016-02-08 12:28 ` Dietmar Eggemann
2016-02-08 13:13 ` Mark Brown
2016-02-08 13:41 ` Dietmar Eggemann
2016-02-03 11:59 ` [PATCH v3 5/6] arm: add sysfs cpu_capacity attribute Juri Lelli
2016-02-03 11:59 ` [PATCH v3 6/6] arm64: " Juri Lelli
2016-02-05 17:19 ` Dietmar Eggemann [this message]
2016-02-05 17:49 ` Juri Lelli
2016-02-08 23:59 ` [PATCH v3 0/6] CPUs capacity information for heterogeneous systems Steve Muckle
2016-02-09 10:37 ` Juri Lelli
2016-02-09 17:30 ` Steve Muckle
2016-02-09 17:40 ` Juri Lelli
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