linux-kernel - Re: [PATCH v3 02/18] cacheinfo: Introduce cache id

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Date:   Sat, 8 Oct 2016 12:10:47 -0500
From:   Nilay Vaish <nilayvaish@...il.com>
To:     Fenghua Yu <fenghua.yu@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <h.peter.anvin@...el.com>,
        Ingo Molnar <mingo@...e.hu>, Tony Luck <tony.luck@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephane Eranian <eranian@...gle.com>,
        Borislav Petkov <bp@...e.de>,
        Dave Hansen <dave.hansen@...el.com>, Shaohua Li <shli@...com>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Sai Prakhya <sai.praneeth.prakhya@...el.com>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH v3 02/18] cacheinfo: Introduce cache id

On 7 October 2016 at 21:45, Fenghua Yu <fenghua.yu@...el.com> wrote:
> From: Fenghua Yu <fenghua.yu@...el.com>
>
> diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
> index e9fd32e..2a21c15 100644
> --- a/drivers/base/cacheinfo.c
> +++ b/drivers/base/cacheinfo.c
> @@ -233,6 +233,7 @@ static ssize_t file_name##_show(struct device *dev,         \
>         return sprintf(buf, "%u\n", this_leaf->object);         \
>  }
>
> +show_one(id, id);
>  show_one(level, level);
>  show_one(coherency_line_size, coherency_line_size);
>  show_one(number_of_sets, number_of_sets);
> @@ -314,6 +315,7 @@ static ssize_t write_policy_show(struct device *dev,
>         return n;
>  }
>
> +static DEVICE_ATTR_RO(id);
>  static DEVICE_ATTR_RO(level);
>  static DEVICE_ATTR_RO(type);
>  static DEVICE_ATTR_RO(coherency_line_size);
> @@ -327,6 +329,7 @@ static DEVICE_ATTR_RO(shared_cpu_list);
>  static DEVICE_ATTR_RO(physical_line_partition);
>
>  static struct attribute *cache_default_attrs[] = {
> +       &dev_attr_id.attr,
>         &dev_attr_type.attr,
>         &dev_attr_level.attr,
>         &dev_attr_shared_cpu_map.attr,
> @@ -350,6 +353,8 @@ cache_default_attrs_is_visible(struct kobject *kobj,
>         const struct cpumask *mask = &this_leaf->shared_cpu_map;
>         umode_t mode = attr->mode;
>
> +       if ((attr == &dev_attr_id.attr) && this_leaf->attributes & CACHE_ID)

Can you put parentheses around 'this_leaf->attributes & CACHE_ID'?
Whenever I look at expressions using bitwise operators without
parentheses, I have to lookup the precedence table to make sure
everything is fine.

--
Nilay