linux-kernel - Re: [PATCH v3 1/9] kernel/resource: Introduce request_muxed_mem

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Date:   Thu, 20 Jan 2022 13:16:44 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Terry Bowman <terry.bowman@....com>
Cc:     Guenter Roeck <linux@...ck-us.net>, linux-watchdog@...r.kernel.org,
        Jean Delvare <jdelvare@...e.com>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Wolfram Sang <wsa@...nel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Robert Richter <rrichter@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        sudheesh.mavila@....com,
        "Shah, Nehal-bakulchandra" <Nehal-bakulchandra.Shah@....com>,
        Basavaraj Natikar <Basavaraj.Natikar@....com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Mario Limonciello <Mario.Limonciello@....com>
Subject: Re: [PATCH v3 1/9] kernel/resource: Introduce request_muxed_mem_region()

On Thu, Jan 20, 2022 at 1:06 AM Terry Bowman <terry.bowman@....com> wrote:
>
> Support for requesting muxed memory region is implemented but not
> currently callable as a macro. Add the request muxed memory
> region macro.
>
> MMIO memory accesses can be synchronized using request_mem_region() which
> is already available. This call will return failure if the resource is
> busy. The 'muxed' version of this macro will handle a busy resource by
> using a wait queue to retry until the resource is available.

...

> @@ -262,6 +262,8 @@ resource_union(struct resource *r1, struct resource *r2, struct resource *r)
>  #define request_muxed_region(start,n,name)     __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
>  #define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
>  #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)

> +#define request_muxed_mem_region(start, n, name) \
> +       __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_MUXED)

Looking around tells me that this name is inconsistent, I would expect it to be

request_mem_region_muxed()

>  #define request_mem_region_exclusive(start,n,name) \
>         __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)

If you are fine with this, take my
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

-- 
With Best Regards,
Andy Shevchenko