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Date:   Sun, 8 Oct 2017 22:39:42 +0900
From:   Masahiro Yamada <>
To:     David Daney <>
        Linus Walleij <>,
        David Daney <>,
        Thomas Gleixner <>,
        Jason Cooper <>,
        Marc Zyngier <>,
        Linux Kernel Mailing List <>
Subject: Re: [PATCH] gpio: thunderx: remove unused .map() hook from irq_domain_ops

2017-09-22 6:54 GMT+09:00 David Daney <>:
> On 09/13/2017 07:37 PM, Masahiro Yamada wrote:
>> This driver implements .alloc() hook, so .map() is not used.
> Although this comment is true for this driver, it is unclear to me if the
> statement is true in the general case.

If a driver implements .alloc() hook,
irq_domain_check_hierarchy() sets IRQ_DOMAIN_FLAG_HIERARCHY flag.

If you see kernel/irq/irqdomain.c,
alloc/map is selected by irq_domain_is_hierarchy().

Best Regards
Masahiro Yamada

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