From: "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
To: outreachy@lists.linux.dev, Jaehee Park <jhpark1013@gmail.com>
Subject: Re: patch idea for wfx
Date: Thu, 31 Mar 2022 19:40:54 +0200 [thread overview]
Message-ID: <2109950.Mh6RI2rZIc@leap> (raw)
In-Reply-To: <20220331141434.GA1104155@jaehee-ThinkPad-X1-Extreme>
On gioved? 31 marzo 2022 16:14:34 CEST Jaehee Park wrote:
>
> [...]
>
> I'm not entirely sure why container_of structure is helpful. But this article seems to say it makes runtime faster: http://www.kroah.com/log/linux/container_of.html
Hi Jaehee,
container_of() is widely used in Linux kernel code. It's a macro whose purpose
is to return the address of the struct that contains a given field. Users pass
a pointer to the field, the name of the struct, and the name of the field and
it returns a pointer to the embedding struct.
It's faster than other means because it's a macro that makes subtractions on
pointers.
Many in-kernel data structures, like the doubly linked lists API, use it for
convenience and type safety.
Regards,
Fabio M. De Francesco
next prev parent reply other threads:[~2022-03-31 17:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-31 14:14 patch idea for wfx Jaehee Park
2022-03-31 17:40 ` Fabio M. De Francesco [this message]
2022-03-31 17:52 ` Stefano Brivio
2022-03-31 21:47 ` Jaehee Park
2022-03-31 22:12 ` Stefano Brivio
2022-04-06 4:28 ` Jaehee Park
2022-04-06 13:54 ` Fabio M. De Francesco
2022-04-06 14:24 ` Jaehee Park
2022-04-06 16:04 ` Fabio M. De Francesco
2022-04-07 1:57 ` Jaehee Park
2022-04-06 15:41 ` Stefano Brivio
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