From: peterghamilton@gmail.com (Peter Hamilton)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Struct Inheritance in drivers/ata/
Date: Thu, 26 May 2011 14:46:08 -0600 [thread overview]
Message-ID: <BANLkTimjsJEZKqzX=btryBoXD0FNAsW8Ag@mail.gmail.com> (raw)
The code in drivers/ata/ uses an implementation of inheritance that I have
not seen before. It's only briefly explained in the header file (
include/linux/libata.h:885):
/*
* ->inherits must be the last field and all the preceding
* fields must be pointers.
*/
The structs are then initialized with .inherits assigned first:
drivers/ata/sata_nv.c:475
static struct ata_port_operations nv_nf2_ops = {
.inherits = &nv_generic_ops,
.freeze = nv_nf2_freeze,
.thaw = nv_nf2_thaw,
};
Is this actually implementing inheritance? Why do all preceding fields need
to be pointers?
As far as I can tell, this style is only found in the ata drivers.
Could anyone explain how this works?
Thanks,
Peter
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next reply other threads:[~2011-05-26 20:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-26 20:46 Peter Hamilton [this message]
2011-05-27 1:23 ` Struct Inheritance in drivers/ata/ Greg KH
2011-05-27 2:20 ` Peter Hamilton
2011-05-27 4:49 ` Ankit Jain
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