linux-kernel - Re: [PATCH 1/6] x86/platform/uv/BAU: Declare bau_operations struct after other BAU structs

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Date:   Thu, 16 Feb 2017 19:00:28 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andrew Banman <abanman@....com>
cc:     mingo@...hat.com, akpm@...ux-foundation.org, hpa@...or.com,
        mike.travis@....com, rja@....com, sivanich@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] x86/platform/uv/BAU: Declare bau_operations struct
 after other BAU structs

On Tue, 14 Feb 2017, Andrew Banman wrote:

> We must declare bau_operations after the other BAU structs so that we may
> reference them in the bau_operations function declarations.

This changelog is misleading. I really had to look twice to figure out that
this is just a preparatory patch for adding stuff which references a bau
struct later. There is no 'MUST declare after'. You always can forward
declare structs when you only use a pointer in the struct op
declaration. Sure you can avoid it, but then please tell so, e.g.:

  Move the bau_operations declaration after bau struct declaration so the
  bau structs can be referenced when adding new functions to
  bau_operations. That way we avoid forward declarations of the bau
  structs.

Hmm?

>  
> +/* Abstracted BAU functions */
> +struct bau_operations {
> +	unsigned long	(*read_l_sw_ack)(void);
> +	unsigned long	(*read_g_sw_ack)(int pnode);
> +	unsigned long	(*bau_gpa_to_offset)(unsigned long vaddr);
> +	void		(*write_l_sw_ack)(unsigned long mmr);
> +	void		(*write_g_sw_ack)(int pnode, unsigned long mmr);
> +	void		(*write_payload_first)(int pnode, unsigned long mmr);
> +	void		(*write_payload_last)(int pnode, unsigned long mmr);

I appreciate that you made them tabular aligned!

Thanks,

	tglx