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Date:   Wed, 27 Feb 2019 19:04:31 +1100
From:   "Alastair D'Silva" <alastair@...ilva.org>
To:     "'Andrew Donnellan'" <andrew.donnellan@....ibm.com>,
        "'Alastair D'Silva'" <alastair@....ibm.com>
Cc:     "'Greg Kurz'" <groug@...d.org>,
        "'Frederic Barrat'" <fbarrat@...ux.ibm.com>,
        "'Arnd Bergmann'" <arnd@...db.de>,
        "'Greg Kroah-Hartman'" <gregkh@...uxfoundation.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/5] ocxl: Rename struct link to ocxl_link

> -----Original Message-----
> From: Andrew Donnellan <andrew.donnellan@....ibm.com>
> Sent: Wednesday, 27 February 2019 6:55 PM
> To: Alastair D'Silva <alastair@...ilva.org>; 'Alastair D'Silva'
> <alastair@....ibm.com>
> Cc: 'Greg Kurz' <groug@...d.org>; 'Frederic Barrat'
> <fbarrat@...ux.ibm.com>; 'Arnd Bergmann' <arnd@...db.de>; 'Greg Kroah-
> Hartman' <gregkh@...uxfoundation.org>; linuxppc-dev@...ts.ozlabs.org;
> linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 1/5] ocxl: Rename struct link to ocxl_link
> 
> On 27/2/19 6:34 pm, Alastair D'Silva wrote:>>> diff --git
> a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c index
> >>> e6a607488f8a..16eb8a60d5c7 100644
> >>> --- a/drivers/misc/ocxl/file.c
> >>> +++ b/drivers/misc/ocxl/file.c
> >>> @@ -152,7 +152,7 @@ static long afu_ioctl_enable_p9_wait(struct
> >>> ocxl_context *ctx,
> >>>
> >>>    		if (status == ATTACHED) {
> >>>    			int rc;
> >>> -			struct link *link = ctx->afu->fn->link;
> >>> +			void *link = ctx->afu->fn->link;
> >>
> >> This doesn't look like a rename...
> >
> > That corrects the type to what the member (and prototype for
> ocxl_link_update_pe) declare it as.
> >
> > The struct link there is bogus, it shouldn't even compile (since the intended
> struct link is defined in a different compilation unit), but instead picks up a
> different definition of 'struct link' from elsewhere.
> >
> 
> Given there's only a handful of struct links defined across the entire kernel,
> I'm going to guess that the definition it's picking up is in fact the ocxl one.
> 

Unlikely, since that's never in a header. It wasn't caught since it was assigned to/from a void*.

> I think the better solution here is to move struct ocxl_link into
> ocxl_internal.h, change ocxl_fn::link to be struct ocxl_link * rather than void
> *, and update the function signature for ocxl_link_update_pe() as well.
 
Not move it, but we could have an opaque declaration there.

-- 
Alastair D'Silva           mob: 0423 762 819
skype: alastair_dsilva     msn: alastair@...ilva.org
blog: http://alastair.d-silva.org    Twitter: @EvilDeece

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