linux-kernel - Re: [PATCH v2] nouveau/hmm: map pages after migration

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Message-ID: <20200304162752.GB11616@lst.de>
Date:   Wed, 4 Mar 2020 17:27:52 +0100
From:   Christoph Hellwig <hch@....de>
To:     Ralph Campbell <rcampbell@...dia.com>
Cc:     Jason Gunthorpe <jgg@...lanox.com>,
        dri-devel@...ts.freedesktop.org, linux-rdma@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        nouveau@...ts.freedesktop.org, Jerome Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ben Skeggs <bskeggs@...hat.com>
Subject: Re: [PATCH v2] nouveau/hmm: map pages after migration

On Tue, Mar 03, 2020 at 01:15:21PM -0800, Ralph Campbell wrote:
>>> +static inline struct nouveau_pfnmap_args *
>>> +nouveau_pfns_to_args(void *pfns)
>>
>> don't use static inline inside C files
>
> OK.
>
>>> +{
>>> +	struct nvif_vmm_pfnmap_v0 *p =
>>> +		container_of(pfns, struct nvif_vmm_pfnmap_v0, phys);
>>> +
>>> +	return container_of(p, struct nouveau_pfnmap_args, p);
>>
>> And this should just be
>>
>>     return container_of(pfns, struct nouveau_pfnmap_args, p.phys);
>
> Much simpler, thanks.

Btw, for the case where we just have an container_of wrapper I strongly
disagree with avoiding the inline - not inlining this would be stupid,
but unfortunately compilers often behave stupidly.  It also is a very
clear marker.