linux-kernel - Re: [PATCH 00/16] expand mmap_prepare functionality, port more users

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Message-ID: <20250908150404.GL616306@nvidia.com>
Date: Mon, 8 Sep 2025 12:04:04 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
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Subject: Re: [PATCH 00/16] expand mmap_prepare functionality, port more users

On Mon, Sep 08, 2025 at 03:48:36PM +0100, Lorenzo Stoakes wrote:
> But sadly some _do need_ to do extra work afterwards, most notably,
> prepopulation.

I think Jan is suggesting something more like

mmap_op()
{
   struct vma_desc desc = {};

   desc.[..] = x
   desc.[..] = y
   desc.[..] = z
   vma = vma_alloc(desc);

   ret = remap_pfn(vma)
   if (ret) goto err_vma;

   return vma_commit(vma);

err_va:
  vma_dealloc(vma);
  return ERR_PTR(ret);
}

Jason