linux-kernel - Re: [PATCH 02/13] PCI/P2PDMA: Fix the warning condition in p2pmem_alloc

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Message-ID: <20260107203439.GA446340@bhelgaas>
Date: Wed, 7 Jan 2026 14:34:39 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Christoph Hellwig <hch@....de>
Cc: Logan Gunthorpe <logang@...tatee.com>, Hou Tao <houtao@...weicloud.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-mm@...ck.org, linux-nvme@...ts.infradead.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Alistair Popple <apopple@...dia.com>,
	Leon Romanovsky <leonro@...dia.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tejun Heo <tj@...nel.org>, "Rafael J . Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>,
	Sagi Grimberg <sagi@...mberg.me>, houtao1@...wei.com
Subject: Re: [PATCH 02/13] PCI/P2PDMA: Fix the warning condition in
 p2pmem_alloc_mmap()

On Wed, Jan 07, 2026 at 11:17:24AM -0600, Bjorn Helgaas wrote:
> On Wed, Jan 07, 2026 at 03:39:42PM +0100, Christoph Hellwig wrote:
> > On Mon, Dec 22, 2025 at 09:50:18AM -0700, Logan Gunthorpe wrote:
> > > > Fixes: b7e282378773 ("mm/mm_init: move p2pdma page refcount initialisation to p2pdma")
> > > > Signed-off-by: Hou Tao <houtao1@...wei.com>
> > > 
> > > Thanks for the fix
> > > 
> > > Reviewed-by: Logan Gunthorpe <logang@...tatee.com>
> > 
> > Can we get these fixes queued up ASAP while discussing the new
> > feature?
> 
> I assume you mean the first two patches:
> 
>   PCI/P2PDMA: Release the per-cpu ref of pgmap when vm_insert_page() fails
>   PCI/P2PDMA: Fix the warning condition in p2pmem_alloc_mmap()
> 
> I can certainly queue these up.  The second is a warning fix, and the
> first fixes a hang that has apparently been around since v6.2
> (7e9c7ef83d78 ("PCI/P2PDMA: Allow userspace VMA allocations through
> sysfs")).
> 
> Given that, I would ordinarily target the v6.20 merge window, but the
> "ASAP" suggests more urgency.  Do you want one or both for v6.19?

I put the patches above on pci/p2pdma for v6.20 until I hear
otherwise.

Bjorn