[PATCH 02/13] PCI/P2PDMA: Fix the warning condition in p2pmem_alloc_mmap()

[Bjorn Helgaas]

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 at huawei.com>
> > > 
> > > Thanks for the fix
> > > 
> > > Reviewed-by: Logan Gunthorpe <logang at deltatee.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