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Message-ID: <20250603133659.GD386142@ziepe.ca> Date: Tue, 3 Jun 2025 10:36:59 -0300 From: Jason Gunthorpe <jgg@...pe.ca> To: Alistair Popple <apopple@...dia.com> Cc: linux-mm@...ck.org, gerald.schaefer@...ux.ibm.com, dan.j.williams@...el.com, willy@...radead.org, david@...hat.com, linux-kernel@...r.kernel.org, nvdimm@...ts.linux.dev, linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org, jhubbard@...dia.com, hch@....de, zhang.lyra@...il.com, debug@...osinc.com, bjorn@...nel.org, balbirs@...dia.com, lorenzo.stoakes@...cle.com, linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev, linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org, linux-cxl@...r.kernel.org, dri-devel@...ts.freedesktop.org, John@...ves.net Subject: Re: [PATCH 03/12] mm/pagewalk: Skip dax pages in pagewalk On Thu, May 29, 2025 at 04:32:04PM +1000, Alistair Popple wrote: > Previously dax pages were skipped by the pagewalk code as pud_special() or > vm_normal_page{_pmd}() would be false for DAX pages. Now that dax pages are > refcounted normally that is no longer the case, so add explicit checks to > skip them. > > Signed-off-by: Alistair Popple <apopple@...dia.com> > --- > include/linux/memremap.h | 11 +++++++++++ > mm/pagewalk.c | 12 ++++++++++-- > 2 files changed, 21 insertions(+), 2 deletions(-) But why do we want to skip them? Like hmm uses pagewalk and it would like to see DAX pages? I guess it makes sense from the perspective of not changing things, but it seems like a comment should be left behind explaining that this is just for legacy reasons until someone audits the callers. Jason
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