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Date: Fri, 29 May 2026 16:36:19 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Lorenzo Stoakes <ljs@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>, liam@infradead.org, jgg@ziepe.ca,
 leon@kernel.org, david@kernel.org, shuah@kernel.org, vbabka@kernel.org,
 jannh@google.com, pfalcato@suse.de, rppt@kernel.org, surenb@google.com,
 mhocko@suse.com, balbirs@nvidia.com, linux-mm@kvack.org,
 linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
 linux-kselftest@vger.kernel.org, ryan.roberts@arm.com,
 anshuman.khandual@arm.com, stable@vger.kernel.org
Subject: Re: [PATCH] fs/proc/task_mmu: do not warn on seeing non-migration
 pmd entry
Message-Id: <20260529163619.fecd655a4db1f4a6543d5342@linux-foundation.org>
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On Fri, 29 May 2026 17:45:24 +0100 Lorenzo Stoakes <ljs@kernel.org> wrote:

> > +	/* Exercise pagemap on a PMD device-private entry. */
> > +	ret = hmm_read_self_pagemap(buffer->ptr, npages, self->page_size);
> > +	ASSERT_EQ(ret, 0);
> > +
> >  	/* Check what the device read. */
> >  	for (i = 0, ptr = buffer->mirror; i < size / sizeof(*ptr); ++i)
> >  		ASSERT_EQ(ptr[i], i);
> 
> Thanks for this!
> 
> though, hmm it really feels like you maybe want to add this as a test and
> make this a series :)

yes please!