From: "Oscar Salvador (SUSE)" <osalvador@kernel.org>
To: "David Hildenbrand (Arm)" <david@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>,
Andreas Larsson <andreas@gaisler.com>,
Andrew Morton <akpm@linux-foundation.org>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R. Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>, Jann Horn <jannh@google.com>,
Peter Zijlstra <peterz@infradead.org>,
sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH 2/3] mm: drop pte_clear_not_present_full()
Date: Thu, 11 Jun 2026 15:49:31 +0200 [thread overview]
Message-ID: <aiq86-eKAeDi-CQd@localhost.localdomain> (raw)
In-Reply-To: <20260611-clear_not_present_full_ptes-v1-2-49865fc82629@kernel.org>
On Thu, Jun 11, 2026 at 01:50:48PM +0200, David Hildenbrand (Arm) wrote:
> In general, there is no good reason to do anything special when clearing
> non-present PTEs.
>
> In theory, HW that does have to invalidate TLBs for non-present PTEs could
> benefit from a "full" parameter, but fortunately
That would be on arches like arm64 where it can cache non-present
entries, right?
Then, we could signal a global invalidation instead of doing per page.
> pte_clear_not_present_full() is not wired up anymore ... and there would
> have to be something very convincing for us to care about that to re-add
> it.
>
> So, let's just use pte_clear() directly now.
>
> Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Oscar Salvador (SUSE) <osalvador@kernel.org>
--
Oscar Salvador
SUSE Labs
next prev parent reply other threads:[~2026-06-11 13:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-11 11:50 [PATCH 0/3] mm: cleanup clear_not_present_full_ptes() David Hildenbrand (Arm)
2026-06-11 11:50 ` [PATCH 1/3] sparc/mm: drop custom pte_clear_not_present_full() David Hildenbrand (Arm)
2026-06-11 11:50 ` [PATCH 2/3] mm: drop pte_clear_not_present_full() David Hildenbrand (Arm)
2026-06-11 13:49 ` Oscar Salvador (SUSE) [this message]
2026-06-11 14:57 ` David Hildenbrand (Arm)
2026-06-11 11:50 ` [PATCH 3/3] mm: cleanup clear_not_present_full_ptes() and rename to clear_non_present_ptes() David Hildenbrand (Arm)
2026-06-11 14:02 ` Oscar Salvador (SUSE)
2026-06-11 16:14 ` David Hildenbrand (Arm)
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