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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Sat Oct 31, 2026 at 10:13 PM EDT, Gregory Price (Meta) wrote: > Memory hotplug rebuilds zonelists in place while allocations walk them, > so a zoneref slot can change between two loads of it. > > zonelist_zone() loads the slot with a plain access. The compiler may > load it again later instead of keeping the zone it already read, so a > caller can check one zone and then use another, or the NULL terminator. > > Use READ_ONCE(). Callers that take a zone from a slot and keep using > it, such as get_page_from_freelist() with ac->preferred_zoneref, need > that single load. > > Fixes: 11cd8638c37f ("mm, page_alloc: remove stop_machine from build_all_= zonelists") > Cc: stable@vger.kernel.org > Signed-off-by: Gregory Price (Meta) > --- > include/linux/mmzone.h | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > LGTM. Acked-by: Zi Yan --=20 Best Regards, Yan, Zi