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After the introduction of clear_pages() we exploit the fact that the process vm_area is allocated in contiguous pages to just clear them all in one swift operation. Link: https://lkml.kernel.org/r/20260224-mm-fork-clear-pages-v1-1-184c65a72d49@kernel.org Signed-off-by: Linus Walleij <linusw@kernel.org> Suggested-by: Mateusz Guzik <mjguzik@gmail.com> Link: https://lore.kernel.org/linux-mm/dpnwsp7dl4535rd7qmszanw6u5an2p74uxfex4dh53frpb7pu3@2bnjjavjrepe/ Suggested-by: Pasha Tatashin <pasha.tatashin@soleen.com> Link: https://lore.kernel.org/20240311164638.2015063-7-pasha.tatashin@soleen.com Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org> Cc: Ankur Arora <ankur.a.arora@oracle.com> Cc: Ben Segall <bsegall@google.com> Cc: David Hildenbrand <david@kernel.org> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Kees Cook <kees@kernel.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Valentin Schneider <vschneid@redhat.com> Cc: Vincent Guittot <vincent.guittot@linaro.org> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>