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Howlett" , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonathan Corbet , Shuah Khan Subject: [PATCH 7/8] mm/khugepaged: clarify a comment regarding max_ptes_none check Date: Mon, 6 Jul 2026 09:44:54 -0600 Message-ID: <20260706154500.39178-8-npache@redhat.com> In-Reply-To: <20260706154500.39178-1-npache@redhat.com> References: <20260706154500.39178-1-npache@redhat.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 While reading collapse_scan_pmd, one may be confused on where the deferred max_ptes_none check is done. Expand on this current comment by explaining which function the max_ptes_none check is now done. Suggested-by: David Hildenbrand Signed-off-by: Nico Pache --- mm/khugepaged.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 3c6f1254deca..388045a524a3 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1728,7 +1728,8 @@ static enum scan_result collapse_scan_pmd(struct mm_struct *mm, /* * If PMD is the only enabled order, enforce max_ptes_none, otherwise - * scan all pages to populate the bitmap for mTHP collapse. + * scan all pages to populate the bitmap for mTHP collapse. The bitmap + * is then checked again in mthp_collapse() for each attempted order. */ if (enabled_orders != BIT(HPAGE_PMD_ORDER)) ctx.max_ptes_none = KHUGEPAGED_MAX_PTES_LIMIT; -- 2.54.0