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[80.230.48.7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48fce066eeasm50325e9.7.2026.05.12.14.07.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 May 2026 14:07:56 -0700 (PDT) Date: Tue, 12 May 2026 17:07:51 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: "David Hildenbrand (Arm)" , Jason Wang , Xuan Zhuo , Eugenio =?utf-8?B?UMOpcmV6?= , Muchun Song , Oscar Salvador , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Hugh Dickins , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo , Axel Rasmussen , Yuanchu Xie , Wei Xu , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , virtualization@lists.linux.dev, linux-mm@kvack.org, Andrea Arcangeli Subject: [PATCH v7 31/31] mm: balloon: use put_page_zeroed for zeroed balloon pages Message-ID: <13d76c12caad0008bee3d659cd986aeaf9a5fea2.1778616612.git.mst@redhat.com> References: MIME-Version: 1.0 In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: F9I1BGSluyALI38-0FGljf-UdWtoSenuk06DIkkr5Hg_1778620078 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 1F16510000D X-Stat-Signature: xg3p861sh1jzqta9ibc9gqmsn6yydi1t X-Rspam-User: X-HE-Tag: 1778620082-286853 X-HE-Meta: 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 zF450IP+ s1NCI/vmBWi33+1b7pnq42rnE+4ML+fCdsNSQ71uokt1lQPSixlzZ9+q9ih++cvoU8hYkrmmBUKxtDOhgYY4xqhA7y0tyJaH+A9Ep3LglOmllmii/pmBswqzZrITyWtUoQFywgou1Srstn58h6ltCaXaJwkBMiXuMBCTxxzYqXVyVfYWYJItF4UQ84bLO3obemRg4yUfEQ9Nk0bxYIdWz8/ctvH9SHkSpzSJVvv62fV5U8w8QuByipkUf+/qGrpKAu5+F5wN07yQudSB2hSlopc2oVITxR2RMVGI6FCDjDlE6Z4DLglFLDP59hk8B5SaKYME9E5npBVbZ6mg4BYAhJzEPcUkCYvcKkJOaaVsq+S6cT1nj2N3si3vLBs/80SLta0iPqGV0Fvpvs9BoghjaVFJfEVV4ckkIj7Bu1GKM19Tt5LejZcXhdLsVZubqR1xe+NLy Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: When a balloon page marked PageZeroed is freed during migration, use put_page_zeroed() to propagate the zeroed hint to the buddy allocator. Previously the hint was silently lost via plain put_page(). Signed-off-by: Michael S. Tsirkin Assisted-by: Claude:claude-opus-4-6 --- mm/balloon.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/mm/balloon.c b/mm/balloon.c index 96a8f1e20bc6..1bf7eb2642a9 100644 --- a/mm/balloon.c +++ b/mm/balloon.c @@ -324,7 +324,12 @@ static int balloon_page_migrate(struct page *newpage, struct page *page, balloon_page_finalize(page); spin_unlock_irqrestore(&balloon_pages_lock, flags); - put_page(page); + if (PageZeroed(page)) { + __ClearPageZeroed(page); + put_page_zeroed(page); + } else { + put_page(page); + } return 0; } -- MST