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Received: from willy by casper.infradead.org with local (Exim 4.99.1 #2 (Red Hat Linux)) id 1wuTx8-00000003X9f-2ULy; Thu, 13 Aug 2026 11:50:30 +0000 Date: Thu, 13 Aug 2026 12:50:30 +0100 From: Matthew Wilcox To: "David Hildenbrand (Arm)" Cc: Andrew Morton , Jane Chu , linux-mm@kvack.org, Muchun Song , Oscar Salvador , Miaohe Lin , Naoya Horiguchi , Jan Kara , linux-fsdevel@vger.kernel.org, Christian Brauner , Jiaqi Yan , Sean Christopherson , Ackerley Tng , Gregory Price Subject: Re: [PATCH v9 05/15] guest_memfd: Use folio_has_hwpoisoned_page() Message-ID: References: <20260805210557.1118966-1-willy@infradead.org> <20260805210557.1118966-6-willy@infradead.org> <32873b50-c900-4fe5-9dc1-cb086bba77e7@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <32873b50-c900-4fe5-9dc1-cb086bba77e7@kernel.org> X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: CCD024000B X-Stat-Signature: setxsctmktejdt1swr4fageogi43q1q1 X-Rspam-User: X-HE-Tag: 1786621837-415101 X-HE-Meta: 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 WZgWzC4d 7hNjRCqXW+CtitOif5cytfToBExxOkwd6r02YKwsRDEzoOQYMtt09zRrN+S8FXQnab22YgBmaX14YW7svvXAVLNZI5uZUMX0yG8RMYMSPBVC1jxHd4JBtcKUXvA481r9ol4n6AG9SApkS6XSPS53FO6PbBMUd15ELwqes7lV6Ni7emwqPaU/0OGZlYZrL/WK68CcA7TGG087FOyWzFu53a7es1rdr+5oXw+qQIsuJfa+6ndUo4zaGsX5BhOxvFb0jPzkcCrRBjRhSjdnGzQcN1iJjyQ/ly3+TrrIwiQXTNX07WUu7xhLgmgrOD1CGwugVNMNcdzAlJLvBmYDPksu2tM7MkpoqWcV71OfPc+x3IgluiYE6crlbp/qsWxiLms1zAeQ5q3I7zNq49iCzmWqDPYDRFBWNLIfTIweZ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Aug 13, 2026 at 09:20:54AM +0200, David Hildenbrand (Arm) wrote: > On 8/5/26 23:05, Matthew Wilcox (Oracle) wrote: > > folio_test_hwpoison() only works on hugetlb folios today and will give > > the wrong answer for other large folios. folio_has_hwpoisoned_page() > > works on both. > > guest_memfd only uses small folios, so it doesn't really matter. Well ... virt/kvm/guest_memfd.c: /* TODO: Support huge pages. */ and one of the followup patches I have actually removes folio_test/set/clear_hwpoison() (it's a bit churny so I didn't want to include it as part of this series) > Acked-by: David Hildenbrand (Arm) Thanks!