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From: Naoya Horiguchi To: "Matthew Wilcox (Oracle)" Cc: Andrew Morton , linux-mm@kvack.org, Naoya Horiguchi , Dan Williams , stable@vger.kernel.org Subject: Re: [PATCH 2/3] mm/memory-failure: Check the mapcount of the precise page Message-ID: <20231222012348.GA1572627@ik1-406-35019.vs.sakura.ne.jp> References: <20231218135837.3310403-1-willy@infradead.org> <20231218135837.3310403-3-willy@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20231218135837.3310403-3-willy@infradead.org> X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: B720B120009 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: 95bkhxzt19w5of9t3tzrsuwk4ieo8yh5 X-HE-Tag: 1703208238-782669 X-HE-Meta: U2FsdGVkX1+3j71vprf3+DldxxKJ1XL3UYVM774rL+B69XozwTL60i++Dtl+qbW2SrfjoMoBCO/fL0nPhkfoY+4Ol9XZt0wFvcagelQRn+RwJpyKAG8mHrSE03O6bQn3Q0auuXIXOm7pxqJ8Upx2hiI0Pv1NJNyh3wXQZcTu7dPOjgsUgsKzrzBIMBCBRL9wsZaePlLjShcoV+6fu7DfMoU0OmBxB/rZfaAb1yEiKTQrF+ByIAb7Xl2Dt4XPYJ/OR4eCSe2vRded2clEDLtbXmENgPcIZAvz0V3zqbBGsFveXnofgOHzfaLPciVC3wauwEPBf3uNk6Nfk26UtYOzC9LKigu36uYHIvrVFUbU0AWDUAKBI/VIZRubLyDxbWsGEsRWRjSJnzk4RYkoeD8G9pWRZjN6R8Ku7MsQqf4nkk1IYsBozt7AXOHV9wZsOtf0uzDJLuZeM9EWwNlZMdzbMoQdopUmXv8w4bLCq1kyHCGyz6PVId1lTkkO4Jc5Dxbb9DFE8hy9KHO3EDzJAAykxpaec82Zp83lPS3t6Qltwlmev2bgdBbmqcue72ejSE+EainVdqdcGkjOBvUZ7iTHi2yoZ/XV61XIw+6r/+dT6r2VqccjDorLILD242yKzLDV2rMfwnXc91KL3WrpbnQb50d1WnhqN5WZU5rK/vBSzLryjJA5y2CCHTGFHSosQEHSeEcM9D7XmvwinWhw5OXTcIB/yOdANjt1SV6lx+74CL5b/Vm3FCz7ayJB/gLD863N4tcUeE+S4fxFrk21CCOoAuKjQyXNyN69cqMLltr62zpUBLollo4Tjh5p+GCmuA2eUfm3Ni2WphtFT0Ghhwd+OechOHfG+X6RQCF/LeLzH0Ts8+PJWi+uPWZffqUX19tx20wq5nljS7MocTESRwozhlvR4UsK0g0y20Sv6LuD33VrkKTvqpb7rdxl0oGYAISEeaREzjyCApzl2XyXoqx I1xID7A/ bVHY10h5qltGQfSJXIC8UAHJIxni3c1gZ2ZcT0dfdN0/K/HXsBRJgA1lMIXyV7gJPscWJcykFUROiy2bca5SGXZ1GckE3LuMfuMT/u2E9dT340lCJwTGE29f7dnVKaIR1ys3Np2BHFlBVZJEG8R/LW5c7ymCwKm5dCNcipitMqalwpBji7nYK4BRPJ5EI+jk8Nrrs X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Dec 18, 2023 at 01:58:36PM +0000, Matthew Wilcox (Oracle) wrote: > A process may map only some of the pages in a folio, and might be missed > if it maps the poisoned page but not the head page. Or it might be > unnecessarily hit if it maps the head page, but not the poisoned page. > > Fixes: 7af446a841a2 ("HWPOISON, hugetlb: enable error handling path for hugepage") > Cc: stable@vger.kernel.org > Signed-off-by: Matthew Wilcox (Oracle) Acked-by: Naoya Horiguchi