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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id v26-20020a9d69da000000b0068bcd200247sm1240668oto.75.2023.02.09.13.50.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Feb 2023 13:50:38 -0800 (PST) Date: Thu, 9 Feb 2023 13:50:30 -0800 (PST) From: Hugh Dickins X-X-Sender: hugh@ripple.attlocal.net To: Andrew Morton cc: Hugh Dickins , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Yang Shi , Zach O'Keefe Subject: Re: [PATCH 1/2] mm/MADV_COLLAPSE: set EAGAIN on unexpected page refcount In-Reply-To: <20230209132846.122ad88e1c2bd0603a630e5c@linux-foundation.org> Message-ID: <1f344fc1-834d-f1df-8a2c-79918be5b22@google.com> References: <20230125015738.912924-1-zokeefe@google.com> <20230209132846.122ad88e1c2bd0603a630e5c@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Stat-Signature: cj7gq5p7wogsk5diubrhpqsnojzhnuyw X-Rspam-User: X-Rspamd-Queue-Id: 0606718001B X-Rspamd-Server: rspam06 X-HE-Tag: 1675979439-593692 X-HE-Meta: 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 PxZrOuDW Nf4YmLiEzLtdL/0s/AFY73Wd6BrbNjknkMvJVlk3cg+gBPr6BYi1D9lsg58cBfsSnsTWGPxMUwGSoOMMHQ+irQabiVDdCoyUko4bdbYLmFthXHBzsNQCuLZJZehxJ9ZfSjLkxrNBDEJsDftNro+KPhy8XrSitJCDrCol/87KNEupvpy7zL2w4F7vJMunWpia0hYU1M3SXXoWk287gP496Znsk9poAqsVF3sOlptvvXounGoiMO2A5TN1UP/1Kb4IkZlShgEJrVhTZc2QSEQLI5NmbWyn08AYVhAqCSt+bhziDpzWqs+FGr8VN1G7KxNzDcJIlr1hVku7rSBdR3WBI6kFC+lANGQEd7W26/Bi/lzi0zPNeisFy5Ymx3B7mMUjy2/R/91SM9BmlGy03dN777RltBKNKY2w7k+bEY+6GmDENMrk= 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: On Thu, 9 Feb 2023, Andrew Morton wrote: > > Thanks, I'll merge [1/2] into mm-hotfixes. Great, thanks. > > I'm not seeing anything in the [1/2] changelog which indicates that a > backport is needed. IOW, Correct: it's just changing the errno for some racy cases from "you're wrong, don't bother me again" to "it might be worth having another go": not fixing an instability, as 2/2 was. > > # cat .signature > When fixing a bug, please describe the end-user visible effects of that bug. If whatever's being run by the end-user is coded to try again on -EAGAIN, then the end-user will less often see occasional unexplained failures. Hugh