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[173.79.56.208]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7c7a8943afcsm321264485a.16.2025.04.11.15.11.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Apr 2025 15:11:29 -0700 (PDT) From: Gregory Price To: linux-mm@kvack.org Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, donettom@linux.ibm.com Subject: [RFC PATCH v4 1/6] migrate: Allow migrate_misplaced_folio_prepare() to accept a NULL VMA. Date: Fri, 11 Apr 2025 18:11:06 -0400 Message-ID: <20250411221111.493193-2-gourry@gourry.net> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250411221111.493193-1-gourry@gourry.net> References: <20250411221111.493193-1-gourry@gourry.net> MIME-Version: 1.0 X-Rspamd-Server: rspam01 X-Stat-Signature: 97yzpenfhbjcgcosyipuugduw4h7ggf5 X-Rspam-User: X-Rspamd-Queue-Id: 40EE04000B X-HE-Tag: 1744409491-980541 X-HE-Meta: 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 pnUbLPGe 2myxbj3u6R8ZaFtpn6pcCJxvlsXBjaxyJlaJeJO6808EgF/taUxIqFazzD/nBhM7NfLETMLzlEGXnZuCquev4XIINeQE3TmNLZufrrkQPwVIYQQ1lePZHy4j+whwZkBZlDMVKGfDiQMWOy/aEOC1NxEdDR2UoHsEIPu5fwdlOKD2oaTTWK/6uPRndjqVEe0zBVsr4V8wT0scP8desiHLtH1N1zfiLtyrwhWYv7Nj5aSthrPWfuNttgqaUElxoRsZ2ilEc5MjEdAQgleArKuAsCkbHYKY0ZXKzaX6KmYblLMckg8EWozIa97rvzZb/b6RRtylqmuMIWeIaeZpVHfq7Sfs9n/Ptj6PtkMrfZScnnwd1LzYLh9SGZC7z6ggWNJjmwuJc6x60/eaLFTnQrbIuPM5a2u/OznyKL8rC 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: migrate_misplaced_folio_prepare() may be called on a folio without a VMA, and so it must be made to accept a NULL VMA. Suggested-by: Johannes Weiner Signed-off-by: Gregory Price --- mm/migrate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/migrate.c b/mm/migrate.c index f3ee6d8d5e2e..047131f6c839 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2654,7 +2654,7 @@ int migrate_misplaced_folio_prepare(struct folio *folio, * See folio_maybe_mapped_shared() on possible imprecision * when we cannot easily detect if a folio is shared. */ - if ((vma->vm_flags & VM_EXEC) && folio_maybe_mapped_shared(folio)) + if (vma && (vma->vm_flags & VM_EXEC) && folio_maybe_mapped_shared(folio)) return -EACCES; /*