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Received: from willy by casper.infradead.org with local (Exim 4.99.1 #2 (Red Hat Linux)) id 1wsbRu-00000004kIM-15Cw; Sat, 08 Aug 2026 07:26:30 +0000 Date: Sat, 8 Aug 2026 08:26:30 +0100 From: Matthew Wilcox To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, dave.hansen@linux.intel.com, Liam.Howlett@oracle.com, ljs@kernel.org, david@kernel.org, shakeel.butt@linux.dev, vbabka@kernel.org, jannh@google.com, aliceryhl@google.com, arve@android.com, cmllamas@google.com, christian@brauner.io, tkjos@android.com, dsahern@kernel.org, davem@davemloft.net, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, syzbot@syzkaller.appspotmail.com Subject: Re: [PATCH v4 5/5] tcp: Remove mmap_lock fallback path Message-ID: References: <20260806200548.3124802-1-surenb@google.com> <20260806200548.3124802-6-surenb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260806200548.3124802-6-surenb@google.com> X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: DEF8240002 X-Stat-Signature: 1tbnrygqbk9xo6m7qg9kdb9qizz7cidh X-HE-Tag: 1786179815-413994 X-HE-Meta: U2FsdGVkX187o0PdYylC7LKR8pxp7BjQ/WIOmD23fYiwBf7qGKgBlQrkWy60vFlK3A4N2glFBN9k2nJD7cznlYb1RlHBUany5SmC7SPtBkv9FeqQztF1TbtXh9OFzILP9YZDg23T8D219+4cQCx2hvM/A8oKuaC+12sa7ZPbipUJZsXv5mvXY9Qg9z2We2A4eezI2S2iy/BJqFaOjs1F6MsWH1SfubCn4ZAsrH/3Q0soOTlmzz+IiliuzLBM8JNI7AX0OVjIoCX8G/6tx4KzcnwH5NsShB3Bv1APpMHCGvih9m33Qz5jI9DV0tgX8AAUOEQvSJH4EInrU3xu+4ccB9FZ/DhaRaAjebxgSa63Czpsct6JEj5coZrA3Z9t1und2g3zQVx3LC7LmfB9RApc6UxwMeWY0BDl0NTBE8Fjves5EidaL6mJm0sIf2CLdGFRsxQChHN3FrXfbiw1j5fWNWYRFHraUGXeDGprtbGJj4LGx9EkB6Y3lxI88xoY+029diYYlysEtpLYAquGPWiWgammKfNCwaQZ8U6pePROCClw0AfKqJVOfEecsdMNItHTexRm0M8/TPcjepLZryuGvRV8Bvo4Fixu4lCWx90MN0e+Lg6au/NR4jOkdYK5ETkN0BiXxFh0bSA6drYZrOTC/6YXeeZx4B3UZMTaJ76YiqCP3dxqFHHtFLU6Ipg0nGmRfHZ6BFubOBbRY+hD6BcNVoQFXiWfTJ4GqgTe9DCPhVJydJabVi1sRBwIRqdARKWOITM90EGavKu5ud3p8Ntf9PQZNQP6vzKyb5OWtDFCv+90Y4XvdhoER/xQwHr9s30e4uFuy/etZSSNnU4pLzF8kEoVvi1cSVz2FCoEyvlyqvfQCu0Ji6UiCGuvYA6+ZTMQZSp7Uh/I9Aqebi4B7x3bHS87L51ZuHWwcVldHOsbPX/U2Ywy0HvoI8kG/vZuKUMDOX1I/XRnrZf0g8oR3PN Xl5I8nrf IvBpkfz0PICNIsf1d3ETXAPkDhki2TL/ip0VFIO8qbtYV432gFOucue/VRqh0KVITmqDpXM3rSb1SvJ/TkEqewN/+FoH8lHP8Io0PNcUoDSADNU4z82LqwxwbloxJfgCkGAExOusr5VFxWBecQ2z3X3mFWb1Jh5LYxqS2mk5qJdQEV6ucuWz0GO9Ysd15WRkRBNiKYC7VleeclKlFqDtjE8gL5mIYjWmX9DwPqsXQjCa1ckwIg2HmTDxLjokp4lFKkmYchAjS+QZqAtCAm2w63ehVfa+WyWSkW2kLZzaTaeEvxM/HdSXzGPAE1LHxDj3qMtP6J0Fx/Fb70+hTBHIuyfj4+LmWOXqmUVB50DZAFqz6Am9RKBwPDoeUDA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Aug 06, 2026 at 01:05:48PM -0700, Suren Baghdasaryan wrote: > Previously, the per-VMA locking could fail in the face of writers > which necessitates a fallback to mmap_lock. The new > lock_vma_under_rcu_wait() will wait for writers instead of failing. It's not called that any more ...