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AJvYcCUOso8EHc4omNy5Z/wrIWa7+680ncPgs7LgcS2XB+dNaDMNg/sWHjjQrFfuhxHYX6Tygb8XOgxVjw==@kvack.org X-Gm-Message-State: AOJu0Ywx2SWcJijk7eJamNJXvGL2pmSdn6NtVkP6H19J4WVbn0Lzfp50 KqLyck/xZrMyD8wN5VD7EnfpOO9q6hI9X9refYZPd/e2vhUADCBaB9aH9yQeml15E/XuR+Tfc/+ PGy7mP9goODJENVDYx3Tbz+YdoPU= X-Gm-Gg: ASbGnctjb1gLepZxzKRAUGIXstxwfoqWOSoSxagjVKE3DmQcXOXXaBeqhQ6vhYVqO9C lqqmjTkfJP3MxudR9MFTYyk6jF+gtu+0VojSKvaY3ozlj4Vcc/8K8aTEpotpOjEFaxa/zyw== X-Google-Smtp-Source: AGHT+IGs+Y+BUs0MQtiMUaIeawQKnEBmP6PDBF8YV7tbwjALbtoMERVaMJxi2wQMR7vT9cd2Nsa8lQh3BBnLRvetE1k= X-Received: by 2002:a05:6000:785:b0:386:3327:4f21 with SMTP id ffacd0b85a97d-388c3a8f4a9mr2956297f8f.27.1734116283629; Fri, 13 Dec 2024 10:58:03 -0800 (PST) MIME-Version: 1.0 References: <20241210023936.46871-1-alexei.starovoitov@gmail.com> <20241210023936.46871-2-alexei.starovoitov@gmail.com> <20241212150744.dVyycFUJ@linutronix.de> <20241212153506.dT1MvukO@linutronix.de> <20241212104809.1c6cb0a1@batman.local.home> <20241212160009.O3lGzN95@linutronix.de> <20241213124411.105d0f33@gandalf.local.home> In-Reply-To: From: Alexei Starovoitov Date: Fri, 13 Dec 2024 10:57:52 -0800 Message-ID: Subject: Re: [PATCH bpf-next v2 1/6] mm, bpf: Introduce __GFP_TRYLOCK for opportunistic page allocation To: Steven Rostedt Cc: Sebastian Sewior , Michal Hocko , Matthew Wilcox , bpf , Andrii Nakryiko , Kumar Kartikeya Dwivedi , Andrew Morton , Peter Zijlstra , Vlastimil Babka , Hou Tao , Johannes Weiner , shakeel.butt@linux.dev, Thomas Gleixner , Tejun Heo , linux-mm , Kernel Team Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 2C57A140020 X-Stat-Signature: ekxhh76uk8jjcdqxb67pnjk5q1bhxqsr X-Rspam-User: X-HE-Tag: 1734116267-579363 X-HE-Meta: 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 RVnxKzgf Px3z0Xulvvt4/iGQditQYnhbeQAyiy6brPg0IUFwChrSe8CDnLlZCP/VwYEU1dX/S5W/O+2nMI4iU90M3uIJFa+mY6qfPH4sEbGDCpX1ggeD6H884jMGkkfs6+lNT6ob24aCqjU1CMv6L6mrygHpEJRlf9hw8GMtkxTSwOyYYqPJ2Dy+rVRFVucJrLl7w5J1xASmTOhYmLvEn6rrwy9p5oU9xkLo9iCJYRoVMTGdQfM9yaxvVtuVuiuZ/ScacDmQw9zdZPztkURedYTGhV3SpeNYCPhQwIYdpMzEXf7cOW/Cg2+KHrUqLIQdBPENEo8wxcmictoR6dxlCT6P1hIH3YFCbh9Fe3/3hkPYi3nCY7F5NTzgkclRvZb+nj5Fx//xsecWcc/T5ru0Kwe1iUkGmwAwLngj5j9omuGLpbi0O/IQOlT9t/WLjpgQZTRPpWtZawyDJ X-Bogosity: Ham, tests=bogofilter, spamicity=0.079764, 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 Fri, Dec 13, 2024 at 10:44=E2=80=AFAM Alexei Starovoitov wrote: > > If hard-irq acquired rt_mutex B (spin_lock or spin_trylock doesn't > change the above analysis), attempting to spin_lock from irq is obviously not safe. scratch that part.