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b=nLQI89a2V5ZI3KSg9JZd/J/lYid7rrGeqdezDBgBTSzXvSAlSBciZ7LLTyVQK2q2e XEW/dXU0S/wLlplEyMAdQiN9qa751li2Fo5LV2FbPmIqN3tIjfP85bUW1mqrM4PlDC I5pt/yFYU/S9MtVBVld3gRpAxY2zPuz8towAG22k= Date: Fri, 24 Apr 2026 05:41:43 -0700 From: Andrew Morton To: "David Hildenbrand (Arm)" Cc: Greg Kroah-Hartman , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Jason Gunthorpe , John Hubbard , Peter Xu Subject: Re: [PATCH v2] mm/gup: honour FOLL_PIN in NOMMU __get_user_pages_locked() Message-Id: <20260424054143.087847e1617a84df8b501313@linux-foundation.org> In-Reply-To: References: <2026042303-vendor-outright-b9d2@gregkh> <2026042431-charter-ranging-597c@gregkh> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 0B81A140006 X-Rspamd-Server: rspam12 X-Stat-Signature: jxdbkmnoogtrkb6ibtqb7ebt6dnwxa86 X-Rspam-User: X-HE-Tag: 1777034504-390240 X-HE-Meta: U2FsdGVkX1+j4F52FGF1qTLpQS/ZQnMVbh6/EsdG8Px8iPahRvoZtm3XKvKazUmVbOOHts2GRuYwEL2FwOk+W0bbZjd0BwrKozN2SWUy/pu3mfQq7BRo9OVmruqzwRpFrneQVm+Nce3CqorjSYCDABob0VRJrKKVElj+VL3lgL729KnhJwNhh5YKbe0CserO9JummI6j3p5SLLY39mMgMFnBCg6JVWzX6kYAAEJ5Qz7me/fyByQIW8vAGF6yRC7zgXeKfHbdN20+ClJOgtl68jOxFeNabFIIpbuPe4O7Q6Co2LFeurOf+2wB2N/rW4/YLyz37ikw3wPnsLhxcvBrr2Y+F8SQ98zAlGPdrZHMBm9tnas6pYJ3uiJOKLuLUY6TmaaXRO75MFz2m1WFqA6BrKAZm/5kXFk97h8e0JIDiFi1otnjCVMlVhRWZ61w8efjQx0hOBy9wnYXdBRa18oxuDiSZ9nxYR5uTqYpq9eSA6e9oEfV6xrlQEAo52Qj+1TSVo/Hr/RBE/QGmYc30jWF5qqtuOtdfhRmAsXT3nRaGKBodd7hDeUgEewOz9zl6SOtWPFBtK1AbZOqBvTaJqcQUzczPmUouHE8WxtMHOottshfcxj/tNCUYEeZ3AWb4v8g2dpIrXqnsBeLIc6uoqCuLwPN9Fv6XISJKkLkE6rYYwKlFFsYLFcVMSphCCrv/GW3bKNIQzjeaXdDQkQKq68bOwkRhdgVLLZA1DTrmJo5iFrYoVnA9tdGt1AW9Saz/MHRHUisfmNYnfclCKBUAzNyq1EPm898jhC3OG9NQEGeizjP4s3YbwgQxc3x4zNepkeOXJPeTFnKJC0FROTNI7QWCBzfzb6Mltueg/o4Qs/Sy11LN8RLAlJgw01MBpLjde6TyZCw4qETkrcpKEhCCz2/fg3V5xyTZptWxxj4BsajEQ5hc8ocKXmbhCBy/FflYIwrJpmzXja38Iyo1nkaFr1 qTUQRIzJ 0Mie1dHyd2XiVHxSgoBMPLj5/8bKtQ3Ga4VUM7kKfQFdIS1llnmAsGjpcX1Gh5b25FfpQ1uhlePEd/LjDMcPp5n9APfeMST22LCa9Vt6cIjJMaA5gfnwhp3guY1XAIg/8ACA3NH/IAZQjYzak1yJqcbI8/UfA/0c9J3T4q+sRFBuI7NMU/cQWLTU6PirvHfnorZhLi2pE2ttvBCdYBUKmHMJZFQURbd/mJgg1aB4PSf7O2gYwqdfSIAH8WzWosUIFtTqoJ6onuWygXGjBehEDivQWjYU39dtWk7XBP3vE27g10rsLjlPEj4lNQ9Jyr22QxeVRwPzJDhjXJvR2jjTae5RdQv3CUt/m58fA56ZvZZoTHCPYxpuKgUpHvNyEVwMBcRb6UKbuLWObkMiOtuqLT23dkSeYPHIKG9NqRiTJXLSTLr8= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 24 Apr 2026 14:16:21 +0200 "David Hildenbrand (Arm)" wrote: > >>> Cc: David Hildenbrand > >>> Cc: Jason Gunthorpe > >>> Cc: John Hubbard > >>> Cc: Peter Xu > >>> Reported-by: Anthropic > >>> Assisted-by: gkh_clanker_t1000 > >> > >> Assisted-by: David :( > >> > >> (no, I'm not a tool! :) ) > > > > True, sorry, I guess people can "assist", I should have added that. > > > > If Andrew's tools automatically pick this up then: > > > > Assisted-by: David Hildenbrand > > I think we usually use Suggested-by:, but really I was just joking :) I thought you were gkh_clanker_t1000 > Andrew, can you add "While at it, don't return NULL pointers in the page array, > as this is really not expected for GUP users; instead, just fail and return > -EFAULT."? Thanks! Did.