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b=ODsAOL0pgxUcMd5xFDQnqVBGul 1txeQZrUZMLqGYQAxnqez8tYY0tANsGNWfSxQi2AgSBLa9ou9N1swildx7fWjPDZrsYrVz5WxNQfX SVza4ZDTyDpyaOos8uQ3e2deSVPjr1TDi+M03qexXYV5LQDo/yQw/exVaMBSADObuuC9ZgFvmQPta J7+1kI7Ntc9525z0MSCIXUbiR9ykmLzrpUIExeRGNNLOgAogK1omJWwxN6wkP79+QVG2R6bkLdqzm Woo8HOByXNeQxTyuqu5CZNg8y9U9kDlDn4D60JLMx7Uslawp+8Cpyr3nKT4bqdoFr379wq2o27LD/ ZD+FMdWA==; Received: from viro by zeniv.linux.org.uk with local (Exim 4.99 #2 (Red Hat Linux)) id 1vPo6N-0000000F4H1-0jjX; Sun, 30 Nov 2025 20:32:59 +0000 Date: Sun, 30 Nov 2025 20:32:59 +0000 From: Al Viro To: david laight Cc: Linus Torvalds , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-alpha@vger.kernel.org Subject: Re: [RFC][alpha] saner vmalloc handling (was Re: [Bug report] hash_name() may cross page boundary and trigger sleep in RCU context) Message-ID: <20251130203259.GX3538@ZenIV> References: <20251126090505.3057219-1-wozizhi@huaweicloud.com> <20251126185545.GC3538@ZenIV> <20251129033728.GH3538@ZenIV> <20251130030146.GN3538@ZenIV> <20251130113213.40c8e7a0@pumpkin> <20251130164348.GV3538@ZenIV> <20251130190331.40385ddc@pumpkin> <20251130203118.GW3538@ZenIV> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251130203118.GW3538@ZenIV> X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 1C6E080010 X-Stat-Signature: rro7ee8ydhuqx31k4ugt6nsrxu143xpb X-Rspam-User: X-HE-Tag: 1764534768-983237 X-HE-Meta: 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 yMk6WaUg YgrcqF+NHF6hbikeNoMhM1toBU4JzQmlpbk7ylnBxk32tRjlRTwro7ygwULl5MoxYn9XQD0cRLUqCUvT4KvYqOk6XDTjwCGO7kU/9AFzr8KPk9b2EE+TF8b85vrEXFsMHzkcW1mTSNphdHtMzIG0Drubbk2cIVx+DJR1t5vCwX8QqK+Rp8kC9ByjmDTE4kEy7PxleNSErauEgS3m49g/Vp0479WvmIojZR4gyS7SBmw5vYkTe7W2O/r714KgBBOLR2Iu8Ohjzcud5/GS6k1UShifuUf9YrZTHra0wgwyk1P0swrd935D9p0LfoCpFM3NiBnyGpOiLekpyj6nyp6hVn/Wwn1q2zwBG4cov2eZV6IrUctiM37xmUebKM6o4UmndHIZRU2VkT5XPMXFChTrDWmePZvM0CdUA94nTx/BbZKcp3Gge5ngxVrAealbxPL3FUZdf+ks9cJki81DYo4x7ABd77ywlanx1C+ga0P25EqXfgS0= 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: On Sun, Nov 30, 2025 at 08:31:18PM +0000, Al Viro wrote: > It certainly can happen on x86 - two vmalloc(SZ_4M) in parallel 32bit x86, that is. > will do just that, but with NUMA you can get it 64bit boxen > as well.