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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jun 2025 15:16:20.0803 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b0547f3b-2176-46b9-f913-08dda69f6c28 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM3PEPF0000A79B.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU0PR08MB7946 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 48E0514000C X-Stat-Signature: sh84g99x951x7xupdm7oaz7r9ns7pknq X-Rspam-User: X-HE-Tag: 1749395789-862997 X-HE-Meta: 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 Me/ewOyc 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 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: Hi Harry, [...] > > You're not supposed allocate (even with GFP_ATOMIC) or free memory on > PREEMPT_RT in non-threaded interrupt context [1]. > > I think it somwhow implied in [2]? (Ok, probably not that obvious) > > "Acquiring a raw_spinlock_t disables preemption and possibly also > interrupts, so the critical section must avoid acquiring a regular > spinlock_t or rwlock_t, for example, the critical section must avoid > allocating memory." > > "But this code fails on PREEMPT_RT kernels because the memory allocator > is fully preemptible and therefore cannot be invoked from truly atomic > contexts." > > [1] https://lore.kernel.org/linux-mm/YwZSUpYY9l442Lxr@linutronix.de > > [2] https://www.kernel.org/doc/html/latest/locking/locktypes.html#raw-spi= nlock-t-on-rt > Thanks for clear reference :D I miss the clause of [2]... -- Sincerely, Yeoreum Yun IMPORTANT NOTICE: The contents of this email and any attachments are confid= ential and may also be privileged. If you are not the intended recipient, p= lease notify the sender immediately and do not disclose the contents to any= other person, use it for any purpose, or store or copy the information in = any medium. Thank you.