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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Dec 2025 10:08:39.5598 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5428dcab-fe7c-40d2-5d9c-08de485491f7 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: AM3PEPF0000A78E.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR08MB5972 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251231_020848_948698_BD674D00 X-CRM114-Status: GOOD ( 14.05 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Gentle ping in case of forgotten. On Thu, Dec 18, 2025 at 07:47:48PM +0000, Yeoreum Yun wrote: > Under PREEMPT_RT, calling generic memory allocation/free APIs > (e.x) __get_free_pages(), pgtable_alloc(), free_pages() and etc > with preemption disabled is not allowed, but allow only nolock() APIs series > because it may acquire a spin lock that becomes sleepable on RT, > potentially causing a sleep during page allocation > (See Documentation/core-api/real-time/differences.rst, Memory allocation section). > > However, In arm64, __linear_map_split_to_ptes() and > __kpti_install_ng_mappings() called by stopper thread via stop_machine() > use generic memory allocation/free APIs. > > This patchset fixes this problem and based on v6.19-rc1 > > Patch History > ============== > from v2 to v3: > - remove split-mode and split_args. > pass proper function pointer while spliting. > - rename function name. > - https://lore.kernel.org/all/20251217182007.2345700-1-yeoreum.yun@arm.com/ > > from v1 to v2: > - drop pagetable_alloc_nolock() > - following @Ryan Roberts suggestion. > - https://lore.kernel.org/all/20251212161832.2067134-1-yeoreum.yun@arm.com/ > > > *** BLURB HERE *** > > Yeoreum Yun (2): > arm64: mmu: avoid allocating pages while splitting the linear mapping > arm64: mmu: avoid allocating pages while installing ng-mapping for > KPTI > > arch/arm64/mm/mmu.c | 254 ++++++++++++++++++++++++++++++++++---------- > 1 file changed, 197 insertions(+), 57 deletions(-) > > -- > LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7} > -- Sincerely, Yeoreum Yun