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AJvYcCUvhBAorW1m0NGuhWc+EQKlvVzU4ONqqQC1lUAR6+haUDAZS4UD54FudPGsxWkqmjzK5jVxMG3qfw==@kvack.org X-Gm-Message-State: AOJu0Ywv45brV/G/dILkmBOInxxiKmQzkBnDi1cSfWXJEl7EqPtjAruk bDNKEal9uQbd8iOIBBCfzFDmtrbyX+eKfI9V3jvjWgRKRfWK1ku57r5h23IFcuq1TZCTwx3BdxB Td99wOpW5Yrf/Ag== X-Google-Smtp-Source: AGHT+IEBtmTt/de8ZAH/Gty67fG7K6wz+DH/TLooGqCBdKidWKsNfouEipgjC7MTQ3Jd+/633JnpD2gkYNbqjw== X-Received: from plbml5.prod.google.com ([2002:a17:903:34c5:b0:24b:1657:c088]) (user=jasonmiu job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:f642:b0:266:ddd:772f with SMTP id d9443c01a7336-28e7f276df7mr19249665ad.9.1759281591707; Tue, 30 Sep 2025 18:19:51 -0700 (PDT) Date: Tue, 30 Sep 2025 18:19:41 -0700 In-Reply-To: <20251001011941.1513050-1-jasonmiu@google.com> Mime-Version: 1.0 References: <20251001011941.1513050-1-jasonmiu@google.com> X-Mailer: git-send-email 2.51.0.618.g983fd99d29-goog Message-ID: <20251001011941.1513050-4-jasonmiu@google.com> Subject: [PATCH v1 3/3] kho: Remove notifier system infrastructure From: Jason Miu To: Alexander Graf , Andrew Morton , Baoquan He , Changyuan Lyu , David Matlack , David Rientjes , Jason Gunthorpe , Jason Miu , Mike Rapoport , Pasha Tatashin , Pratyush Yadav , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: D91BB40004 X-Stat-Signature: y3ge1e818gnaajpe486fefezidf65qog X-HE-Tag: 1759281592-759808 X-HE-Meta: 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 rB9NSiLs 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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: Eliminate the core KHO notifier API functions (`register_kho_notifier`, `unregister_kho_notifier`), the `kho_event` enum, and the notifier chain head from KHO internal structures. This infrastructure was used to support the now-removed finalize and abort states and is no longer required. Client subsystems now interact with KHO through direct API calls. Signed-off-by: Jason Miu --- include/linux/kexec_handover.h | 22 ---------------------- kernel/kexec_handover.c | 15 --------------- 2 files changed, 37 deletions(-) diff --git a/include/linux/kexec_handover.h b/include/linux/kexec_handover.h index 9566c90a3501..09e8f0b0fcab 100644 --- a/include/linux/kexec_handover.h +++ b/include/linux/kexec_handover.h @@ -10,16 +10,7 @@ struct kho_scratch { phys_addr_t size; }; -/* KHO Notifier index */ -enum kho_event { - KEXEC_KHO_FINALIZE = 0, - KEXEC_KHO_ABORT = 1, -}; - struct folio; -struct notifier_block; - -struct kho_serialization; #ifdef CONFIG_KEXEC_HANDOVER bool kho_is_enabled(void); @@ -30,9 +21,6 @@ struct folio *kho_restore_folio(phys_addr_t phys); int kho_add_subtree(const char *name, void *fdt); int kho_retrieve_subtree(const char *name, phys_addr_t *phys); -int register_kho_notifier(struct notifier_block *nb); -int unregister_kho_notifier(struct notifier_block *nb); - void kho_memory_init(void); void kho_populate(phys_addr_t fdt_phys, u64 fdt_len, phys_addr_t scratch_phys, @@ -68,16 +56,6 @@ static inline int kho_retrieve_subtree(const char *name, phys_addr_t *phys) return -EOPNOTSUPP; } -static inline int register_kho_notifier(struct notifier_block *nb) -{ - return -EOPNOTSUPP; -} - -static inline int unregister_kho_notifier(struct notifier_block *nb) -{ - return -EOPNOTSUPP; -} - static inline void kho_memory_init(void) { } diff --git a/kernel/kexec_handover.c b/kernel/kexec_handover.c index ee4f430dfae0..fc290226e58b 100644 --- a/kernel/kexec_handover.c +++ b/kernel/kexec_handover.c @@ -16,7 +16,6 @@ #include #include #include -#include #include #include @@ -641,13 +640,11 @@ static int kho_debugfs_fdt_add(struct list_head *list, struct dentry *dir, } struct kho_out { - struct blocking_notifier_head chain_head; struct dentry *dir; struct kho_serialization ser; }; static struct kho_out kho_out = { - .chain_head = BLOCKING_NOTIFIER_INIT(kho_out.chain_head), .ser = { .fdt_list = LIST_HEAD_INIT(kho_out.ser.fdt_list), }, @@ -697,18 +694,6 @@ int kho_add_subtree(const char *name, void *fdt) } EXPORT_SYMBOL_GPL(kho_add_subtree); -int register_kho_notifier(struct notifier_block *nb) -{ - return blocking_notifier_chain_register(&kho_out.chain_head, nb); -} -EXPORT_SYMBOL_GPL(register_kho_notifier); - -int unregister_kho_notifier(struct notifier_block *nb) -{ - return blocking_notifier_chain_unregister(&kho_out.chain_head, nb); -} -EXPORT_SYMBOL_GPL(unregister_kho_notifier); - /** * kho_preserve_folio - preserve a folio across kexec. * @folio: folio to preserve. -- 2.51.0.618.g983fd99d29-goog