From nobody Wed Oct 1 22:30:43 2025 Received: from mail-pg1-f201.google.com (mail-pg1-f201.google.com [209.85.215.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 72E3923E32D for ; Wed, 1 Oct 2025 01:19:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759281593; cv=none; b=SX8rZ3PrD5uyb1eLwfCpvZ90Fz24BYKpmSiG/9vYhCpDEwdeIvzhTdZNIj089IPpAr8fLdLssOMQheOOiWZof9DEDL027BJXBlLu6UEvFg5RS4hQYeFuX0W6KU5bhcpywD8YVOFt/UESgO6poKLz3XPs478xLF3J0I5yyJFw08U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759281593; c=relaxed/simple; bh=eyhAqvClZGxGAi9GqsE4GIrUwtn7ku8Q5iIwLCXU1qA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Content-Type; b=LxRdbH+gu/r1hOG7hPU60TIB7NLj9fB+mW9KbYSFuxImwC2rhG0cIljL7AC+PXxEz5ItXitq5DEtMA1dASvE6ctlPq6ABSmbBaF60JqlSQsdDySOAfta/ISXuk7fFwHovb20p3WLZ13RIMdigJW3h7g7Bv2nwEacyUJO9JqE3hQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jasonmiu.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=UYkd7BTC; arc=none smtp.client-ip=209.85.215.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jasonmiu.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="UYkd7BTC" Received: by mail-pg1-f201.google.com with SMTP id 41be03b00d2f7-b5a013bc46dso3060687a12.1 for ; Tue, 30 Sep 2025 18:19:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1759281592; x=1759886392; darn=vger.kernel.org; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :from:to:cc:subject:date:message-id:reply-to; bh=x4HnKiiE09rl43LC3UECv7NDLXowg9VsBNh2ns+1RXE=; b=UYkd7BTC/AQ7MYOEdsmZFWTed/etj2OPxazuEjG8L1XWV7Kr4BJH1wB4JQVFdcU83n 243fKjRxHK/00/+WzvOTditg7x2VGd2AcrRpxFMIP2Y+SP85XetCZtbp/ou/ouvUuIJ8 EG5E25yceLv0tbsDGt62jXPPw+bW9ZzWhanAI4++Wr1mmDAX/xAU4vCVfZxZGJBlkjgM D08jJP9FZjzHhAF/EgTAcI78qnuvkQMvl9grLLf588ufCewoxBIwzEYDisj/wT7Sxfw7 x22cEg8qXG9jq1GFvuUU7Aep3E9aixnBq4FXq443RgCXbK45OsMYJMlMHQ1ieWz9PVKH A+UA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759281592; x=1759886392; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=x4HnKiiE09rl43LC3UECv7NDLXowg9VsBNh2ns+1RXE=; b=dFNKiZdM5dg1SCInnouNzgl+FBABtMpBciSZXSskmbJnOYm87FiUTzXgySbKEJ+1t0 zCidkKB6HSzLEtSlp1E5qyQK6HWZkanEpJwUJLoPNDjbtUDzy3GdRhHcjhNKR3qcvYyD ebhgwnblx/lmtHUH8RPfW66opOgXbzMNCtg/2UxYty7+P4xq2L28EORMLxdAQPAEejjh zg6liMbJp/NZc7ZiRcSMSwtiE4FUEWrjvkfHSom3SMJRlAdLf3oQmMfnjtltZij0EDVL YywQskAwcOtqcgKecqnxjvuu4M+BCp0hXnQtAvkN8+YyrDLzg77Y88/tqE69bWOhKLb9 XIZA== X-Forwarded-Encrypted: i=1; AJvYcCURZZe1RTCXTgV4vK9mGMFAxllYXaawiiWN9fo7xsfItC0y11LYEJgh4udnAYydXYP2UFJkot8uU/dzRZs=@vger.kernel.org X-Gm-Message-State: AOJu0Yyu1tiOY07vvLeyBVQM/fzizNvzi+u2HqJW80FkdKThPRuPFcYo KIDMpYrrEE2OjnE7YMvuIYL+dG2aVejPxgEZH4DE5r6SwP76gHOA5ymakz6InQyDKMxwUvakZBc bwh4ZABzzFR9FnA== 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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; }; =20 -/* KHO Notifier index */ -enum kho_event { - KEXEC_KHO_FINALIZE =3D 0, - KEXEC_KHO_ABORT =3D 1, -}; - struct folio; -struct notifier_block; - -struct kho_serialization; =20 #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); =20 -int register_kho_notifier(struct notifier_block *nb); -int unregister_kho_notifier(struct notifier_block *nb); - void kho_memory_init(void); =20 void kho_populate(phys_addr_t fdt_phys, u64 fdt_len, phys_addr_t scratch_p= hys, @@ -68,16 +56,6 @@ static inline int kho_retrieve_subtree(const char *name,= phys_addr_t *phys) return -EOPNOTSUPP; } =20 -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 =20 @@ -641,13 +640,11 @@ static int kho_debugfs_fdt_add(struct list_head *list= , struct dentry *dir, } =20 struct kho_out { - struct blocking_notifier_head chain_head; struct dentry *dir; struct kho_serialization ser; }; =20 static struct kho_out kho_out =3D { - .chain_head =3D BLOCKING_NOTIFIER_INIT(kho_out.chain_head), .ser =3D { .fdt_list =3D 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); =20 -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. --=20 2.51.0.618.g983fd99d29-goog