From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 9FF991A0B15; Thu, 28 May 2026 00:42:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779928948; cv=none; b=TEZdLIYt+44RBJGq5tQOu4XgfymJZrM6hGDqTSkwLqFqFbfeX8AVX8pAIkK8NITnlIFUwenaDVtBpxghkZfN9XECs0+2mbpAe5+nvrE8yGkMfCENTssPd5PzTlQLCEZa+D6eGdWGx9tlfe6bHcdCorblrPRG0QnSnWDdy0Z4Pxc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779928948; c=relaxed/simple; bh=g/amd3wyILjuFDEfmU6gXK+A7Dop+uIHBRXcymoLhAE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=I9vHAyADroLwmDuDNfeFFifSvvmo73Vv+lvDjWdXHcOF2z7mDKKQwALej2R0+o2pNbOZp+EXwWeteBgwiseyQ+6rXH43wC0ZSthByGdF2/bbKClf7qyI4K1YFaKj48w1Ta4ig34cJQh9CapVBEtqnuuaAdyhWmX8XfYdWChkU8Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=bp34lIni; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="bp34lIni" Received: by linux.microsoft.com (Postfix, from userid 1241) id 0F05620B7172; Wed, 27 May 2026 17:42:14 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 0F05620B7172 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1779928934; bh=J0h8gL8oeiYOkTla/NXs28W2cqoxPWC9xdMqpesgNs8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bp34lIniJvhoyH3OAvlDa8UBFuDbwE4WyLr0nUq53yto3zOxzO98Nh5+zW35NQyOi AWoc5aUOfSx0bpnjf9q/TWyi/sXx3cdKU9GEMor/ruRJ+UnKadXc8pz+Rwrek/nPDF 3LKQcLdzKcZQVEwFPsrztbrAmGTcKgX5+JVDG8SU= From: Jork Loeser To: linux-hyperv@vger.kernel.org, linux-mm@kvack.org, kexec@lists.infradead.org Cc: "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Mike Rapoport , Pasha Tatashin , Pratyush Yadav , Alexander Graf , Jason Miu , Andrew Morton , David Hildenbrand , Muchun Song , Oscar Salvador , Baoquan He , Catalin Marinas , Will Deacon , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Kees Cook , Ran Xiaokai , Justinien Bouron , Sourabh Jain , Pingfan Liu , "Rafael J. Wysocki" , Mario Limonciello , linux-arm-kernel@lists.infradead.org, x86@kernel.org, linux-kernel@vger.kernel.org, Michael Kelley , Jork Loeser Subject: [RFC PATCH 05/20] kho: add data argument to radix walk callback Date: Wed, 27 May 2026 17:41:47 -0700 Message-ID: <20260528004204.1484584-6-jloeser@linux.microsoft.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: <20260528004204.1484584-1-jloeser@linux.microsoft.com> References: <20260528004204.1484584-1-jloeser@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: "Pratyush Yadav (Google)" Add an opaque data pointer argument to kho_radix_walk_cb_t. This can be used for callers to pass extra information to the callback. Signed-off-by: Pratyush Yadav (Google) Signed-off-by: Jork Loeser --- include/linux/kho_radix_tree.h | 8 ++++---- kernel/liveupdate/kexec_handover.c | 24 +++++++++++++----------- 2 files changed, 17 insertions(+), 15 deletions(-) diff --git a/include/linux/kho_radix_tree.h b/include/linux/kho_radix_tree.h index fe7151d89361..6c0f7d82716b 100644 --- a/include/linux/kho_radix_tree.h +++ b/include/linux/kho_radix_tree.h @@ -44,8 +44,8 @@ struct kho_radix_tree { * return value is directly returned to the caller. */ struct kho_radix_walk_cb { - int (*key)(unsigned long key); - int (*table)(phys_addr_t phys); + int (*key)(unsigned long key, void *data); + int (*table)(phys_addr_t phys, void *data); }; #ifdef CONFIG_KEXEC_HANDOVER @@ -53,7 +53,7 @@ struct kho_radix_walk_cb { int kho_radix_add_key(struct kho_radix_tree *tree, unsigned long key); void kho_radix_del_key(struct kho_radix_tree *tree, unsigned long key); int kho_radix_walk_tree(struct kho_radix_tree *tree, - const struct kho_radix_walk_cb *cb); + const struct kho_radix_walk_cb *cb, void *data); #else /* #ifdef CONFIG_KEXEC_HANDOVER */ @@ -66,7 +66,7 @@ static inline void kho_radix_del_key(struct kho_radix_tree *tree, unsigned long key) { } static inline int kho_radix_walk_tree(struct kho_radix_tree *tree, - const struct kho_radix_walk_cb *cb) + const struct kho_radix_walk_cb *cb, void *data) { return -EOPNOTSUPP; } diff --git a/kernel/liveupdate/kexec_handover.c b/kernel/liveupdate/kexec_handover.c index 0f8d058f1a27..f6de6bf63226 100644 --- a/kernel/liveupdate/kexec_handover.c +++ b/kernel/liveupdate/kexec_handover.c @@ -267,14 +267,14 @@ void kho_radix_del_key(struct kho_radix_tree *tree, unsigned long key) EXPORT_SYMBOL_GPL(kho_radix_del_key); static int kho_radix_walk_leaf(struct kho_radix_leaf *leaf, unsigned long key, - const struct kho_radix_walk_cb *cb) + const struct kho_radix_walk_cb *cb, void *data) { unsigned long *bitmap = (unsigned long *)leaf; unsigned int i; int err; if (cb->table) { - err = cb->table(virt_to_phys(leaf)); + err = cb->table(virt_to_phys(leaf), data); if (err) return err; } @@ -283,7 +283,7 @@ static int kho_radix_walk_leaf(struct kho_radix_leaf *leaf, unsigned long key, return 0; for_each_set_bit(i, bitmap, PAGE_SIZE * BITS_PER_BYTE) { - err = cb->key(key | i); + err = cb->key(key | i, data); if (err) return err; } @@ -293,7 +293,7 @@ static int kho_radix_walk_leaf(struct kho_radix_leaf *leaf, unsigned long key, static int __kho_radix_walk_tree(struct kho_radix_node *root, unsigned int level, unsigned long start, - const struct kho_radix_walk_cb *cb) + const struct kho_radix_walk_cb *cb, void *data) { struct kho_radix_node *node; struct kho_radix_leaf *leaf; @@ -302,7 +302,7 @@ static int __kho_radix_walk_tree(struct kho_radix_node *root, int err; if (cb->table) { - err = cb->table(virt_to_phys(root)); + err = cb->table(virt_to_phys(root), data); if (err) return err; } @@ -323,10 +323,10 @@ static int __kho_radix_walk_tree(struct kho_radix_node *root, * node is pointing to the level 0 bitmap. */ leaf = (struct kho_radix_leaf *)node; - err = kho_radix_walk_leaf(leaf, key, cb); + err = kho_radix_walk_leaf(leaf, key, cb, data); } else { err = __kho_radix_walk_tree(node, level - 1, - key, cb); + key, cb, data); } if (err) @@ -340,6 +340,7 @@ static int __kho_radix_walk_tree(struct kho_radix_node *root, * kho_radix_walk_tree - Traverses the radix tree and calls a callback for each key. * @tree: A pointer to the KHO radix tree to walk. * @cb: Set of callbacks to be invoked during the tree walk. + * @data: Opaque data pointer passed to each callback in @cb. * * This function walks the radix tree, searching from the top level down to the * lowest level (level 0), invoking the appropriate callbacks. @@ -348,14 +349,15 @@ static int __kho_radix_walk_tree(struct kho_radix_node *root, * value from the callback that stopped the walk. */ int kho_radix_walk_tree(struct kho_radix_tree *tree, - const struct kho_radix_walk_cb *cb) + const struct kho_radix_walk_cb *cb, void *data) { if (WARN_ON_ONCE(!tree->root)) return -EINVAL; guard(mutex)(&tree->lock); - return __kho_radix_walk_tree(tree->root, KHO_TREE_MAX_DEPTH - 1, 0, cb); + return __kho_radix_walk_tree(tree->root, KHO_TREE_MAX_DEPTH - 1, 0, cb, + data); } EXPORT_SYMBOL_GPL(kho_radix_walk_tree); @@ -486,7 +488,7 @@ static struct page *__init kho_get_preserved_page(phys_addr_t phys, return pfn_to_page(pfn); } -static int __init kho_preserved_memory_reserve(unsigned long key) +static int __init kho_preserved_memory_reserve(unsigned long key, void *data) { union kho_page_info info; struct page *page; @@ -1414,7 +1416,7 @@ static int __init kho_mem_retrieve(const void *fdt) kho_in.radix_tree.root = phys_to_virt(kho_get_mem_map_phys(fdt)); mutex_init(&kho_in.radix_tree.lock); - return kho_radix_walk_tree(&kho_in.radix_tree, &cb); + return kho_radix_walk_tree(&kho_in.radix_tree, &cb, NULL); } static __init int kho_out_fdt_setup(void) -- 2.43.0