From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0019B35CBC4 for ; Mon, 9 Mar 2026 07:58:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773043091; cv=none; b=D3/Vxle4YhFAJwkcYskrnDd630tMFIF1rZckYDMutGF47xr/o89eK+rSkDRn5T+9Cu2q2DLMFbxKcHhdDVbGPajVgUBAkpKTDBLmGFIyeE2lJl1mxWE75qUFFUlQgWDy1m5bFCvimhU0eLCGPufs3QJXVhM3ZkLw/rMJ+YAZ1bc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773043091; c=relaxed/simple; bh=hUC6isBD58pUbu3zVQBoLKKC8yyRHkrLeQRdXS+SnP0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=sX6IQmvUdJ4pBoFlHN2o99aP2gH89kBPXPn9oGwDYni+Cs2/LqggcCCil1y84j1oRT+S2lxuC8s7543dsrbx0qrdi3WAQlbidf3D4vPffN8rlMlLN7xjWM6QFBbrQPljEqcVa1Oqa4nzq9C+v7DaMgAH0FzfJTrcuL/M9MNiSS4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=sClTN7LR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="sClTN7LR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EC603C4CEF7; Mon, 9 Mar 2026 07:58:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773043090; bh=hUC6isBD58pUbu3zVQBoLKKC8yyRHkrLeQRdXS+SnP0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=sClTN7LRV3iwwY9qz66NghmzMC8SpFSJbToxuVy4BVF5uIomByFWf3jOe0N052pJb uGYnS+e2Nl7h6qc/xPnGiuWuT6Lx2UqprA0i4ePdVTT0EqQKE/XFW4qBzKuwGFG/PR EMIjY7nVuZ+omD39r4Fcjg796/5SL6xhmpQxmrNDwi71hiDNxioYYIcNHhzvwRLIkP GQgPKYtajX8JfO3HNU2AdGOb1aV6pNNz0z/7ASY1/kllgQEU/XBIqqsedf7Tux28uE LwbmzHcnOak0ZNfG+o/1MA//Vl9PJZZzXyauDhQHAqkLr884ErpdVNyyU4yxM/XU9N XHRftrpNAG3nQ== Date: Mon, 9 Mar 2026 09:58:02 +0200 From: Mike Rapoport To: Breno Leitao Cc: Alexander Graf , Pasha Tatashin , Pratyush Yadav , linux-kernel@vger.kernel.org, kexec@lists.infradead.org, linux-mm@kvack.org, usamaarif642@gmail.com, SeongJae Park , kernel-team@meta.com Subject: Re: [PATCH v7 2/6] kho: rename fdt parameter to blob in kho_add/remove_subtree() Message-ID: References: <20260306-kho-v7-0-404d14c188bb@debian.org> <20260306-kho-v7-2-404d14c188bb@debian.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260306-kho-v7-2-404d14c188bb@debian.org> On Fri, Mar 06, 2026 at 04:39:21AM -0800, Breno Leitao wrote: > Since kho_add_subtree() now accepts arbitrary data blobs (not just > FDTs), rename the parameter from 'fdt' to 'blob' to better reflect > its purpose. Apply the same rename to kho_remove_subtree() for > consistency. > > Also rename kho_debugfs_fdt_add() and kho_debugfs_fdt_remove() to > kho_debugfs_blob_add() and kho_debugfs_blob_remove() respectively, > with the same parameter rename from 'fdt' to 'blob'. > > Signed-off-by: Breno Leitao Reviewed-by: Mike Rapoport (Microsoft) > --- > include/linux/kexec_handover.h | 8 ++++---- > kernel/liveupdate/kexec_handover.c | 25 +++++++++++++------------ > kernel/liveupdate/kexec_handover_debugfs.c | 25 +++++++++++++------------ > kernel/liveupdate/kexec_handover_internal.h | 16 ++++++++-------- > 4 files changed, 38 insertions(+), 36 deletions(-) > > diff --git a/include/linux/kexec_handover.h b/include/linux/kexec_handover.h > index abb1d324f42d0..0666cf298c7f4 100644 > --- a/include/linux/kexec_handover.h > +++ b/include/linux/kexec_handover.h > @@ -32,8 +32,8 @@ void kho_restore_free(void *mem); > struct folio *kho_restore_folio(phys_addr_t phys); > struct page *kho_restore_pages(phys_addr_t phys, unsigned long nr_pages); > void *kho_restore_vmalloc(const struct kho_vmalloc *preservation); > -int kho_add_subtree(const char *name, void *fdt, size_t size); > -void kho_remove_subtree(void *fdt); > +int kho_add_subtree(const char *name, void *blob, size_t size); > +void kho_remove_subtree(void *blob); > int kho_retrieve_subtree(const char *name, phys_addr_t *phys); > > void kho_memory_init(void); > @@ -97,12 +97,12 @@ static inline void *kho_restore_vmalloc(const struct kho_vmalloc *preservation) > return NULL; > } > > -static inline int kho_add_subtree(const char *name, void *fdt, size_t size) > +static inline int kho_add_subtree(const char *name, void *blob, size_t size) > { > return -EOPNOTSUPP; > } > > -static inline void kho_remove_subtree(void *fdt) { } > +static inline void kho_remove_subtree(void *blob) { } > > static inline int kho_retrieve_subtree(const char *name, phys_addr_t *phys) > { > diff --git a/kernel/liveupdate/kexec_handover.c b/kernel/liveupdate/kexec_handover.c > index 55bdc5d2d1929..ebaf3104c36ab 100644 > --- a/kernel/liveupdate/kexec_handover.c > +++ b/kernel/liveupdate/kexec_handover.c > @@ -749,13 +749,13 @@ static void __init kho_reserve_scratch(void) > } > > /** > - * kho_add_subtree - record the physical address of a sub FDT in KHO root tree. > + * kho_add_subtree - record the physical address of a sub blob in KHO root tree. > * @name: name of the sub tree. > - * @fdt: the sub tree blob. > + * @blob: the sub tree blob. > * @size: size of the blob in bytes. > * > * Creates a new child node named @name in KHO root FDT and records > - * the physical address of @fdt. The pages of @fdt must also be preserved > + * the physical address of @blob. The pages of @blob must also be preserved > * by KHO for the new kernel to retrieve it after kexec. > * > * A debugfs blob entry is also created at > @@ -764,9 +764,9 @@ static void __init kho_reserve_scratch(void) > * > * Return: 0 on success, error code on failure > */ > -int kho_add_subtree(const char *name, void *fdt, size_t size) > +int kho_add_subtree(const char *name, void *blob, size_t size) > { > - phys_addr_t phys = virt_to_phys(fdt); > + phys_addr_t phys = virt_to_phys(blob); > void *root_fdt = kho_out.fdt; > int err = -ENOMEM; > int off, fdt_err; > @@ -789,7 +789,8 @@ int kho_add_subtree(const char *name, void *fdt, size_t size) > if (err < 0) > goto out_pack; > > - WARN_ON_ONCE(kho_debugfs_fdt_add(&kho_out.dbg, name, fdt, size, false)); > + WARN_ON_ONCE(kho_debugfs_blob_add(&kho_out.dbg, name, blob, > + size, false)); > > out_pack: > fdt_pack(root_fdt); > @@ -798,9 +799,9 @@ int kho_add_subtree(const char *name, void *fdt, size_t size) > } > EXPORT_SYMBOL_GPL(kho_add_subtree); > > -void kho_remove_subtree(void *fdt) > +void kho_remove_subtree(void *blob) > { > - phys_addr_t target_phys = virt_to_phys(fdt); > + phys_addr_t target_phys = virt_to_phys(blob); > void *root_fdt = kho_out.fdt; > int off; > int err; > @@ -822,7 +823,7 @@ void kho_remove_subtree(void *fdt) > > if ((phys_addr_t)*val == target_phys) { > fdt_del_node(root_fdt, off); > - kho_debugfs_fdt_remove(&kho_out.dbg, fdt); > + kho_debugfs_blob_remove(&kho_out.dbg, blob); > break; > } > } > @@ -1452,9 +1453,9 @@ static __init int kho_init(void) > return 0; > } > > - WARN_ON_ONCE(kho_debugfs_fdt_add(&kho_out.dbg, "fdt", > - kho_out.fdt, > - fdt_totalsize(kho_out.fdt), true)); > + WARN_ON_ONCE(kho_debugfs_blob_add(&kho_out.dbg, "fdt", > + kho_out.fdt, > + fdt_totalsize(kho_out.fdt), true)); > > return 0; > > diff --git a/kernel/liveupdate/kexec_handover_debugfs.c b/kernel/liveupdate/kexec_handover_debugfs.c > index b5a1e09ca8f14..7a100f2bf3947 100644 > --- a/kernel/liveupdate/kexec_handover_debugfs.c > +++ b/kernel/liveupdate/kexec_handover_debugfs.c > @@ -23,8 +23,9 @@ struct fdt_debugfs { > struct dentry *file; > }; > > -static int __kho_debugfs_fdt_add(struct list_head *list, struct dentry *dir, > - const char *name, const void *fdt, size_t size) > +static int __kho_debugfs_blob_add(struct list_head *list, struct dentry *dir, > + const char *name, const void *blob, > + size_t size) > { > struct fdt_debugfs *f; > struct dentry *file; > @@ -33,7 +34,7 @@ static int __kho_debugfs_fdt_add(struct list_head *list, struct dentry *dir, > if (!f) > return -ENOMEM; > > - f->wrapper.data = (void *)fdt; > + f->wrapper.data = (void *)blob; > f->wrapper.size = size; > > file = debugfs_create_blob(name, 0400, dir, &f->wrapper); > @@ -48,8 +49,8 @@ static int __kho_debugfs_fdt_add(struct list_head *list, struct dentry *dir, > return 0; > } > > -int kho_debugfs_fdt_add(struct kho_debugfs *dbg, const char *name, > - const void *fdt, size_t size, bool root) > +int kho_debugfs_blob_add(struct kho_debugfs *dbg, const char *name, > + const void *blob, size_t size, bool root) > { > struct dentry *dir; > > @@ -58,15 +59,15 @@ int kho_debugfs_fdt_add(struct kho_debugfs *dbg, const char *name, > else > dir = dbg->sub_fdt_dir; > > - return __kho_debugfs_fdt_add(&dbg->fdt_list, dir, name, fdt, size); > + return __kho_debugfs_blob_add(&dbg->fdt_list, dir, name, blob, size); > } > > -void kho_debugfs_fdt_remove(struct kho_debugfs *dbg, void *fdt) > +void kho_debugfs_blob_remove(struct kho_debugfs *dbg, void *blob) > { > struct fdt_debugfs *ff; > > list_for_each_entry(ff, &dbg->fdt_list, list) { > - if (ff->wrapper.data == fdt) { > + if (ff->wrapper.data == blob) { > debugfs_remove(ff->file); > list_del(&ff->list); > kfree(ff); > @@ -112,8 +113,8 @@ __init void kho_in_debugfs_init(struct kho_debugfs *dbg, const void *fdt) > goto err_rmdir; > } > > - err = __kho_debugfs_fdt_add(&dbg->fdt_list, dir, "fdt", fdt, > - fdt_totalsize(fdt)); > + err = __kho_debugfs_blob_add(&dbg->fdt_list, dir, "fdt", fdt, > + fdt_totalsize(fdt)); > if (err) > goto err_rmdir; > > @@ -132,8 +133,8 @@ __init void kho_in_debugfs_init(struct kho_debugfs *dbg, const void *fdt) > continue; > } > sub_fdt = phys_to_virt(*fdt_phys); > - err = __kho_debugfs_fdt_add(&dbg->fdt_list, sub_fdt_dir, name, > - sub_fdt, fdt_totalsize(sub_fdt)); > + err = __kho_debugfs_blob_add(&dbg->fdt_list, sub_fdt_dir, name, > + sub_fdt, fdt_totalsize(sub_fdt)); > if (err) { > pr_warn("failed to add fdt %s to debugfs: %pe\n", name, > ERR_PTR(err)); > diff --git a/kernel/liveupdate/kexec_handover_internal.h b/kernel/liveupdate/kexec_handover_internal.h > index 2a28cb8db9b0a..0399ff1077750 100644 > --- a/kernel/liveupdate/kexec_handover_internal.h > +++ b/kernel/liveupdate/kexec_handover_internal.h > @@ -26,19 +26,19 @@ extern unsigned int kho_scratch_cnt; > int kho_debugfs_init(void); > void kho_in_debugfs_init(struct kho_debugfs *dbg, const void *fdt); > int kho_out_debugfs_init(struct kho_debugfs *dbg); > -int kho_debugfs_fdt_add(struct kho_debugfs *dbg, const char *name, > - const void *fdt, size_t size, bool root); > -void kho_debugfs_fdt_remove(struct kho_debugfs *dbg, void *fdt); > +int kho_debugfs_blob_add(struct kho_debugfs *dbg, const char *name, > + const void *blob, size_t size, bool root); > +void kho_debugfs_blob_remove(struct kho_debugfs *dbg, void *blob); > #else > static inline int kho_debugfs_init(void) { return 0; } > static inline void kho_in_debugfs_init(struct kho_debugfs *dbg, > const void *fdt) { } > static inline int kho_out_debugfs_init(struct kho_debugfs *dbg) { return 0; } > -static inline int kho_debugfs_fdt_add(struct kho_debugfs *dbg, const char *name, > - const void *fdt, size_t size, > - bool root) { return 0; } > -static inline void kho_debugfs_fdt_remove(struct kho_debugfs *dbg, > - void *fdt) { } > +static inline int kho_debugfs_blob_add(struct kho_debugfs *dbg, > + const char *name, const void *blob, > + size_t size, bool root) { return 0; } > +static inline void kho_debugfs_blob_remove(struct kho_debugfs *dbg, > + void *blob) { } > #endif /* CONFIG_KEXEC_HANDOVER_DEBUGFS */ > > #ifdef CONFIG_KEXEC_HANDOVER_DEBUG > > -- > 2.47.3 > > -- Sincerely yours, Mike.