linux-kernel - Re: [PATCH v1 09/13] kho: Update FDT dynamically for subtree addition/removal

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Message-ID: <mafs08qg87cde.fsf@kernel.org>
Date: Fri, 14 Nov 2025 18:27:57 +0100
From: Pratyush Yadav <pratyush@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: akpm@...ux-foundation.org,  bhe@...hat.com,  rppt@...nel.org,
  jasonmiu@...gle.com,  arnd@...db.de,  coxu@...hat.com,
  dave@...ilevsky.ca,  ebiggers@...gle.com,  graf@...zon.com,
  kees@...nel.org,  linux-kernel@...r.kernel.org,
  kexec@...ts.infradead.org,  linux-mm@...ck.org
Subject: Re: [PATCH v1 09/13] kho: Update FDT dynamically for subtree
 addition/removal

On Fri, Nov 14 2025, Pasha Tatashin wrote:

> Currently, sub-FDTs were tracked in a list (kho_out.sub_fdts) and the
> final FDT is constructed entirely from scratch during kho_finalize().
>
> We can maintain the FDT dynamically:
> 1. Initialize a valid, empty FDT in kho_init().
> 2. Use fdt_add_subnode and fdt_setprop in kho_add_subtree to
>    update the FDT immediately when a subsystem registers.
> 3. Use fdt_del_node in kho_remove_subtree to remove entries.
>
> This removes the need for the intermediate sub_fdts list and the
> reconstruction logic in kho_finalize(). kho_finalize() now
> only needs to trigger memory map serialization.
>
> Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>

Reviewed-by: Pratyush Yadav <pratyush@...nel.org>

[...]

-- 
Regards,
Pratyush Yadav