linux-kernel - [PATCH 0/2] bootconfig: Support early options in embedded config

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Message-Id: <20231121231342.193646-1-oss@malat.biz>
Date:   Wed, 22 Nov 2023 00:13:40 +0100
From:   Petr Malat <oss@...at.biz>
To:     linux-kernel@...r.kernel.org
Cc:     mhiramat@...nel.org, paulmck@...nel.org, rostedt@...dmis.org,
        oss@...at.biz
Subject: [PATCH 0/2] bootconfig: Support early options in embedded config

These 2 patches add a support for specifying early options in embedded
bootconfig and merging embedded and initrd bootconfig into one.

To allow handling of early options, it's necessary to eliminate allocations
from embedded bootconfig handling, which can be done by parsing the config
data in place and allocating xbc_nodes array statically.

Later, when initrd is available, it either replaces embedded data or is
appended to them. To append initrd data, it's necessary to relocate already
parsed data to a bigger memory chunk, but that's not a problem, because
xbc_node structure uses offsets and not absolute pointers.

Also, update the documentation to make users aware early options can't be
configured in the initrd.