linux-kernel - [PATCH v4 0/4] tools/bootconfig: Align the bootconfig applied initrd

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Message-Id: <160571371674.277955.11736890010190945946.stgit@devnote2>
Date:   Thu, 19 Nov 2020 00:35:17 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Chen Yu <yu.c.chen@...el.com>, Chen Yu <yu.chen.surf@...il.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Jonathan Corbet <corbet@....net>
Subject: [PATCH v4 0/4] tools/bootconfig: Align the bootconfig applied initrd

Hi,

This is the 4th version of the bootconfig tool update to align
the total size of initrd + bootconfig to 4.

Previous version is here;

 https://lkml.kernel.org/r/160560676899.144950.4148778261999789656.stgit@devnote2

This version adds a new errno after printf fix patch as [1/4].

To adjust the file size, the bootconfig tool adds padding null
characters in between the boot configuration data and the footer.

The changing points are
- The bootconfig applied initrd image size is aligned to 4.
- To insert the padding null ('\0') bytes, the size in the footer
  can be bigger than the actual bootconfig file size.
- But the max size of the boot configuration file is same, because
  the max size doesn't include the last null characters.

In this series I keep 4 bytes aligned instead of longer size,
because only I could found was that the grub might align the initrd
filesize to 4, and U-Boot/EDK2 would not change it. So I couldn't
say what is the best size.

Anyway, I updated the documentation too, which clearly says that
the above changing points, and if the bootloader pass the wrong
size, kernel will not find bootconfig from the initrd.

Thank you,

---

Masami Hiramatsu (4):
      tools/bootconfig: Fix errno reference after printf()
      tools/bootconfig: Fix to check the write failure correctly
      tools/bootconfig: Align the bootconfig applied initrd image size to 4
      docs: bootconfig: Update file format on initrd image

 tools/bootconfig/main.c             |  109 ++++++++++++++++++++++-------------
 tools/bootconfig/test-bootconfig.sh |    6 ++
 2 files changed, 75 insertions(+), 40 deletions(-)

--
Masami Hiramatsu (Linaro) <mhiramat@...nel.org>