linux-kernel - Re: [PATCH 11/12] initramfs: refactor the initramfs build rules

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Date:   Fri, 3 Jan 2020 20:52:05 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Thelen <gthelen@...gle.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/12] initramfs: refactor the initramfs build rules

Hi Mashahiro.

I just browsed this fine patchset and noticed...
>  
> -#####
> -# Generate the initramfs cpio archive
> +ramfs-input := $(shell echo $(CONFIG_INITRAMFS_SOURCE))
> +cpio-data :=
> +
> +ifeq ($(words $(ramfs-input)),0)
> +
> +# If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the
> +# default contents.
> +ramfs-input := $(srctree)/$(src)/default_cpio_list
> +
> +else ifeq ($(words $(ramfs-input)),1)
> +# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
> +# .cpio or .cpio.*, use it directly as an initramfs.
> +ifneq ($(filter %.cpio,$(ramfs-input)),)
> +cpio-data := $(ramfs-input)
> +endif

This part will now work if the file is named foo.cpio.bar.
$(findstring .cpio, should be used and not $(filter %.cpio
At least if the comment describes the intended behaviour.

> +
> +ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)
> +cpio-data := $(ramfs-input)
> +# If the specified archive is suffixed with .cpio.* (i.e. already compressed),
> +# we do not double-compress it.
> +compress-y := shipped
> +endif
> +
> +endif


	Sam