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Date:	Tue, 18 Feb 2014 16:08:56 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Daniel M. Weeks" <dan@...weeks.net>
Cc:	Michal Marek <mmarek@...e.cz>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org, Kyungsik Lee <kyungsik.lee@....com>
Subject: Re: [PATCH] Fix flags for initramfs LZ4 compression

On Sat, 15 Feb 2014 18:14:57 -0500 "Daniel M. Weeks" <dan@...weeks.net> wrote:

> LZ4 as implemented in the kernel differs from the default method now
> used by the reference implementation of LZ4. Until the in-kernel method
> is updated to support the new default, passing the legacy flag (-l) to
> the compressor is necessary. Without this flag the kernel-generated,
> LZ4-compressed initramfs is junk.
> 
> ...
>
> --- a/scripts/gen_initramfs_list.sh
> +++ b/scripts/gen_initramfs_list.sh
> @@ -257,7 +257,7 @@ case "$arg" in
>                  && compr="lzop -9 -f"
>  		echo "$output_file" | grep -q "\.lz4$" \
>                  && [ -x "`which lz4 2> /dev/null`" ] \
> -                && compr="lz4 -9 -f"
> +                && compr="lz4 -l -9 -f"
>  		echo "$output_file" | grep -q "\.cpio$" && compr="cat"
>  		shift
>  		;;

What happens is the user is running an old version of /bin/lz4?  A
version which predates this switch to a new format?  Do those earlier
versions accept -l, even though they don't need it?  Or will the kernel
build fail?

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