linux-kernel - [PATCH resend] scripts: teach extract-vmlinux about LZ4 and ZSTD

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Date:   Sat,  7 Jul 2018 02:15:48 +0200
From:   Adam Borowski <kilobyte@...band.pl>
To:     Michal Marek <michal.lkml@...kovi.net>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kbuild@...r.kernel.org,
        Paul Menzel <pmenzel+linux-kernel@...gen.mpg.de>,
        Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
        x86@...nel.org, Ingo Molnar <mingo@...nel.org>
Cc:     Adam Borowski <kilobyte@...band.pl>
Subject: [PATCH resend] scripts: teach extract-vmlinux about LZ4 and ZSTD

Note that the LZ4 signature is different than that of modern LZ4 as we
use the "legacy" format which suffers from some downsides like inability
to disable compression.

Signed-off-by: Adam Borowski <kilobyte@...band.pl>
---
The first time this was sent I managed to screw up both the subject and
scissors line, so it's likely whatever filter you're using didn't notice
the patch inside a thread.

ZSTD compression for vmlinux is not yet in, but being able to unpack it
can't hurt.  LZ4 is in for quite a while.


 scripts/extract-vmlinux | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/extract-vmlinux b/scripts/extract-vmlinux
index 5061abcc2540..e6239f39abad 100755
--- a/scripts/extract-vmlinux
+++ b/scripts/extract-vmlinux
@@ -57,6 +57,8 @@ try_decompress '\3757zXZ\000' abcde unxz
 try_decompress 'BZh'          xy    bunzip2
 try_decompress '\135\0\0\0'   xxx   unlzma
 try_decompress '\211\114\132' xy    'lzop -d'
+try_decompress '\002!L\030'   xxx   'lz4 -d'
+try_decompress '(\265/\375'   xxx   unzstd
 
 # Bail out:
 echo "$me: Cannot find vmlinux." >&2
-- 
2.18.0