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Message-Id: <20220109181529.351420-5-masahiroy@kernel.org>
Date: Mon, 10 Jan 2022 03:15:29 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: linux-kbuild@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH 5/5] kbuild: add cmd_file_size
Some architectures support self-extracting kernel, which embeds the
compressed vmlinux.
It has 4 byte data at the end so the decompressor can know the vmlinux
size beforehand.
GZIP natively has it in the trailer, but for the other compression
algorithms, the hand-crafted trailer is added.
It is unneeded to generate such _corrupted_ compressed files because
it is possible to pass the size data separately.
For example, the assembly code:
.incbin "compressed-vmlinux-with-size-data-appended"
can be transformed to:
.incbin "compressed-vmlinux"
.incbin "size-data"
My hope is, after some reworks of the decompressors, the macros
cmd_{bzip2,lzma,lzo,lz4,xzkern,zstd22} will go away.
This new macro, cmd_file_size, will be useful to generate a separate
size-data file.
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---
scripts/Makefile.lib | 3 +++
1 file changed, 3 insertions(+)
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 4207a72d429f..05ca77706f6b 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -394,6 +394,9 @@ printf "%08x\n" $$dec_size | \
} \
)
+quiet_cmd_file_size = GEN $@
+ cmd_file_size = $(size_append) > $@
+
quiet_cmd_bzip2 = BZIP2 $@
cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@
--
2.32.0
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