kbuild: remove unnecessary in-subshell execution
The commands surrounded by ( ) are executed in a subshell, but in
most cases, we do not need to spawn an extra subshell.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index c6fc295..c0abd9a 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -271,7 +271,7 @@
# Generate an assembly file to wrap the output of the device tree compiler
quiet_cmd_dt_S_dtb= DTB $@
cmd_dt_S_dtb= \
-( \
+{ \
echo '\#include <asm-generic/vmlinux.lds.h>'; \
echo '.section .dtb.init.rodata,"a"'; \
echo '.balign STRUCT_ALIGNMENT'; \
@@ -281,7 +281,7 @@
echo '__dtb_$(subst -,_,$(*F))_end:'; \
echo '.global __dtb_$(subst -,_,$(*F))_end'; \
echo '.balign STRUCT_ALIGNMENT'; \
-) > $@
+} > $@
$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
$(call if_changed,dt_S_dtb)
@@ -335,20 +335,20 @@
)
quiet_cmd_bzip2 = BZIP2 $@
- cmd_bzip2 = (cat $(real-prereqs) | bzip2 -9 && $(size_append)) > $@
+ cmd_bzip2 = { cat $(real-prereqs) | bzip2 -9 && $(size_append); } > $@
# Lzma
# ---------------------------------------------------------------------------
quiet_cmd_lzma = LZMA $@
- cmd_lzma = (cat $(real-prereqs) | lzma -9 && $(size_append)) > $@
+ cmd_lzma = { cat $(real-prereqs) | lzma -9 && $(size_append); } > $@
quiet_cmd_lzo = LZO $@
- cmd_lzo = (cat $(real-prereqs) | lzop -9 && $(size_append)) > $@
+ cmd_lzo = { cat $(real-prereqs) | lzop -9 && $(size_append); } > $@
quiet_cmd_lz4 = LZ4 $@
- cmd_lz4 = (cat $(real-prereqs) | lz4c -l -c1 stdin stdout && \
- $(size_append)) > $@
+ cmd_lz4 = { cat $(real-prereqs) | lz4c -l -c1 stdin stdout && \
+ $(size_append); } > $@
# U-Boot mkimage
# ---------------------------------------------------------------------------
@@ -390,12 +390,11 @@
# big dictionary would increase the memory usage too much in the multi-call
# decompression mode. A BCJ filter isn't used either.
quiet_cmd_xzkern = XZKERN $@
- cmd_xzkern = (cat $(real-prereqs) | \
- sh $(srctree)/scripts/xz_wrap.sh && $(size_append)) > $@
+ cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh && \
+ $(size_append); } > $@
quiet_cmd_xzmisc = XZMISC $@
- cmd_xzmisc = (cat $(real-prereqs) | \
- xz --check=crc32 --lzma2=dict=1MiB) > $@
+ cmd_xzmisc = cat $(real-prereqs) | xz --check=crc32 --lzma2=dict=1MiB > $@
# ASM offsets
# ---------------------------------------------------------------------------