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authorRussell King <rmk+kernel@armlinux.org.uk>2018-04-16 13:21:54 +0100
committerRussell King <rmk+kernel@armlinux.org.uk>2018-05-19 11:35:56 +0100
commit6cea14f55474ec71f1098228e0ae5dd2a8f22c0a (patch)
tree019ca00ca099ce5c9fbda6d3a7b21511aed75c3b /arch
parent1c37963b1a1600b9686c4a99857ddcb6028be884 (diff)
downloadlinux-6cea14f55474ec71f1098228e0ae5dd2a8f22c0a.tar.bz2
ARM: replace unnecessary perl with sed and the shell $(( )) operator
You can build a kernel in a cross compiling environment that doesn't have perl in the $PATH. Commit 429f7a062e3b broke that for 32 bit ARM. Fix it. As reported by Stephen Rothwell, it appears that the symbols can be either part of the BSS section or absolute symbols depending on the binutils version. When they're an absolute symbol, the $(( )) operator errors out and the build fails. Fix this as well. Fixes: 429f7a062e3b ("ARM: decompressor: fix BSS size calculation") Reported-by: Rob Landley <rob@landley.net> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Acked-by: Rob Landley <rob@landley.net> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/boot/compressed/Makefile8
1 files changed, 3 insertions, 5 deletions
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 45a6b9b7af2a..6a4e7341ecd3 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -117,11 +117,9 @@ ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj)
asflags-y := -DZIMAGE
# Supply kernel BSS size to the decompressor via a linker symbol.
-KBSS_SZ = $(shell $(CROSS_COMPILE)nm $(obj)/../../../../vmlinux | \
- perl -e 'while (<>) { \
- $$bss_start=hex($$1) if /^([[:xdigit:]]+) B __bss_start$$/; \
- $$bss_end=hex($$1) if /^([[:xdigit:]]+) B __bss_stop$$/; \
- }; printf "%d\n", $$bss_end - $$bss_start;')
+KBSS_SZ = $(shell echo $$(($$($(CROSS_COMPILE)nm $(obj)/../../../../vmlinux | \
+ sed -n -e 's/^\([^ ]*\) [AB] __bss_start$$/-0x\1/p' \
+ -e 's/^\([^ ]*\) [AB] __bss_stop$$/+0x\1/p') )) )
LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
# Supply ZRELADDR to the decompressor via a linker symbol.
ifneq ($(CONFIG_AUTO_ZRELADDR),y)