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um: vdso: Always reject undefined references in during linking

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Instead of using a custom script to detect and fail on undefined
references, use --no-undefined for all VDSO linker invocations.

Drop the now unused checkundef.sh script.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Link: https://patch.msgid.link/20241011-vdso-checkundef-v1-2-1a46e0352d20@linutronix.de
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Thomas Weißschuh 2024-10-11 11:18:26 +02:00 committed by Johannes Berg
parent b9ee5fc8f4
commit 90daca7c8f
2 changed files with 2 additions and 14 deletions
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5
arch/x86/um/vdso/Makefile
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@ -56,7 +56,6 @@ CFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage
quiet_cmd_vdso = VDSO $@
cmd_vdso = $(CC) -nostdlib -o $@ \
$(CC_FLAGS_LTO) $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
-Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
sh $(src)/checkundef.sh '$(NM)' '$@'
-Wl,-T,$(filter %.lds,$^) $(filter %.o,$^)
VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack
VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack -Wl,--no-undefined

11
arch/x86/um/vdso/checkundef.sh
View File

@ -1,11 +0,0 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
nm="$1"
file="$2"
$nm "$file" | grep '^ *U' > /dev/null 2>&1
if [ $? -eq 1 ]; then
exit 0
else
echo "$file: undefined symbols found" >&2
exit 1
fi