[PATCH 6.9 128/374] s390/vdso: Create .build-id links for unstripped vdso files

Greg Kroah-Hartman
2024-06-06T14:09:21Z

From: Jens Remus <jremus@linux.ibm.com>

[ Upstream commit fc2f5f10f9bc5e58d38e9fda7dae107ac04a799f ]

Citing Andy Lutomirski from commit dda1e95cee38 ("x86/vdso: Create
.build-id links for unstripped vdso files"):

"With this change, doing 'make vdso_install' and telling gdb:

set debug-file-directory /lib/modules/KVER/vdso

will enable vdso debugging with symbols. This is useful for
testing, but kernel RPM builds will probably want to manually delete
these symlinks or otherwise do something sensible when they strip
the vdso/*.so files."

Fixes: 4bff8cb54502 ("s390: convert to GENERIC_VDSO")
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
scripts/Makefile.vdsoinst | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/Makefile.vdsoinst b/scripts/Makefile.vdsoinst
index c477d17b0aa5b..a81ca735003e4 100644
--- a/scripts/Makefile.vdsoinst
+++ b/scripts/Makefile.vdsoinst
@@ -21,7 +21,7 @@ $$(dest): $$(src) FORCE
$$(call cmd,install)

# Some architectures create .build-id symlinks
-ifneq ($(filter arm sparc x86, $(SRCARCH)),)
+ifneq ($(filter arm s390 sparc x86, $(SRCARCH)),)
link := $(install-dir)/.build-id/$$(shell $(READELF) -n $$(src) | sed -n 's@^.*Build ID: \(..\)\(.*\)@\1/\2@p').debug

__default: $$(link)
--
2.43.0