The object files in purgatory do not export symbols, so disable exports
for all the object files, not only sha256.o, with -D__DISABLE_EXPORTS.

This fixes a build failure with CONFIG_GENDWARFKSYMS, where we would
otherwise attempt to calculate symbol versions for purgatory objects and
fail because they're not built with debugging information:

error: gendwarfksyms: process_module: dwarf_get_units failed: no debugging information?
make[5]: *** [../scripts/Makefile.build:207: arch/s390/purgatory/string.o] Error 1
make[5]: *** Deleting file 'arch/s390/purgatory/string.o'

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202502120752.U3fOKScQ-lkp@intel.com/
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
 arch/s390/purgatory/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/s390/purgatory/Makefile b/arch/s390/purgatory/Makefile
index bdcf2a3b6c41..bd39b36e7bd6 100644
--- a/arch/s390/purgatory/Makefile
+++ b/arch/s390/purgatory/Makefile
@@ -8,7 +8,7 @@ PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
 $(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
 	$(call if_changed_rule,cc_o_c)
 
-CFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_FORTIFY
+CFLAGS_sha256.o := -D__NO_FORTIFY
 
 $(obj)/mem.o: $(srctree)/arch/s390/lib/mem.S FORCE
 	$(call if_changed_rule,as_o_S)
@@ -19,9 +19,11 @@ KBUILD_CFLAGS += -fno-zero-initialized-in-bss -fno-builtin -ffreestanding
 KBUILD_CFLAGS += -Os -m64 -msoft-float -fno-common
 KBUILD_CFLAGS += -fno-stack-protector
 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
+KBUILD_CFLAGS += -D__DISABLE_EXPORTS
 KBUILD_CFLAGS += $(CLANG_FLAGS)
 KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
 KBUILD_AFLAGS := $(filter-out -DCC_USING_EXPOLINE,$(KBUILD_AFLAGS))
+KBUILD_AFLAGS += -D__DISABLE_EXPORTS
 
 # Since we link purgatory with -r unresolved symbols are not checked, so we
 # also link a purgatory.chk binary without -r to check for unresolved symbols.

base-commit: 4dc1d1bec89864d8076e5ab314f86f46442bfb02
-- 
2.48.1.601.g30ceb7b040-goog

On Thu, Feb 13, 2025 at 09:16:14PM +0000, Sami Tolvanen wrote:
> The object files in purgatory do not export symbols, so disable exports
> for all the object files, not only sha256.o, with -D__DISABLE_EXPORTS.
> 
> This fixes a build failure with CONFIG_GENDWARFKSYMS, where we would
> otherwise attempt to calculate symbol versions for purgatory objects and
> fail because they're not built with debugging information:
> 
> error: gendwarfksyms: process_module: dwarf_get_units failed: no debugging information?
> make[5]: *** [../scripts/Makefile.build:207: arch/s390/purgatory/string.o] Error 1
> make[5]: *** Deleting file 'arch/s390/purgatory/string.o'
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202502120752.U3fOKScQ-lkp@intel.com/
> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
> ---
>  arch/s390/purgatory/Makefile | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

Applied, thank you!