[PATCH v4 4/5] arm64: vdso32: Bring vdso32-offsets.h back

["André Almeida" <andrealmeid@igalia.com>]

Commit c7767f5c43df ("arm64: vdso32: Remove unused vdso32-offsets.h")
removed vdso32-offsets.h because it was empty and therefore useless.

With the introduction of __vdso_futex_robust_try_unlock(), there is the
need to expose offsets again.

Signed-off-by: André Almeida <andrealmeid@igalia.com>
---
 arch/arm64/Makefile               | 2 +-
 arch/arm64/include/asm/vdso.h     | 3 +++
 arch/arm64/kernel/vdso32/Makefile | 8 ++++++++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 6b005c8fef70..265716644193 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -211,7 +211,7 @@ vdso_prepare: prepare0
 	include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
 ifdef CONFIG_COMPAT_VDSO
 	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
-	arch/arm64/kernel/vdso32/vdso.so
+	include/generated/vdso32-offsets.h arch/arm64/kernel/vdso32/vdso.so
 endif
 endif
 
diff --git a/arch/arm64/include/asm/vdso.h b/arch/arm64/include/asm/vdso.h
index 232b46969088..43a214b93524 100644
--- a/arch/arm64/include/asm/vdso.h
+++ b/arch/arm64/include/asm/vdso.h
@@ -10,6 +10,9 @@
 #ifndef __ASSEMBLER__
 
 #include <generated/vdso-offsets.h>
+#ifdef CONFIG_COMPAT_VDSO
+#include <generated/vdso32-offsets.h>
+#endif
 
 #define VDSO_SYMBOL(base, name)						   \
 ({									   \
diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index bea3675fa668..4bd60f059f4a 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -135,6 +135,14 @@ $(c-obj-vdso-gettimeofday): %.o: %.c FORCE
 $(asm-obj-vdso): %.o: %.S FORCE
 	$(call if_changed_dep,vdsoas)
 
+# Generate VDSO offsets using helper script
+gen-vdsosym := $(src)/../vdso/gen_vdso_offsets.sh
+quiet_cmd_vdsosym = VDSOSYM $@
+      cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
+
+include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE
+	$(call if_changed,vdsosym)
+
 # Actual build commands
 quiet_cmd_vdsold_and_vdso_check = LD32    $@
       cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)

-- 
2.54.0