arm64: clean vdso & vdso32 files

commit a5b8ca97fbf8 ("arm64: do not descend to vdso directories twice") changes the cleaning behavior of arm64's vdso files, in that vdso.lds, vdso.so, and vdso.so.dbg are not removed upon a 'make clean/mrproper':

$ make defconfig ARCH=arm64
$ make ARCH=arm64
$ make mrproper ARCH=arm64
$ git clean -nxdf
Would remove arch/arm64/kernel/vdso/vdso.lds
Would remove arch/arm64/kernel/vdso/vdso.so
Would remove arch/arm64/kernel/vdso/vdso.so.dbg

To remedy this, manually descend into arch/arm64/kernel/vdso upon cleaning.

After this commit:

$ make defconfig ARCH=arm64
$ make ARCH=arm64
$ make mrproper ARCH=arm64
$ git clean -nxdf
<empty>

Similar results are obtained for the vdso32 equivalent.

---
Changelog since v1:
- Also descend into vdso32 upon archclean
- Add stable to cc in signoff area

 arch/arm64/Makefile | 2 ++
 1 file changed, 2 insertions(+)

index b52481f0605d..02997b253dee 100644
@@ -181,6 +181,8 @@ archprepare:
 # We use MRPROPER_FILES and CLEAN_FILES now
 archclean:
 	$(Q)$(MAKE) $(clean)=$(boot)
+	$(Q)$(MAKE) $(clean)=arch/arm64/kernel/vdso
+	$(Q)$(MAKE) $(clean)=arch/arm64/kernel/vdso32
 
 ifeq ($(KBUILD_EXTMOD),)
 # We need to generate vdso-offsets.h before compiling certain files in kernel/.

2.32.0.605.g8dce9f2422-goog

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64: clean vdso & vdso32 files

      https://git.kernel.org/arm64/c/017f5fb9ce79

Cheers,

Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev