[PATCH 5.10 290/509] um: Use HOST_DIR for mrproper

[Greg Kroah-Hartman]

From: Kees Cook <keescook at chromium.org>

commit a5a319ec2c2236bb96d147c16196d2f1f3799301 upstream.

When HEADER_ARCH was introduced, the MRPROPER_FILES (then MRPROPER_DIRS)
list wasn't adjusted, leaving SUBARCH as part of the path argument.
This resulted in the "mrproper" target not cleaning up arch/x86/... when
SUBARCH was specified. Since HOST_DIR is arch/$(HEADER_ARCH), use it
instead to get the correct path.

Cc: Richard Weinberger <richard at nod.at>
Cc: Anton Ivanov <anton.ivanov at cambridgegreys.com>
Cc: Johannes Berg <johannes at sipsolutions.net>
Cc: Azeem Shaikh <azeemshaikh38 at gmail.com>
Cc: linux-um at lists.infradead.org
Fixes: 7bbe7204e937 ("um: merge Makefile-{i386,x86_64}")
Cc: stable at vger.kernel.org
Signed-off-by: Kees Cook <keescook at chromium.org>
Link: https://lore.kernel.org/r/20230606222442.never.807-kees@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 arch/um/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -147,7 +147,7 @@ export LDFLAGS_vmlinux := $(LDFLAGS_EXEC
 # When cleaning we don't include .config, so we don't include
 # TT or skas makefiles and don't clean skas_ptregs.h.
 CLEAN_FILES += linux x.i gmon.out
-MRPROPER_FILES += arch/$(SUBARCH)/include/generated
+MRPROPER_FILES += $(HOST_DIR)/include/generated
 
 archclean:
 	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \