Those are left presumably from aborted ccache(1) compilations:

	arch/x86/kernel/.tmp_io_apic_64.o.T5veul
	arch/x86/kvm/.tmp_x86.o.SZWn69
	arch/x86/mm/.tmp_pgtable.o.sL1LTf
	drivers/ieee1394/.tmp_ieee1394_transactions.o.bUj6o1
	drivers/infiniband/hw/mlx4/.tmp_main.o.vy0ep6

BTW, with git there is nice way to check for such nuisainces:

	make mrproper
	git-ls-files -o

should give empty output.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

 Makefile |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/Makefile
+++ b/Makefile
@@ -1133,7 +1133,8 @@ clean: archclean $(clean-dirs)
 	@find . $(RCS_FIND_IGNORE) \
 		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
-		-o -name '*.symtypes' -o -name 'modules.order' \) \
+		-o -name '*.symtypes' -o -name 'modules.order'	\
+		-o -name '*.o.*' \) \
 		-type f -print | xargs rm -f
 
 # mrproper - Delete all generated files, including .config

--
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