From: Johannes Berg <johannes.berg@xxxxxxxxx>
Since kernel 5.8, specifically commit 4d0831e8a029 ("kconfig: unify
cc-option and as-option"), 'make kernelversion' will call into the
Kconfig system, evaluating cc-option from scripts/Kconfig.include,
which requires a writable current working directory due to the use
of ".tmp_<pid>" for temporary files.
This was fixed upstream in commit 805b2e1d427a ("kbuild: include
Makefile.compiler only when compiler is needed").
To work around it, pass M= as suggested here:
https://lore.kernel.org/r/CAK7LNAROdVMPQq4Qn_M=OWzJrfqNOc4fyMicNKdnCqu7G9rFgw@xxxxxxxxxxxxxx
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
backport/Makefile | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/backport/Makefile b/backport/Makefile
index ee7df4ba29ce..77c2670d637e 100644
--- a/backport/Makefile
+++ b/backport/Makefile
@@ -84,8 +84,8 @@ mrproper:
echo "" ;\
done \
) > Kconfig.kernel ;\
- kver=$$($(MAKE) --no-print-directory -C $(KLIB_BUILD) kernelversion | \
- sed 's/^\(\([3-5]\|2\.6\)\.[0-9]\+\).*/\1/;t;d') ;\
+ kver=$$($(MAKE) --no-print-directory -C $(KLIB_BUILD) M=$(BACKPORT_DIR) \
+ kernelversion | sed 's/^\(\([3-5]\|2\.6\)\.[0-9]\+\).*/\1/;t;d');\
test "$$kver" != "" || echo "Kernel version parse failed!" ;\
test "$$kver" != "" ;\
kvers="$$(seq 14 39 | sed 's/^/2.6./')" ;\
--
2.30.2
--
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