Hi: I am using backport (git commit: 60f18a) and linux-stable(git commit: bb176f) with command "./gentree.py --verbose --clean ../linux-stable ../backport_test" to generate backport source. And I am going to backport the drivers to compiled linux source(tag v4.2) After setting make environment i encounter error while compiling. (I was successfully compiled before.) The error message as below: if [ "-pg" = "-pg" ]; then if [ /home/chungyi/backport_test/compat/backport-4.10.o != "scripts/mod/empty.o" ]; then ./scripts/recordmcount "/home/chungyi/backport_test/compat/backport-4.10.o"; fi; fi; gcc -Wp,-MD,/home/chungyi/backport_test/compat/.backport-4.12.o.d -I/home/chungyi/backport_test/backport-include/ -I/home/chungyi/backport_test/backport-include/uapi -I/home/chungyi/backport_test/include/ -I/home/chungyi/backport_test/include/uapi -include /home/chungyi/backport_test/backport-include/backport/backport.h -Wno-unused-but-set-variable -DCPTCFG_VERSION=\""v4.14-rc2-1-25-g60f18ad"\" -DCPTCFG_KERNEL_VERSION=\""v4.14-rc6-0-gbb176f6"\" -DCPTCFG_KERNEL_NAME=\""Linux"\" -I./arch/x86/include -Iarch/x86/include/generated/uapi -Iarch/x86/include/generated -Iinclude -I./arch/x86/include/uapi -Iarch/x86/include/generated/uapi -I./include/uapi -Iinclude/generated/uapi -include ./include/linux/kconfig.h -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -std=gnu89 -m64 -falign-jumps=1 -falign-loops=1 -mno-80387 -mno-fp-ret-in-387 -mskip-rax-setup -mtune=generic -mno-red-zone -mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args -DCONFIG_X86_X32_ABI -DCONFIG_AS_FXSAVEQ=1 -DCONFIG_AS_SSSE3=1 -DCONFIG_AS_CRC32=1 -DCONFIG_AS_AVX=1 -DCONFIG_AS_AVX2=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx -fno-delete-null-pointer-checks -O2 --param=allow-store-data-races=0 -Wframe-larger-than=1024 -fstack-protector-strong -Wno-unused-but-set-variable -fno-omit-frame-pointer -fno-optimize-sibling-calls -fno-var-tracking-assignments -g -gdwarf-4 -pg -mfentry -DCC_USING_FENTRY -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fconserve-stack -Werror=implicit-int -Werror=strict-prototypes -Werror=date-time -DCC_HAVE_ASM_GOTO -fno-pie -no-pie -Wno-pointer-sign -I/home/chungyi/backport_test/compat -DMODULE -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(backport_4.12)" -D"KBUILD_MODNAME=KBUILD_STR(compat)" -c -o /home/chungyi/backport_test/compat/.tmp_backport-4.12.o /home/chungyi/backport_test/compat/backport-4.12.c /home/chungyi/backport_test/compat/backport-4.12.c: In function ‘extack_pre_doit’: /home/chungyi/backport_test/compat/backport-4.12.c:46:26: error: lvalue required as left operand of assignment genl_info_userhdr(info) = extack; ^ /home/chungyi/backport_test/compat/backport-4.12.c:49:27: error: lvalue required as left operand of assignment genl_info_userhdr(info) = ERR_PTR(-ENOMEM); ^ /home/chungyi/backport_test/compat/backport-4.12.c:62:27: error: lvalue required as left operand of assignment genl_info_userhdr(info) = ERR_PTR(err); ^ scripts/Makefile.build:258: recipe for target '/home/chungyi/backport_test/compat/backport-4.12.o' failed make[6]: *** [/home/chungyi/backport_test/compat/backport-4.12.o] Error 1 scripts/Makefile.build:403: recipe for target '/home/chungyi/backport_test/compat' failed make[5]: *** [/home/chungyi/backport_test/compat] Error 2 Makefile:1386: recipe for target '_module_/home/chungyi/backport_test' failed make[4]: *** [_module_/home/chungyi/backport_test] Error 2 Makefile.build:6: recipe for target 'modules' failed make[3]: *** [modules] Error 2 Makefile.real:88: recipe for target 'modules' failed make[2]: *** [modules] Error 2 Makefile:40: recipe for target 'modules' failed make[1]: *** [modules] Error 2 Makefile:30: recipe for target 'default' failed make: *** [default] Error 2 -- To unsubscribe from this list: send the line "unsubscribe backports" in