Created attachment 300616 [details] The .config tried to build against, did a make mrproper first. Under Centos6 5.16.14 built successfully but 5.16.17 fails with the same .config. HOSTCC scripts/mod/sumversion.o parse-options.c: In function ‘get_value’: parse-options.c:103:28: error: this statement may fall through [-Werror=implicit-fallthrough=] 103 | if (!(opt->flags & PARSE_OPT_NOARG)) | ^ parse-options.c:106:17: note: here 106 | case OPTION_BOOLEAN: | ^~~~ parse-options.c: In function ‘print_option_help’: parse-options.c:740:20: error: this statement may fall through [-Werror=implicit-fallthrough=] 740 | if (opts->flags & PARSE_OPT_NOARG) | ^ parse-options.c:743:9: note: here 743 | case OPTION_STRING: | ^~~~ cc1: all warnings being treated as errors make[7]: *** [/usr/src/linux-5.16.17/tools/objtool/parse-options.o] Error 1 make[6]: *** [/usr/src/linux-5.16.17/tools/objtool/libsubcmd-in.o] Error 2 make[5]: *** [/usr/src/linux-5.16.17/tools/objtool/libsubcmd.a] Error 2 make[5]: *** Waiting for unfinished jobs.... CC /usr/src/linux-5.16.17/tools/objtool/objtool.o CC /usr/src/linux-5.16.17/tools/objtool/libstring.o CC /usr/src/linux-5.16.17/tools/objtool/libctype.o LD /usr/src/linux-5.16.17/tools/objtool/arch/x86/objtool-in.o CC /usr/src/linux-5.16.17/tools/objtool/str_error_r.o CC /usr/src/linux-5.16.17/tools/objtool/librbtree.o UPD scripts/mod/devicetable-offsets.h HOSTCC scripts/mod/file2alias.o HOSTLD scripts/mod/modpost CC kernel/bounds.s CALL scripts/atomic/check-atomics.sh LD /usr/src/linux-5.16.17/tools/objtool/objtool-in.o make[4]: *** [objtool] Error 2 make[3]: *** [tools/objtool] Error 2 make[3]: *** Waiting for unfinished jobs.... UPD include/generated/bounds.h UPD include/generated/timeconst.h CC arch/x86/kernel/asm-offsets.s UPD include/generated/asm-offsets.h CALL scripts/checksyscalls.sh make[2]: *** [binrpm-pkg] Error 2 make[1]: *** [binrpm-pkg] Error 2 make: *** [__sub-make] Error 2
Make sure you've downloaded clean sources and working only with them. Linux kernel 5.15+ requires at the very least GCC 5.1 which CentOS 6 doesn't supply. https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.15-Raising-GCC
I downloaded source for both 5.16.14 and 5.16.17 directly from kernel.org. I built gcc 11.2 on Centos6 and that is what I used to compile these kernels. Kernel 5.16.14 compiled successfully and is running. Kernel 5.16.17 failed to compile with the above error using exactly the same configuration and compiler. As you can see it is a warning but since -WALL is used in the GCC make files, it results in failure.
I said gcc make files, meant kernel make files.
I'm not involved at all in this area, but bisecting the change that causes this would help a lot here.
Whatever the issue in 5.16.17 was, it is fixed in 5.16.18, I just successfully compiled a kernel for Centos6 with 5.16.18 where 5.16.17 failed, again same configuration. Therefore I suggest closing this bug.
Since 5.16 is past end of life, and 5.19 doesn't have this problem and even later in 5.16.18 it was gone, there is no reason to keep this ticket open.