The problem seems to be in fs/ntfs3/frecord.c. Original messages were in German, so here's my translation (original at the end of the post):

[...] CC lib/zstd/common/zstd_common.o CC arch/x86/kernel/cpu/feat_ctl.o fs/ntfs3/frecord.c: In Funktion »ni_read_frame«: fs/ntfs3/frecord.c:2460:16: Error: variable >>i_size<< is not used" [-Werror=unused-variable] 2460 | loff_t i_size = i_size_read(&ni->vfs_inode); | ^~~~~~ AR lib/zstd/built-in.a [...] cc1: All warnings are treated as errors make[4]: *** [scripts/Makefile.build:243: fs/ntfs3/frecord.o] error 1 make[3]: *** [scripts/Makefile.build:480: fs/ntfs3] error 2 make[3]: *** Waiting for not yet finished processes.... [...]

Let me know if you need further information. Thanks.

Rainer

-- Original messages: [...] CC lib/zstd/common/zstd_common.o CC arch/x86/kernel/cpu/feat_ctl.o fs/ntfs3/frecord.c: In Funktion »ni_read_frame«: fs/ntfs3/frecord.c:2460:16: Fehler: Variable »i_size« wird nicht verwendet [-Werror=unused-variable] 2460 | loff_t i_size = i_size_read(&ni->vfs_inode); | ^~~~~~ AR lib/zstd/built-in.a CC lib/bug.o CC fs/udf/inode.o CC arch/x86/kernel/cpu/intel.o CC arch/x86/kernel/process_64.o CC kernel/events/callchain.o CC lib/buildid.o cc1: Alle Warnungen werden als Fehler behandelt make[4]: *** [scripts/Makefile.build:243: fs/ntfs3/frecord.o] Fehler 1 make[3]: *** [scripts/Makefile.build:480: fs/ntfs3] Fehler 2 make[3]: *** Es wird auf noch nicht beendete Prozesse gewartet.... CC kernel/events/hw_breakpoint.o CC lib/clz_tab.o CC lib/cmdline.o CC fs/udf/lowlevel.o [...]