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Builds with CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y, such as arm allmodconfig, now fail while extracting modules.builtin.modinfo: arm-linux-gnueabihf-objcopy: vmlinux.unstripped: can't dump section '.modinfo' - it does not exist: file format not recognized /bin/sh: 1: cannot open modules.builtin.modinfo: No such file or, with LLVM: llvm-objcopy: error: 'vmlinux.unstripped': section '.modinfo' not found Nothing references the MODULE_INFO() strings, so --gc-sections discards every .modinfo input section and vmlinux.unstripped ends up with no .modinfo data. This is not new: ever since modules.builtin.modinfo started being extracted from vmlinux.unstripped, these builds have silently produced an empty file, losing the modinfo of every built-in module. An arm multi_v7_defconfig build with LD_DEAD_CODE_DATA_ELIMINATION on current mainline yields a 0 byte modules.builtin.modinfo. The switch to --dump-section only turned that into a build error. Wrap the input section in KEEP() so that the linker retains it. The output section is still (INFO), so nothing is allocated for it. With the same arm config, modules.builtin.modinfo now has 14119 entries, and on x86_64 defconfig, where nothing is garbage collected, it is byte-identical before and after this change. Found by KernelCI builds of the linus-next tree. Fixes: |
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| clocksource | ||
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| linux | ||
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