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Encoding a relative NULL pointer doesn't work for KASLR, when the whole kernel image gets shifted, the __bug_table and the target string get shifted by the same amount and the relative offset is preserved. However when the target is an absolute 0 value and the __bug_table gets moved about, the end result in a pointer equivalent to kaslr_offset(), not NULL. Notably, this will generate SHN_UNDEF relocations, and Ard would really like to not have those at all. Use the empty string to denote no-string. Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org> Cc: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>