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19526717f7
When moving a symbol in the symtab its index changes and any reloc referring that symtol-table-index will need to be rewritten too. In order to facilitate this, objtool simply marks the whole reloc section 'changed' which will cause the whole section to be re-generated. However, finding the relocs that use any given symbol is implemented rather crudely -- a fully iteration of all sections and their relocs. Given that some builds have over 20k sections (kallsyms etc..) iterating all that for *each* symbol moved takes a bit of time. Instead have each symbol keep a list of relocs that reference it. This *vastly* improves build times for certain configs. Reported-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/Y2LlRA7x+8UsE1xf@hirez.programming.kicks-ass.net