On 16 November 2017 at 21:37, Sami Tolvanen <samitolvanen@xxxxxxxxxx> wrote: > On Thu, Nov 16, 2017 at 04:34:03PM +0000, Ard Biesheuvel wrote: >> You still have not explained to us how GOLD avoids the erratum. > > Sorry, I didn't realize you were asking that. If gold spots erratum > sequences, looks like it creates stubs to break them up: > > https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gold/aarch64.cc#l8396 > > It also attempts to optimize the code by replacing adrps in these > sequences with adr where possible, but otherwise doesn't appear to > touch them: > > https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gold/aarch64.cc#l2053 > OK, so my concern here is that this code probably only operates on fully linked binaries, and not partially linked object files like kernel modules. The same applies to ld.bfd, which is why we need to use the large module instead of a code model that may emit adrp instructions.. What is preventing us from using the large model with clang? I know it uses movk/movz pairs rather than literals, but this shouldn't matter for modules, given that we support static ELF relocations. -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
