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SubjectRe: [PATCH -next 0/3] x86 insn decoder test updates (Re: linux-next: Tree for October 29 (x86 posttest))

* Masami Hiramatsu <> wrote:

> Here are the patches which update x86 instruction decoder build-time
> test. As Stephen reported on linux-next, sometimes objdump decodes bad
> instructions as normal. This will cause a false positive result on x86
> insn decoder test. This patches update the test as below;
> - Show more information with V=1
> - Show in which symbol the difference places.
> - Just warning instead of build failure.

yes, -tip testing was showing such build bugs too:

Error: ffffffff8104aae3: c5 83 3d 49 80 ee lds 0xffffffffee80493d(%rbx),%eax
Error: objdump says 6 bytes, but insn_get_length() says 3 (attr:0)

it happens with older tools, such as binutils-2.17. Modern binutils
(2.19) is fine.

We dont want to remove the build error: it helped us fix a number of
real bugs in the decoder - instead please try to create a make based
workaround based on binutils, to not run the test with binutils older
than 2.19 or so.



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