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additional switch table entries #611

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nickdesaulniers opened this issue Jul 18, 2019 · 3 comments
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additional switch table entries #611

nickdesaulniers opened this issue Jul 18, 2019 · 3 comments
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[ARCH] x86_64 This bug impacts ARCH=x86_64 [BUG] llvm A bug that should be fixed in upstream LLVM enhancement New feature or request feature-request Not a bug per-se [FIXED][LLVM] 11 This bug was fixed in LLVM 11.0 [TOOL] objtool warning is produced by the kernel's objtool

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@nickdesaulniers
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nickdesaulniers commented Jul 18, 2019 •
edited by nathanchance
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From the discussion with @jpoimboe in https://lore.kernel.org/r/20190716231718.flutou25wemgsfju@treble/:

it seems that LLVM is producing dead entries in switch tables. It would likely cut down on code size to discard these.

I should:

  1. figure out how to reproduce
  2. file a bug upstream in LLVM's issue tracker
@nickdesaulniers nickdesaulniers added enhancement New feature or request [BUG] llvm A bug that should be fixed in upstream LLVM feature-request Not a bug per-se [ARCH] x86_64 This bug impacts ARCH=x86_64 low priority This bug is not critical and not a priority [TOOL] objtool warning is produced by the kernel's objtool labels Jul 18, 2019
@nickdesaulniers nickdesaulniers self-assigned this Jul 18, 2019
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nickdesaulniers commented Jul 18, 2019 •
edited by nathanchance
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https://lore.kernel.org/r/CAKwvOd=5jJxkRaAC+sEYOd9s3vfWDdQzN-a3YxHh-Qen7FHBpA@mail.gmail.com/

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nickdesaulniers commented Sep 27, 2019 •
edited by nathanchance
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This might be the bug I filed for this issue: https://llvm.org/pr43129
and patch: https://reviews.llvm.org/D68131

@nickdesaulniers nickdesaulniers removed their assignment Mar 16, 2020
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Looks like this would be fixed in LLVM 11 then.

@nathanchance nathanchance added [FIXED][LLVM] 11 This bug was fixed in LLVM 11.0 and removed low priority This bug is not critical and not a priority labels Jan 5, 2021
@nathanchance nathanchance mentioned this issue Jan 5, 2021
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[ARCH] x86_64 This bug impacts ARCH=x86_64 [BUG] llvm A bug that should be fixed in upstream LLVM enhancement New feature or request feature-request Not a bug per-se [FIXED][LLVM] 11 This bug was fixed in LLVM 11.0 [TOOL] objtool warning is produced by the kernel's objtool
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