netdev - Re: [PATCH bpf-next v2 1/2] samples/bpf: change Makefile to cope with latest llvm

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Date:   Tue, 06 Oct 2020 18:50:04 +0000
From:   patchwork-bot+bpf@...nel.org
To:     Yonghong Song <yhs@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, kernel-team@...com, andriin@...com
Subject: Re: [PATCH bpf-next v2 1/2] samples/bpf: change Makefile to cope with
 latest llvm

Hello:

This series was applied to bpf/bpf-next.git (refs/heads/master):

On Mon, 5 Oct 2020 21:34:26 -0700 you wrote:
> With latest llvm trunk, bpf programs under samples/bpf
> directory, if using CORE, may experience the following
> errors:
> 
> LLVM ERROR: Cannot select: intrinsic %llvm.preserve.struct.access.index
> PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
> Stack dump:
> 0.      Program arguments: llc -march=bpf -filetype=obj -o samples/bpf/test_probe_write_user_kern.o
> 1.      Running pass 'Function Pass Manager' on module '<stdin>'.
> 2.      Running pass 'BPF DAG->DAG Pattern Instruction Selection' on function '@..._prog1'
>  #0 0x000000000183c26c llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
>     (/data/users/yhs/work/llvm-project/llvm/build.cur/install/bin/llc+0x183c26c)
> ...
>  #7 0x00000000017c375e (/data/users/yhs/work/llvm-project/llvm/build.cur/install/bin/llc+0x17c375e)
>  #8 0x00000000016a75c5 llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*)
>     (/data/users/yhs/work/llvm-project/llvm/build.cur/install/bin/llc+0x16a75c5)
>  #9 0x00000000016ab4f8 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*,
>     unsigned int) (/data/users/yhs/work/llvm-project/llvm/build.cur/install/bin/llc+0x16ab4f8)
> ...
> Aborted (core dumped) | llc -march=bpf -filetype=obj -o samples/bpf/test_probe_write_user_kern.o
> 
> [...]

Here is the summary with links:
  - [bpf-next,v2,1/2] samples/bpf: change Makefile to cope with latest llvm
    https://git.kernel.org/bpf/bpf-next/c/9618bde489b2
  - [bpf-next,v2,2/2] samples/bpf: fix a compilation error with fallthrough marking
    https://git.kernel.org/bpf/bpf-next/c/544d6adf3c3d

You are awesome, thank you!
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