linux-kernel - Re: bpf: handling non BPF register names in inline assembly with -target bpf

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Date:   Wed, 11 Apr 2018 16:22:07 -0700
From:   Yonghong Song <yhs@...com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
CC:     Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: bpf: handling non BPF register names in inline assembly with
 -target bpf



On 4/11/18 4:17 PM, Arnaldo Carvalho de Melo wrote:
> Em Wed, Apr 11, 2018 at 04:47:29PM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Wed, Apr 11, 2018 at 12:22:37PM -0700, Yonghong Song escreveu:
>>> Look at test bpf-script-test-kbuild.c, I think you can drop
>>> uapi/asm/ptrace.h from include file list. This way, you do not need
>>> __BPF__ in x86/include/asm/asm.h. At the same time, you can
>>> remove __BPF__ as well.
>>
>> That's even better, I'll try that approach, that code was done by
>> someone else, so I ended up not considering looking if removing a
>> unnecessary header would fix the issue, I'll check and if that works
>> I'll revert the patch that introduced that ifndef __BPF__.
> 
> So this is what I've pushed to my perf/core branch:
> 
> https://git.kernel.org/acme/c/707ba03243d2 (HEAD -> perf/core) Revert "x86/asm: Allow again using asm.h when building for the 'bpf' clang target"
> https://git.kernel.org/acme/c/4364203f5563 pref tests bpf: Remove unused ptrace.h include from LLVM test

Looks good. Thank you!

> 
> Thanks,
> 
> - Arnaldo
>