linux-kernel - Re: linux-next: build failure after merge of the tip tree

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Date:   Sat, 27 Mar 2021 12:50:55 +0100
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Borislav Petkov <bp@...e.de>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the tip tree

On Fri, Mar 26, 2021 at 2:11 PM Borislav Petkov <bp@...e.de> wrote:
>
> On Fri, Mar 26, 2021 at 09:57:43AM +0100, Sedat Dilek wrote:
> > The commit b90829704780 "bpf: Use NOP_ATOMIC5 instead of
> > emit_nops(&prog, 5) for BPF_TRAMP_F_CALL_ORIG" is now in Linus Git
> > (see [1]).
> >
> > Where will Stephen's fixup-patch be carried?
> > Linux-next?
> > net-next?
> > <tip.git#x86/cpu>?
>
> I guess we'll resolve it on our end and pick up sfr's patch, most
> likely.
>
> Thanks for letting me know.
>

Sounds good to me.

So you need:

$ grep CONFIG_BPF_JIT= .config
1795:CONFIG_BPF_JIT=y

$ git grep CONFIG_BPF_JIT arch/x86/net/Makefile
arch/x86/net/Makefile:        obj-$(CONFIG_BPF_JIT) += bpf_jit_comp32.o
arch/x86/net/Makefile:        obj-$(CONFIG_BPF_JIT) += bpf_jit_comp.o

I wonder why Stephen's fixup-patch was not carried in recent
Linux-next releases.
Wild speculation - no random-config with x86(-64) plus CONFIG_BPF_JIT=y?

Anyway, I integrated Stephen's fixup-patch into my custom patchset.

$ git log --oneline --author="Stephen Rothwell" v5.12-rc4..
600417efac59 (for-5.12/x86-cpu-20210315-net-bpf-sfr) x86: fix up for
"bpf: Use NOP_ATOMIC5 instead of emit_nops(&prog, 5) for
BPF_TRAMP_F_CALL_ORIG"

Feel free to add my:

Tested-by: Sedat Dilek <sedat.dilek@...il.com> # LLVM/Clang v12.0.0-rc3 (x86-64)

- Sedat -