Netdev Archive on lore.kernel.org
 help / color / Atom feed
From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: X86 ML <x86@kernel.org>, Alexei Starovoitov <ast@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Network Development <netdev@vger.kernel.org>,
	bpf <bpf@vger.kernel.org>, Peter Zijlstra <peterz@infradead.org>,
	Song Liu <songliubraving@fb.com>, Kairui Song <kasong@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	David Laight <David.Laight@aculab.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH v2 4/5] x86/bpf: Fix 64-bit JIT frame pointer usage
Date: Fri, 14 Jun 2019 14:27:30 -0700
Message-ID: <CAADnVQJ0dmxYTnaQC1UiSo7MhcTy2KRWJWJKw4jyxFWby-JgRg@mail.gmail.com> (raw)
In-Reply-To: <20190614211916.jnxakyfwilcv6r57@treble>

On Fri, Jun 14, 2019 at 2:19 PM Josh Poimboeuf <jpoimboe@redhat.com> wrote:
>
> On Fri, Jun 14, 2019 at 02:05:56PM -0700, Alexei Starovoitov wrote:
> > Have you tested it ?
> > I really doubt, since in my test both CONFIG_UNWINDER_ORC and
> > CONFIG_UNWINDER_FRAME_POINTER failed to unwind through such odd frame.
>
> Hm, are you seeing selftest failures?  They seem to work for me.
>
> > Here is much simple patch that I mentioned in the email yesterday,
> > but you failed to listen instead of focusing on perceived 'code readability'.
> >
> > It makes one proper frame and both frame and orc unwinders are happy.
>
> I'm on my way out the door and I just skimmed it, but it looks fine.
>
> Some of the code and patch description look familiar, please be sure to
> give me proper credit.

credit means something positive.
your contribution to bpf jit fix was negative.
I'm going to rewrite the fix from relying on patch 3.

  reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-14 17:56 [PATCH v2 0/5] x86/bpf: unwinder fixes Josh Poimboeuf
2019-06-14 17:56 ` [PATCH v2 1/5] perf/x86: Always store regs->ip in perf_callchain_kernel() Josh Poimboeuf
2019-06-14 20:56   ` Alexei Starovoitov
2019-06-14 21:06     ` Josh Poimboeuf
2019-06-14 21:16       ` Steven Rostedt
2019-06-14 21:20         ` Song Liu
2019-06-14 17:56 ` [PATCH v2 2/5] objtool: Fix ORC unwinding in non-JIT BPF generated code Josh Poimboeuf
2019-06-14 20:58   ` Alexei Starovoitov
2019-06-14 21:07     ` Josh Poimboeuf
2019-06-14 21:09       ` Alexei Starovoitov
2019-06-14 21:19         ` Josh Poimboeuf
2019-06-14 21:22           ` Alexei Starovoitov
2019-06-14 23:17             ` Josh Poimboeuf
2019-06-14 23:30               ` Alexei Starovoitov
2019-06-15  0:02                 ` Josh Poimboeuf
2019-06-15  0:06                   ` abhja kaanlani
2019-06-15  0:07                   ` Alexei Starovoitov
2019-06-17 14:57     ` David Laight
2019-06-14 17:56 ` [PATCH v2 3/5] x86/bpf: Move epilogue generation to a dedicated function Josh Poimboeuf
2019-06-14 17:56 ` [PATCH v2 4/5] x86/bpf: Fix 64-bit JIT frame pointer usage Josh Poimboeuf
2019-06-14 21:05   ` Alexei Starovoitov
2019-06-14 21:19     ` Josh Poimboeuf
2019-06-14 21:27       ` Alexei Starovoitov [this message]
2019-06-14 23:13         ` Josh Poimboeuf
2019-06-14 23:23           ` Alexei Starovoitov
2019-06-14 23:54             ` Josh Poimboeuf
2019-06-15  0:02               ` Alexei Starovoitov
2019-06-15  4:27                 ` Josh Poimboeuf
2019-06-15  5:16                   ` Alexei Starovoitov
2019-06-15 12:57                     ` Josh Poimboeuf
2019-06-14 17:56 ` [PATCH v2 5/5] x86/unwind/orc: Fall back to using frame pointers for generated code Josh Poimboeuf

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAADnVQJ0dmxYTnaQC1UiSo7MhcTy2KRWJWJKw4jyxFWby-JgRg@mail.gmail.com \
    --to=alexei.starovoitov@gmail.com \
    --cc=David.Laight@aculab.com \
    --cc=ast@kernel.org \
    --cc=bp@alien8.de \
    --cc=bpf@vger.kernel.org \
    --cc=daniel@iogearbox.net \
    --cc=jpoimboe@redhat.com \
    --cc=kasong@redhat.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=peterz@infradead.org \
    --cc=rostedt@goodmis.org \
    --cc=songliubraving@fb.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Netdev Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/netdev/0 netdev/git/0.git
	git clone --mirror https://lore.kernel.org/netdev/1 netdev/git/1.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 netdev netdev/ https://lore.kernel.org/netdev \
		netdev@vger.kernel.org netdev@archiver.kernel.org
	public-inbox-index netdev


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.netdev


AGPL code for this site: git clone https://public-inbox.org/ public-inbox