From: Mark Rutland <mark.rutland@arm•com>
To: Masami Hiramatsu <mhiramat@kernel•org>
Cc: Peter Zijlstra <peterz@infradead•org>,
Stephen Rothwell <sfr@canb•auug.org.au>,
Thomas Gleixner <tglx@linutronix•de>,
Ingo Molnar <mingo@redhat•com>, "H. Peter Anvin" <hpa@zytor•com>,
Linux Kernel Mailing List <linux-kernel@vger•kernel.org>,
Linux Next Mailing List <linux-next@vger•kernel.org>,
rostedt@goodmis•org, ast@kernel•org, hjl.tools@gmail•com,
rick.p.edgecombe@intel•com, rppt@kernel•org,
linux-toolchains@vger•kernel.org, Andrew.Cooper3@citrix•com,
ndesaulniers@google•com
Subject: Re: linux-next: build warnings after merge of the tip tree
Date: Tue, 22 Mar 2022 13:15:58 +0000 [thread overview]
Message-ID: <YjnMDlS/6a4UWFQm@FVFF77S0Q05N> (raw)
In-Reply-To: <20220322143136.0e78366c3521b54b7b9385b8@kernel.org>
On Tue, Mar 22, 2022 at 02:31:36PM +0900, Masami Hiramatsu wrote:
> On Mon, 21 Mar 2022 17:48:54 +0100
> Peter Zijlstra <peterz@infradead•org> wrote:
>
> > On Mon, Mar 21, 2022 at 02:04:05PM +0100, Peter Zijlstra wrote:
> > > On Mon, Mar 21, 2022 at 01:55:49PM +0100, Peter Zijlstra wrote:
> > > > On Mon, Mar 21, 2022 at 02:03:27PM +1100, Stephen Rothwell wrote:
> > > > > Hi all,
> > > > >
> > > > > After merging the tip tree, today's linux-next build (x864 allmodconfig)
> > > > > produced these new warnings:
> > > > >
> > > > > vmlinux.o: warning: objtool: arch_rethook_prepare()+0x55: relocation to !ENDBR: arch_rethook_trampoline+0x0
> > > > > vmlinux.o: warning: objtool: arch_rethook_trampoline_callback()+0x3e: relocation to !ENDBR: arch_rethook_trampoline+0x0
> > > > > vmlinux.o: warning: objtool: unwind_next_frame()+0x93e: relocation to !ENDBR: arch_rethook_trampoline+0x0
> > > > > vmlinux.o: warning: objtool: unwind_next_frame()+0x5f2: relocation to !ENDBR: arch_rethook_trampoline+0x0
> > > > > vmlinux.o: warning: objtool: unwind_next_frame()+0x4a7: relocation to !ENDBR: arch_rethook_trampoline+0x0
> > > > > vmlinux.o: warning: objtool: __rethook_find_ret_addr()+0x81: relocation to !ENDBR: arch_rethook_trampoline+0x0
> > > > > vmlinux.o: warning: objtool: __rethook_find_ret_addr()+0x90: relocation to !ENDBR: arch_rethook_trampoline+0x0
> > > > > vmlinux.o: warning: objtool: rethook_trampoline_handler()+0x8c: relocation to !ENDBR: arch_rethook_trampoline+0x0
> > > > > vmlinux.o: warning: objtool: rethook_trampoline_handler()+0x9b: relocation to !ENDBR: arch_rethook_trampoline+0x0
> > > >
> > > > Hurmph, lemme go figure out where that code comes from, I've not seen
> > > > those.
> > >
> > > Ahh, something tracing. I'll go do some patches on top of it.
> >
> > The below gets rid of the objtool warnings.
>
> Yes, I confirmed that.
>
> > But I still think it's fairly terrible to get a (flawed) carbon copy of
> > the kretprobe code.
>
> Indeed. I would like to replace the trampoline code of kretprobe with
> rethook, eventually. There is no reason why we keep the clone.
> (But I need more arch maintainers help for that, there are too many
> archs implemented kretprobes)
FWIW, I'm more than happy to help on the arm64 side if you could Cc me for
that; I'm aware of other things in this area I'd like to clean up for
backtracing, too.
Thanks,
Mark.
next prev parent reply other threads:[~2022-03-22 13:16 UTC|newest]
Thread overview: 93+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-21 3:03 linux-next: build warnings after merge of the tip tree Stephen Rothwell
2022-03-21 12:55 ` Peter Zijlstra
2022-03-21 13:04 ` Peter Zijlstra
2022-03-21 13:08 ` Peter Zijlstra
2022-03-21 13:45 ` Peter Zijlstra
2022-03-21 14:19 ` Mark Rutland
2022-03-21 15:28 ` Peter Zijlstra
2022-03-21 15:45 ` Peter Zijlstra
2022-03-21 16:37 ` Linus Torvalds
2022-03-21 16:44 ` Peter Zijlstra
2022-03-21 16:52 ` Linus Torvalds
2022-03-21 22:05 ` Stephen Rothwell
2022-03-21 22:12 ` Alexei Starovoitov
2022-03-21 22:46 ` Stephen Rothwell
2022-03-21 22:50 ` Alexei Starovoitov
2022-03-21 22:55 ` Steven Rostedt
2022-03-22 4:51 ` Masami Hiramatsu
2022-03-22 4:53 ` Alexei Starovoitov
2022-03-22 7:42 ` Peter Zijlstra
2022-03-22 4:38 ` Masami Hiramatsu
2022-03-21 15:28 ` Steven Rostedt
2022-03-21 16:04 ` Peter Zijlstra
2022-03-21 16:12 ` Steven Rostedt
2022-03-21 16:15 ` Steven Rostedt
2022-03-21 16:22 ` Steven Rostedt
2022-03-21 16:39 ` Steven Rostedt
2022-03-21 16:40 ` Peter Zijlstra
2022-03-21 16:45 ` Steven Rostedt
2022-03-21 16:50 ` Peter Zijlstra
2022-03-21 16:54 ` Steven Rostedt
2022-03-22 7:54 ` Peter Zijlstra
2022-03-22 13:12 ` Steven Rostedt
2022-03-22 14:35 ` Peter Zijlstra
2022-03-22 15:04 ` Steven Rostedt
2022-03-22 15:19 ` Peter Zijlstra
2022-03-22 15:48 ` Peter Zijlstra
2022-03-22 16:17 ` Steven Rostedt
2022-03-23 2:23 ` Masami Hiramatsu
2022-03-23 2:42 ` Steven Rostedt
2022-03-23 6:28 ` Masami Hiramatsu
2022-03-22 14:25 ` Masami Hiramatsu
2022-03-21 16:48 ` Peter Zijlstra
2022-03-22 5:31 ` Masami Hiramatsu
2022-03-22 8:08 ` Peter Zijlstra
2022-03-22 9:14 ` Masami Hiramatsu
2022-03-22 12:07 ` Peter Zijlstra
2022-03-22 12:17 ` Peter Zijlstra
2022-03-22 12:46 ` Masami Hiramatsu
2022-03-22 13:22 ` Steven Rostedt
2022-03-22 13:15 ` Mark Rutland [this message]
2022-03-22 13:51 ` Masami Hiramatsu
2022-03-22 10:46 ` Peter Zijlstra
2022-03-22 10:59 ` Peter Zijlstra
-- strict thread matches above, loose matches on Subject: below --
2024-02-02 3:59 Stephen Rothwell
2023-12-01 0:29 Stephen Rothwell
2023-12-01 12:09 ` Uros Bizjak
2023-12-04 4:08 ` Stephen Rothwell
2023-12-04 7:02 ` Uros Bizjak
2023-12-11 5:19 ` Stephen Rothwell
2023-12-11 7:06 ` Uros Bizjak
2023-06-02 3:12 Stephen Rothwell
2022-11-21 7:41 Stephen Rothwell
2022-05-20 7:49 Stephen Rothwell
2022-04-27 0:10 Stephen Rothwell
2022-04-27 11:31 ` Borislav Petkov
2022-04-27 13:43 ` Tom Lendacky
2022-03-22 3:51 Stephen Rothwell
2022-03-22 21:52 ` Peter Zijlstra
2022-03-22 23:11 ` Stephen Rothwell
2021-12-17 3:40 Stephen Rothwell
2022-01-21 23:58 ` Stephen Rothwell
2022-03-15 2:32 ` Stephen Rothwell
2022-04-04 3:26 ` Stephen Rothwell
2021-10-12 10:20 Stephen Rothwell
2021-10-12 13:58 ` André Almeida
2020-11-30 7:05 Stephen Rothwell
2020-11-30 10:17 ` Borislav Petkov
2020-11-30 21:56 ` Ernst, Justin
2020-11-30 22:18 ` Borislav Petkov
2020-11-23 7:19 Stephen Rothwell
2020-11-23 23:03 ` Jarkko Sakkinen
2017-11-02 2:53 Stephen Rothwell
2017-11-03 21:00 ` Masami Hiramatsu
2017-11-04 8:01 ` Ingo Molnar
2017-11-04 12:16 ` Masami Hiramatsu
2017-11-13 11:31 ` Stephen Rothwell
2017-06-23 4:19 Stephen Rothwell
2016-07-14 3:49 Stephen Rothwell
2016-07-14 3:37 Stephen Rothwell
2016-07-14 4:18 ` Stephen Rothwell
2012-10-12 5:11 Stephen Rothwell
2011-01-31 4:27 Stephen Rothwell
2011-01-31 5:08 ` Jaswinder Singh
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