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Message-ID: <20240614200729.GA1585004@thelio-3990X>
Date: Fri, 14 Jun 2024 13:07:29 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Jiri Olsa <olsajiri@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Oleg Nesterov <oleg@...hat.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>, linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org, linux-api@...r.kernel.org,
linux-man@...r.kernel.org, x86@...nel.org, bpf@...r.kernel.org,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
"Borislav Petkov (AMD)" <bp@...en8.de>,
Ingo Molnar <mingo@...hat.com>, Andy Lutomirski <luto@...nel.org>,
"Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
Deepak Gupta <debug@...osinc.com>,
Huacai Chen <chenhuacai@...nel.org>, loongarch@...ts.linux.dev
Subject: Re: [PATCHv8 bpf-next 3/9] uprobe: Add uretprobe syscall to speed up
return probe
On Fri, Jun 14, 2024 at 09:26:59PM +0200, Jiri Olsa wrote:
> On Fri, Jun 14, 2024 at 10:48:22AM -0700, Nathan Chancellor wrote:
> > Hi Jiri,
> >
> > On Tue, Jun 11, 2024 at 01:21:52PM +0200, Jiri Olsa wrote:
> > > Adding uretprobe syscall instead of trap to speed up return probe.
> > ...
> > > diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> > > index 2c83ba776fc7..2816e65729ac 100644
> > > --- a/kernel/events/uprobes.c
> > > +++ b/kernel/events/uprobes.c
> > > @@ -1474,11 +1474,20 @@ static int xol_add_vma(struct mm_struct *mm, struct xol_area *area)
> > > return ret;
> > > }
> > >
> > > +void * __weak arch_uprobe_trampoline(unsigned long *psize)
> > > +{
> > > + static uprobe_opcode_t insn = UPROBE_SWBP_INSN;
> >
> > This change as commit ff474a78cef5 ("uprobe: Add uretprobe syscall to
> > speed up return probe") in -next causes the following build error for
> > ARCH=loongarch allmodconfig:
> >
> > In file included from include/linux/uprobes.h:49,
> > from include/linux/mm_types.h:16,
> > from include/linux/mmzone.h:22,
> > from include/linux/gfp.h:7,
> > from include/linux/xarray.h:16,
> > from include/linux/list_lru.h:14,
> > from include/linux/fs.h:13,
> > from include/linux/highmem.h:5,
> > from kernel/events/uprobes.c:13:
> > kernel/events/uprobes.c: In function 'arch_uprobe_trampoline':
> > arch/loongarch/include/asm/uprobes.h:12:33: error: initializer element is not constant
> > 12 | #define UPROBE_SWBP_INSN larch_insn_gen_break(BRK_UPROBE_BP)
> > | ^~~~~~~~~~~~~~~~~~~~
> > kernel/events/uprobes.c:1479:39: note: in expansion of macro 'UPROBE_SWBP_INSN'
> > 1479 | static uprobe_opcode_t insn = UPROBE_SWBP_INSN;
>
> reproduced, could you please try the change below
Yeah, that fixes the issue for me.
Tested-by: Nathan Chancellor <nathan@...nel.org> # build
> ---
> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> index 2816e65729ac..6986bd993702 100644
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -1476,8 +1476,9 @@ static int xol_add_vma(struct mm_struct *mm, struct xol_area *area)
>
> void * __weak arch_uprobe_trampoline(unsigned long *psize)
> {
> - static uprobe_opcode_t insn = UPROBE_SWBP_INSN;
> + static uprobe_opcode_t insn;
>
> + insn = insn ?: UPROBE_SWBP_INSN;
> *psize = UPROBE_SWBP_INSN_SIZE;
> return &insn;
> }
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