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Message-ID: <CAD8CoPCen5Vx33Q1hYJ4T7Q9xhZa63OA52B606omkBttRWpkFg@mail.gmail.com>
Date: Tue, 16 May 2023 17:35:50 +0800
From: Ze Gao <zegao2021@...il.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Albert Ou <aou@...s.berkeley.edu>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Alexei Starovoitov <ast@...nel.org>,
Borislav Petkov <bp@...en8.de>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Heiko Carstens <hca@...ux.ibm.com>,
"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
Palmer Dabbelt <palmer@...belt.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>,
Vasily Gorbik <gor@...ux.ibm.com>, x86@...nel.org,
linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
linux-s390@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
bpf@...r.kernel.org, Conor Dooley <conor@...nel.org>,
Jiri Olsa <jolsa@...nel.org>, Yonghong Song <yhs@...com>,
Ze Gao <zegao@...cent.com>
Subject: Re: [PATCH v2 2/4] fprobe: make fprobe_kprobe_handler recursion free
Thanks for pointing this out, I'll get it all fixed ASAP.
Regards,
Ze
On Tue, May 16, 2023 at 5:16 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Tue, May 16, 2023 at 03:18:28PM +0800, Ze Gao wrote:
>
> > +static void fprobe_handler(unsigned long ip, unsigned long parent_ip,
> > + struct ftrace_ops *ops, struct ftrace_regs *fregs)
> > +{
> > + struct fprobe *fp;
> > + int bit;
> > +
> > + fp = container_of(ops, struct fprobe, ops);
> > + if (fprobe_disabled(fp))
> > + return;
> > +
> > + /* recursion detection has to go before any traceable function and
> > + * all functions before this point should be marked as notrace
> > + */
> > + bit = ftrace_test_recursion_trylock(ip, parent_ip);
> > + if (bit < 0) {
> > + fp->nmissed++;
> > + return;
> > + }
> > + __fprobe_handler(ip, parent_ip, ops, fregs);
> > ftrace_test_recursion_unlock(bit);
> > +
> > }
> > NOKPROBE_SYMBOL(fprobe_handler);
> >
> > static void fprobe_kprobe_handler(unsigned long ip, unsigned long parent_ip,
> > struct ftrace_ops *ops, struct ftrace_regs *fregs)
> > {
> > - struct fprobe *fp = container_of(ops, struct fprobe, ops);
> > + struct fprobe *fp;
> > + int bit;
> > +
> > + fp = container_of(ops, struct fprobe, ops);
> > + if (fprobe_disabled(fp))
> > + return;
> > +
> > + /* recursion detection has to go before any traceable function and
> > + * all functions called before this point should be marked as notrace
> > + */
> > + bit = ftrace_test_recursion_trylock(ip, parent_ip);
> > + if (bit < 0) {
> > + fp->nmissed++;
> > + return;
> > + }
>
> Please don't use this comment style; multi line comments go like:
>
> /*
> * Multi line comment ...
> * ... is symmetric.
> */
>
> Same for your next patch.
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