linux-kernel - Re: [PATCH 2/6] ptrace: introduce ptrace_syscall_enter to consolidate PTRACE

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Message-ID: <20190304104643.GA28643@e107155-lin>
Date:   Mon, 4 Mar 2019 10:46:43 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     "Haibo Xu (Arm Technology China)" <Haibo.Xu@....com>
Cc:     "x86@...nel.org" <x86@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        Catalin Marinas <Catalin.Marinas@....com>,
        Will Deacon <Will.Deacon@....com>,
        Oleg Nesterov <oleg@...hat.com>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Richard Weinberger <richard@....at>,
        "jdike@...toit.com" <jdike@...toit.com>,
        Steve Capper <Steve.Capper@....com>,
        "Bin Lu (Arm Technology China)" <Bin.Lu@....com>
Subject: Re: [PATCH 2/6] ptrace: introduce ptrace_syscall_enter to
 consolidate PTRACE_SYSEMU handling

On Mon, Mar 04, 2019 at 08:03:47AM +0000, Haibo Xu (Arm Technology China) wrote:
> On 2019/3/1 2:32, Sudeep Holla wrote:
> > Currently each architecture handles PTRACE_SYSEMU in very similar way.
> > It's completely arch independent and can be handled in the code helping
> > to consolidate PTRACE_SYSEMU handling.
> > 
> > Let's introduce a hook 'ptrace_syscall_enter' that arch specific syscall
> > entry code can call.
> > 
> 
> The 'ptrace_syscall_enter' is dedicated for PTRACE_SYSEMU flag,
> So I suggest to rename the function to something like 'ptrace_syscall_emu_enter".
> 

I am fine to rename.

> > +/*
> > + * Hook to check and report for PTRACE_SYSEMU, can be called from arch
> > + * arch syscall entry code
> > + */
> > +long ptrace_syscall_enter(struct pt_regs *regs)
> > +{
> > +#ifdef TIF_SYSCALL_EMU
> > +	if (test_thread_flag(TIF_SYSCALL_EMU)) {
> > +		if (tracehook_report_syscall_entry(regs));
> 
> Shall we remove the semi-colon at end of the above line?
> 

Added intentionally to keep GCC happy.

--
Regards,
Sudeep