linux-kernel - Re: [PATCHv5 3/4] tracing: Add register read/write tracing support

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Message-ID: <CAK8P3a2hoQHTDUs5YNWwrAk2GfD7bFh6ipvgqSttDxNdUX6jyg@mail.gmail.com>
Date:   Mon, 6 Dec 2021 11:46:24 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Sai Prakash Ranjan <quic_saipraka@...cinc.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Marc Zyngier <maz@...nel.org>,
        gregkh <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        quic_psodagud@...cinc.com,
        Prasad Sodagudi <psodagud@...eaurora.org>
Subject: Re: [PATCHv5 3/4] tracing: Add register read/write tracing support

On Mon, Dec 6, 2021 at 11:11 AM Sai Prakash Ranjan
<quic_saipraka@...cinc.com> wrote:
> On 12/6/2021 2:29 PM, Arnd Bergmann wrote:
> > On Mon, Dec 6, 2021 at 9:28 AM Sai Prakash Ranjan
> >> +void log_read_mmio(u8 width, const volatile void __iomem *addr)
> >> +{
> >> +       trace_rwmmio_read(CALLER_ADDR0, CALLER_ADDR1, width, addr);
> >> +}
> > Here, it may be better to pass the caller address as an argument, I think
> > CALLER_ADDR1 is not always reliable, though it's possible that it is
> > in the configurations when this file gets enabled.
> >
> >
>
> Do you mean that we use __builtin_return_address(0,1) directly here or
> that I pass __func__ as the argument to log_read/write_mmio or is there
> some other way to pass the caller address?

I meant passing CALLER_ADDR0 from readl() down to
log_read_mmio().

       Arnd