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Date:   Tue, 12 Dec 2023 09:54:48 -0600
From:   Andrew Halaney <ahalaney@redhat.com>
To:     Neil Armstrong <neil.armstrong@linaro.org>
Cc:     Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] soc: qcom: pmic_pdcharger_ulog: Search current
 directory for headers
Message-ID: <k77ayy4xwlnghjefvw3yl4aenwyq272pezjaazx65bvdle37et@5fnbae4fxnjz>
References: <20231205-pmicpdcharger-ulog-fixups-v1-0-71c95162cb84@redhat.com>
 <20231205-pmicpdcharger-ulog-fixups-v1-1-71c95162cb84@redhat.com>
 <320864f5-fdd2-4345-a0dd-b97bcf17f473@linaro.org>
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On Tue, Dec 12, 2023 at 04:23:20PM +0100, Neil Armstrong wrote:
> Hi Andrew,
> 
> On 06/12/2023 00:05, Andrew Halaney wrote:
> > As specified in samples/trace_events/Makefile:
> > 
> >      If you include a trace header outside of include/trace/events
> >      then the file that does the #define CREATE_TRACE_POINTS must
> >      have that tracer file in its main search path. This is because
> >      define_trace.h will include it, and must be able to find it from
> >      the include/trace directory.
> > 
> > Without this the following compilation error is seen:
> > 
> >        CC      drivers/soc/qcom/pmic_pdcharger_ulog.o
> >      In file included from drivers/soc/qcom/pmic_pdcharger_ulog.h:36,
> >                       from drivers/soc/qcom/pmic_pdcharger_ulog.c:15:
> >      ./include/trace/define_trace.h:95:42: fatal error: ./pmic_pdcharger_ulog.h: No such file or directory
> >         95 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
> >            |                                          ^
> >      compilation terminated.
> 
> I never experienced such error, and no CI even reported it, can you explain how you got this ?

To be honest, I am unsure why I'm experiencing this (and until I saw
another thread about it today I thought maybe I had screwed something
up!).

I just took it as an opportunity to try and read up on the tracing
infrastructure and sent this series. Definitely no expertise with the
in's and out's of tracing :)

I'm able to reproduce this on next-20231211:

    ahalaney@fedora ~/git/linux-next (git)-[b4/b4-stmmac-handle-mdio-enodev] % ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make mrproper
    <snip>
    ahalaney@fedora ~/git/linux-next (git)-[b4/b4-stmmac-handle-mdio-enodev] % ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make defconfig
    <snip>
    *** Default configuration is based on 'defconfig'
    #
    # configuration written to .config
    #
    130 ahalaney@fedora ~/git/linux-next (git)-[b4/b4-stmmac-handle-mdio-enodev] % ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make drivers/soc/qcom/pmic_pdcharger_ulog.o
      HOSTCC  scripts/dtc/dtc.o
    <snip>
      CC      drivers/soc/qcom/pmic_pdcharger_ulog.o
    In file included from drivers/soc/qcom/pmic_pdcharger_ulog.h:36,
		     from drivers/soc/qcom/pmic_pdcharger_ulog.c:15:
    ./include/trace/define_trace.h:95:42: fatal error: ./pmic_pdcharger_ulog.h: No such file or directory
       95 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
    <snip>
    2 ahalaney@fedora ~/git/linux-next (git)-[b4/b4-stmmac-handle-mdio-enodev] %

I even tried it in a fedora container with the above build commands and
the following podman invocation (plus some package installs) and saw the error:

    podman run -it -v ~/git/linux-next:/linux-next:z quay.io/fedora/fedora:latest /bin/bash

So I'm unsure if it's a fedora package version thing (which I'm running on my host)
or something else... Once I saw it was sort of spelled out in the
examples I referenced here I just decided it was something needed
fixing, regardless of why I'm hitting it while others seem ok.

> 
> Thanks,
> Neil
> 
> > 
> > Fixes: 086fdb48bc65 ("soc: qcom: add ADSP PDCharger ULOG driver")
> > Signed-off-by: Andrew Halaney <ahalaney@redhat.com>
> > ---
> >   drivers/soc/qcom/Makefile | 1 +
> >   1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
> > index 110108e23669..05b3d54e8dc9 100644
> > --- a/drivers/soc/qcom/Makefile
> > +++ b/drivers/soc/qcom/Makefile
> > @@ -10,6 +10,7 @@ obj-$(CONFIG_QCOM_PDR_HELPERS)	+= pdr_interface.o
> >   obj-$(CONFIG_QCOM_PMIC_GLINK)	+= pmic_glink.o
> >   obj-$(CONFIG_QCOM_PMIC_GLINK)	+= pmic_glink_altmode.o
> >   obj-$(CONFIG_QCOM_PMIC_PDCHARGER_ULOG)	+= pmic_pdcharger_ulog.o
> > +CFLAGS_pmic_pdcharger_ulog.o	:=  -I$(src)
> >   obj-$(CONFIG_QCOM_QMI_HELPERS)	+= qmi_helpers.o
> >   qmi_helpers-y	+= qmi_encdec.o qmi_interface.o
> >   obj-$(CONFIG_QCOM_RAMP_CTRL)	+= ramp_controller.o
> > 
>