linux-kernel - Re: [PATCH] kbuild: Don't report disabled nodes with duplicate addresses

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Date:   Thu, 10 Feb 2022 08:39:09 -0600
From:   Rob Herring <robh@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: Don't report disabled nodes with duplicate addresses

On Thu, Feb 10, 2022 at 12:51 AM Vinod Koul <vkoul@...nel.org> wrote:
>
> Duplicated unit address is okay if we have only one such node enabled.
> So, remove '-Wno-unique_unit_address' from DTC_FLAGS.
>
> This helps in reducing warnings in qcom dts from
>
>    6483 unique_unit_address
>    1108 simple_bus_reg
>     764 avoid_unnecessary_addr_size
>     712 unit_address_vs_reg
>     120 graph_child_address
>      32 unique_unit_address_if_enabled
>
> after this patch:
>     277 simple_bus_reg
>     191 avoid_unnecessary_addr_size
>     178 unit_address_vs_reg
>      32 unique_unit_address_if_enabled
>      30 graph_child_address

I'm confused how unique_unit_address changes the count for others?

>
> which would help people focus on the actual warnings and fix them.

Hopefully you do a 'sort -u' on the warnings to dedup them...

>
> Suggested-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>  scripts/Makefile.lib | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 79be57fdd32a..7e4f6671d950 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -299,7 +299,8 @@ quiet_cmd_gzip = GZIP    $@
>  # DTC
>  # ---------------------------------------------------------------------------
>  DTC ?= $(objtree)/scripts/dtc/dtc
> -DTC_FLAGS += -Wno-interrupt_provider
> +DTC_FLAGS += -Wno-interrupt_provider \
> +       -Wno-unique_unit_address
>
>  # Disable noisy checks by default
>  ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
> @@ -307,8 +308,9 @@ DTC_FLAGS += -Wno-unit_address_vs_reg \
>         -Wno-avoid_unnecessary_addr_size \
>         -Wno-alias_paths \
>         -Wno-graph_child_address \
> -       -Wno-simple_bus_reg \
> -       -Wno-unique_unit_address
> +       -Wno-simple_bus_reg
> +else
> +DTC_FLAGS += -Wunique_unit_address_if_enabled
>  endif
>
>  ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
> --
> 2.31.1
>