netdev - Re: [PATCH 05/11] vmlinux.lds.h: Preserve DTB sections from being discarded after init

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Message-ID: <146d3866ec57e963713cd07b9eaf5a71.sboyd@kernel.org>
Date: Mon, 23 Sep 2024 11:13:47 -0700
From: Stephen Boyd <sboyd@...nel.org>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Andrea della Porta <andrea.porta@...e.com>, Andrew Lunn <andrew@...n.ch>, Arnd Bergmann <arnd@...db.de>, Bjorn Helgaas <bhelgaas@...gle.com>, Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, Catalin Marinas <catalin.marinas@....com>, Claudiu Beznea <claudiu.beznea@...on.dev>, Conor Dooley <conor+dt@...nel.org>, David S. Miller <davem@...emloft.net>, Derek Kiernan <derek.kiernan@....com>, Dragan Cvetic <dragan.cvetic@....com>, Eric Dumazet <edumazet@...gle.com>, Florian Fainelli <florian.fainelli@...adcom.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jakub Kicinski <kuba@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Lee Jones <lee@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, Michael Turquette <mturquette@...libre.com>, Nicolas Ferre <nicolas.ferre@...rochip.com>, Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>, Stefan Wahren <wahrenst@....net>, Will Deacon <will@...nel.o
 rg>, devicetree@...r.kernel.org, linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org, netdev@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 05/11] vmlinux.lds.h: Preserve DTB sections from being discarded after init

Quoting Masahiro Yamada (2024-09-22 01:14:12)
> 
> Rather, I'd modify my patch as follows:
> 
> --- a/scripts/Makefile.dtbs
> +++ b/scripts/Makefile.dtbs
> @@ -34,12 +34,14 @@ $(obj)/dtbs-list: $(dtb-y) FORCE
>  # Assembly file to wrap dtb(o)
>  # ---------------------------------------------------------------------------
> 
> +builtin-dtb-section = $(if $(filter arch/%, $(obj)),.dtb.init.rodata,.rodata)

I think we want to free the empty root dtb that's always builtin. That
is in drivers/of/ right? And I worry that an overlay could be in arch/
and then this breaks again. That's why it feels more correct to treat
dtbo.o vs. dtb.o differently. Perhaps we can check $(obj) for dtbo vs
dtb?

Also, modpost code looks for .init* named sections and treats them as
initdata already. Can we rename .dtb.init.rodata to .init.dtb.rodata so
that modpost can find that?