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

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Message-ID: <12d0909b1612fb6d2caa42b4fda5e5ae63d623a3.1724159867.git.andrea.porta@suse.com>
Date: Tue, 20 Aug 2024 16:36:07 +0200
From: Andrea della Porta <andrea.porta@...e.com>
To: Andrea della Porta <andrea.porta@...e.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Saravana Kannan <saravanak@...gle.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-pci@...r.kernel.org,
	linux-arch@...r.kernel.org,
	Lee Jones <lee@...nel.org>,
	Andrew Lunn <andrew@...n.ch>,
	Stefan Wahren <wahrenst@....net>
Subject: [PATCH 05/11] vmlinux.lds.h: Preserve DTB sections from being discarded after init

The special section .dtb.init.rodata contains dtb and dtbo compiled
as objects inside the kernel and ends up in .init.data sectiion that
will be discarded early after the init phase. This is a problem for
builtin drivers that apply dtb overlay at runtime since this happens
later (e.g. during bus enumeration) and also for modules that should
be able to do it dynamically during runtime.
Move the dtb section to .data.

Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
---
 include/asm-generic/vmlinux.lds.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index ad6afc5c4918..3ae9097774b0 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -365,6 +365,7 @@
 	TRACE_PRINTKS()							\
 	BPF_RAW_TP()							\
 	TRACEPOINT_STR()						\
+	KERNEL_DTB()							\
 	KUNIT_TABLE()
 
 /*
@@ -683,7 +684,6 @@
 	TIMER_OF_TABLES()						\
 	CPU_METHOD_OF_TABLES()						\
 	CPUIDLE_METHOD_OF_TABLES()					\
-	KERNEL_DTB()							\
 	IRQCHIP_OF_MATCH_TABLE()					\
 	ACPI_PROBE_TABLE(irqchip)					\
 	ACPI_PROBE_TABLE(timer)						\
-- 
2.35.3