linux-kernel - [PATCH v5 1/6] powercap/drivers/dtpm: Move dtpm table from init to data section

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Message-Id: <20211218130014.4037640-2-daniel.lezcano@linaro.org>
Date:   Sat, 18 Dec 2021 14:00:09 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     daniel.lezcano@...aro.org, rjw@...ysocki.net
Cc:     lukasz.luba@....com, robh@...nel.org, heiko@...ech.de,
        arnd@...aro.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, ulf.hansson@...aro.org,
        Arnd Bergmann <arnd@...db.de>,
        linux-arch@...r.kernel.org (open list:GENERIC INCLUDE/ASM HEADER FILES)
Subject: [PATCH v5 1/6] powercap/drivers/dtpm: Move dtpm table from init to data section

The dtpm table is used to let the different dtpm backends to register
their setup callbacks in a single place and preventing to export
multiple functions all around the kernel. That allows the dtpm code to
be self-encapsulated.

The dtpm hierarchy will be passed as a parameter by a platform
specific code and that will lead to the creation of the different dtpm
nodes.

The function creating the hierarchy could be called from a module at
init time or when it is loaded. However, at this moment the table is
already freed as it belongs to the init section and the creation will
lead to a invalid memory access.

Fix this by moving the table to the data section.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 include/asm-generic/vmlinux.lds.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 42f3866bca69..50d494d94d6c 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -362,7 +362,8 @@
 	BRANCH_PROFILE()						\
 	TRACE_PRINTKS()							\
 	BPF_RAW_TP()							\
-	TRACEPOINT_STR()
+	TRACEPOINT_STR()						\
+	DTPM_TABLE()

 /*
  * Data section helpers
@@ -723,7 +724,6 @@
 	ACPI_PROBE_TABLE(irqchip)					\
 	ACPI_PROBE_TABLE(timer)						\
 	THERMAL_TABLE(governor)						\
-	DTPM_TABLE()							\
 	EARLYCON_TABLE()						\
 	LSM_TABLE()							\
 	EARLY_LSM_TABLE()						\
-- 
2.25.1