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Message-ID: <CAPDyKFp1s+Xvg5bE3J9GV6gkLB0vKDd1YdVdMPW-+vpAqiKcjA@mail.gmail.com>
Date: Wed, 19 Jan 2022 11:54:54 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: rjw@...ysocki.net, robh@...nel.org, lukasz.luba@....com,
heiko@...ech.de, arnd@...aro.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org,
Daniel Lezcano <daniel.lezcano@...nel.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Arnd Bergmann <arnd@...db.de>,
"open list:GENERIC INCLUDE/ASM HEADER FILES"
<linux-arch@...r.kernel.org>
Subject: Re: [PATCH v6 1/5] powercap/drivers/dtpm: Convert the init table
section to a simple array
On Wed, 19 Jan 2022 at 09:57, Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>
> The init table section is freed after the system booted. However the
> next changes will make per module the DTPM description, so the table
> won't be accessible when the module is loaded.
>
> In order to fix that, we should move the table to the data section
> where there are very few entries and that makes strange to add it
> there.
>
> The main goal of the table was to keep self-encapsulated code and we
> can keep it almost as it by using an array instead.
>
> Suggested-by: Ulf Hansson <ulf.hansson@...aro.org>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Thanks for updating!
Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
Kind regards
Uffe
> ---
> drivers/powercap/dtpm.c | 2 ++
> drivers/powercap/dtpm_cpu.c | 5 ++++-
> drivers/powercap/dtpm_subsys.h | 18 ++++++++++++++++++
> include/asm-generic/vmlinux.lds.h | 11 -----------
> include/linux/dtpm.h | 24 +++---------------------
> 5 files changed, 27 insertions(+), 33 deletions(-)
> create mode 100644 drivers/powercap/dtpm_subsys.h
>
> diff --git a/drivers/powercap/dtpm.c b/drivers/powercap/dtpm.c
> index 8cb45f2d3d78..0e5c93443c70 100644
> --- a/drivers/powercap/dtpm.c
> +++ b/drivers/powercap/dtpm.c
> @@ -24,6 +24,8 @@
> #include <linux/slab.h>
> #include <linux/mutex.h>
>
> +#include "dtpm_subsys.h"
> +
> #define DTPM_POWER_LIMIT_FLAG 0
>
> static const char *constraint_name[] = {
> diff --git a/drivers/powercap/dtpm_cpu.c b/drivers/powercap/dtpm_cpu.c
> index b740866b228d..5763e0ce2af5 100644
> --- a/drivers/powercap/dtpm_cpu.c
> +++ b/drivers/powercap/dtpm_cpu.c
> @@ -269,4 +269,7 @@ static int __init dtpm_cpu_init(void)
> return 0;
> }
>
> -DTPM_DECLARE(dtpm_cpu, dtpm_cpu_init);
> +struct dtpm_subsys_ops dtpm_cpu_ops = {
> + .name = KBUILD_MODNAME,
> + .init = dtpm_cpu_init,
> +};
> diff --git a/drivers/powercap/dtpm_subsys.h b/drivers/powercap/dtpm_subsys.h
> new file mode 100644
> index 000000000000..2a3a2055f60e
> --- /dev/null
> +++ b/drivers/powercap/dtpm_subsys.h
> @@ -0,0 +1,18 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (C) 2022 Linaro Ltd
> + *
> + * Author: Daniel Lezcano <daniel.lezcano@...aro.org>
> + */
> +#ifndef ___DTPM_SUBSYS_H__
> +#define ___DTPM_SUBSYS_H__
> +
> +extern struct dtpm_subsys_ops dtpm_cpu_ops;
> +
> +struct dtpm_subsys_ops *dtpm_subsys[] = {
> +#ifdef CONFIG_DTPM_CPU
> + &dtpm_cpu_ops,
> +#endif
> +};
> +
> +#endif
> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index 42f3866bca69..2a10db2f0bc5 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -321,16 +321,6 @@
> #define THERMAL_TABLE(name)
> #endif
>
> -#ifdef CONFIG_DTPM
> -#define DTPM_TABLE() \
> - . = ALIGN(8); \
> - __dtpm_table = .; \
> - KEEP(*(__dtpm_table)) \
> - __dtpm_table_end = .;
> -#else
> -#define DTPM_TABLE()
> -#endif
> -
> #define KERNEL_DTB() \
> STRUCT_ALIGN(); \
> __dtb_start = .; \
> @@ -723,7 +713,6 @@
> ACPI_PROBE_TABLE(irqchip) \
> ACPI_PROBE_TABLE(timer) \
> THERMAL_TABLE(governor) \
> - DTPM_TABLE() \
> EARLYCON_TABLE() \
> LSM_TABLE() \
> EARLY_LSM_TABLE() \
> diff --git a/include/linux/dtpm.h b/include/linux/dtpm.h
> index d37e5d06a357..506048158a50 100644
> --- a/include/linux/dtpm.h
> +++ b/include/linux/dtpm.h
> @@ -32,29 +32,11 @@ struct dtpm_ops {
> void (*release)(struct dtpm *);
> };
>
> -typedef int (*dtpm_init_t)(void);
> -
> -struct dtpm_descr {
> - dtpm_init_t init;
> +struct dtpm_subsys_ops {
> + const char *name;
> + int (*init)(void);
> };
>
> -/* Init section thermal table */
> -extern struct dtpm_descr __dtpm_table[];
> -extern struct dtpm_descr __dtpm_table_end[];
> -
> -#define DTPM_TABLE_ENTRY(name, __init) \
> - static struct dtpm_descr __dtpm_table_entry_##name \
> - __used __section("__dtpm_table") = { \
> - .init = __init, \
> - }
> -
> -#define DTPM_DECLARE(name, init) DTPM_TABLE_ENTRY(name, init)
> -
> -#define for_each_dtpm_table(__dtpm) \
> - for (__dtpm = __dtpm_table; \
> - __dtpm < __dtpm_table_end; \
> - __dtpm++)
> -
> static inline struct dtpm *to_dtpm(struct powercap_zone *zone)
> {
> return container_of(zone, struct dtpm, zone);
> --
> 2.25.1
>
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