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Date: Tue, 8 Mar 2022 08:36:59 +0000
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Aaron Tomlin <atomlin@...hat.com>,
"mcgrof@...nel.org" <mcgrof@...nel.org>
CC: "cl@...ux.com" <cl@...ux.com>, "mbenes@...e.cz" <mbenes@...e.cz>,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"jeyu@...nel.org" <jeyu@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
"void@...ifault.com" <void@...ifault.com>,
"atomlin@...mlin.com" <atomlin@...mlin.com>,
"allen.lkml@...il.com" <allen.lkml@...il.com>,
"joe@...ches.com" <joe@...ches.com>,
"msuchanek@...e.de" <msuchanek@...e.de>,
"oleksandr@...alenko.name" <oleksandr@...alenko.name>,
"jason.wessel@...driver.com" <jason.wessel@...driver.com>,
"daniel.thompson@...aro.org" <daniel.thompson@...aro.org>,
"hch@...radead.org" <hch@...radead.org>,
"pmladek@...e.com" <pmladek@...e.com>
Subject: Re: [PATCH v10 13/14] module: Move kdb module related code out of
main kdb code
Le 07/03/2022 à 18:47, Aaron Tomlin a écrit :
> No functional change.
>
> This patch migrates the kdb 'lsmod' command support out of main
> kdb code into its own file under kernel/module. In addition to
> the above, a minor style warning i.e. missing a blank line after
> declarations, was resolved too. The new file was added to
> MAINTAINERS.
>
> Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
> ---
> MAINTAINERS | 1 +
> include/linux/kdb.h | 1 +
> kernel/debug/kdb/kdb_main.c | 49 ---------------------------------
> kernel/module/Makefile | 1 +
> kernel/module/kdb.c | 55 +++++++++++++++++++++++++++++++++++++
> kernel/module/main.c | 4 ---
> 6 files changed, 58 insertions(+), 53 deletions(-)
> create mode 100644 kernel/module/kdb.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 195cf1ac2ee8..40c717f93c1a 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -10689,6 +10689,7 @@ F: drivers/tty/serial/kgdboc.c
> F: include/linux/kdb.h
> F: include/linux/kgdb.h
> F: kernel/debug/
> +F: kernel/module/kdb.c
>
> KHADAS MCU MFD DRIVER
> M: Neil Armstrong <narmstrong@...libre.com>
> diff --git a/include/linux/kdb.h b/include/linux/kdb.h
> index ea0f5e580fac..07dfb6a20a1c 100644
> --- a/include/linux/kdb.h
> +++ b/include/linux/kdb.h
> @@ -222,5 +222,6 @@ enum {
>
> extern int kdbgetintenv(const char *, int *);
> extern int kdb_set(int, const char **);
> +int kdb_lsmod(int argc, const char **argv);
>
> #endif /* !_KDB_H */
> diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
> index 0852a537dad4..f3a30cd5037f 100644
> --- a/kernel/debug/kdb/kdb_main.c
> +++ b/kernel/debug/kdb/kdb_main.c
> @@ -26,7 +26,6 @@
> #include <linux/utsname.h>
> #include <linux/vmalloc.h>
> #include <linux/atomic.h>
> -#include <linux/module.h>
> #include <linux/moduleparam.h>
> #include <linux/mm.h>
> #include <linux/init.h>
No need of linux/module.h here anymore ?
In that case, I see several other files in kernel/debug/kdb/ that
include linux/module.h
Should it be removed in those files as well ?
> diff --git a/kernel/module/Makefile b/kernel/module/Makefile
> index cf8dcdc6b55f..88f5cdcdb067 100644
> --- a/kernel/module/Makefile
> +++ b/kernel/module/Makefile
> @@ -17,3 +17,4 @@ obj-$(CONFIG_DEBUG_KMEMLEAK) += debug_kmemleak.o
> obj-$(CONFIG_KALLSYMS) += kallsyms.o
> obj-$(CONFIG_PROC_FS) += procfs.o
> obj-$(CONFIG_SYSFS) += sysfs.o
> +obj-$(CONFIG_KGDB_KDB) += kdb.o
> diff --git a/kernel/module/kdb.c b/kernel/module/kdb.c
> new file mode 100644
> index 000000000000..60baeebea3e0
> --- /dev/null
> +++ b/kernel/module/kdb.c
> @@ -0,0 +1,55 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Module kdb support
> + *
> + * Copyright (C) 2010 Jason Wessel
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kdb.h>
> +#include "internal.h"
> +
> +/*
> + * kdb_lsmod - This function implements the 'lsmod' command. Lists
> + * currently loaded kernel modules.
> + * Mostly taken from userland lsmod.
> + */
> +int kdb_lsmod(int argc, const char **argv)
> +{
> + struct module *mod;
> +
> + if (argc != 0)
> + return KDB_ARGCOUNT;
> +
> + kdb_printf("Module Size modstruct Used by\n");
> + list_for_each_entry(mod, &modules, list) {
> + if (mod->state == MODULE_STATE_UNFORMED)
> + continue;
> +
> + kdb_printf("%-20s%8u 0x%px ", mod->name,
> + mod->core_layout.size, (void *)mod);
> +#ifdef CONFIG_MODULE_UNLOAD
> + kdb_printf("%4d ", module_refcount(mod));
> +#endif
> + if (mod->state == MODULE_STATE_GOING)
> + kdb_printf(" (Unloading)");
> + else if (mod->state == MODULE_STATE_COMING)
> + kdb_printf(" (Loading)");
> + else
> + kdb_printf(" (Live)");
> + kdb_printf(" 0x%px", mod->core_layout.base);
> +
> +#ifdef CONFIG_MODULE_UNLOAD
> + {
> + struct module_use *use;
> + kdb_printf(" [ ");
> + list_for_each_entry(use, &mod->source_list,
> + source_list)
> + kdb_printf("%s ", use->target->name);
> + kdb_printf("]\n");
> + }
> +#endif
That's a ugly construct. Could it be a function instead that you call
from this loop,
Something like:
static void lsmod_in_use(struct module *mod)
{
#ifdef CONFIG_MODULE_UNLOAD
struct module_use *use;
kdb_printf(" [ ");
list_for_each_entry(use, &mod->source_list,
source_list)
kdb_printf("%s ", use->target->name);
kdb_printf("]\n");
#endif
}
> + }
> +
> + return 0;
> +}
> diff --git a/kernel/module/main.c b/kernel/module/main.c
> index b8a59b5c3e3a..bcc4f7a82649 100644
> --- a/kernel/module/main.c
> +++ b/kernel/module/main.c
> @@ -108,10 +108,6 @@ static void mod_update_bounds(struct module *mod)
> __mod_update_bounds(mod->init_layout.base, mod->init_layout.size);
> }
>
> -#ifdef CONFIG_KGDB_KDB
> -struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
It should be removed from kernel/debug/kdb/kdb_private.h as well.
> -#endif /* CONFIG_KGDB_KDB */
> -
> static void module_assert_mutex_or_preempt(void)
> {
> #ifdef CONFIG_LOCKDEP
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