linux-kernel - Re: [PATCH v5 12/13] module: Move kdb

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Date:   Thu, 10 Feb 2022 14:05:57 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     "mcgrof@...nel.org" <mcgrof@...nel.org>,
        Aaron Tomlin <atomlin@...mlin.com>
CC:     "cl@...ux.com" <cl@...ux.com>,
        "pmladek@...e.com" <pmladek@...e.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>,
        "live-patching@...r.kernel.org" <live-patching@...r.kernel.org>,
        "atomlin@...mlin.com" <atomlin@...mlin.com>,
        "ghalat@...hat.com" <ghalat@...hat.com>,
        "allen.lkml@...il.com" <allen.lkml@...il.com>,
        "void@...ifault.com" <void@...ifault.com>,
        "joe@...ches.com" <joe@...ches.com>,
        "msuchanek@...e.de" <msuchanek@...e.de>,
        "oleksandr@...alenko.name" <oleksandr@...alenko.name>
Subject: Re: [PATCH v5 12/13] module: Move kdb_modules list out of core code



Le 09/02/2022 à 18:11, Aaron Tomlin a écrit :
> No functional change.
> 
> This patch migrates kdb_modules list to core kdb code
> since the list of added/or loaded modules is no longer
> private.
> 
> Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
> ---
>   kernel/debug/kdb/kdb_main.c | 5 +++++
>   kernel/module/internal.h    | 1 +
>   kernel/module/main.c        | 4 ----
>   3 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
> index 0852a537dad4..f101f5f078f4 100644
> --- a/kernel/debug/kdb/kdb_main.c
> +++ b/kernel/debug/kdb/kdb_main.c
> @@ -59,6 +59,11 @@ EXPORT_SYMBOL(kdb_grepping_flag);
>   int kdb_grep_leading;
>   int kdb_grep_trailing;
>   
> +#ifdef CONFIG_MODULES
> +extern struct list_head modules;

Should go in module.h

> +struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */

Should be static and should be removed from kernel/debug/kdb/kdb_private.h

> +#endif /* CONFIG_MODULES */
> +
>   /*
>    * Kernel debugger state flags
>    */
> diff --git a/kernel/module/internal.h b/kernel/module/internal.h
> index 52d30bf6d6b0..c49b4900b30b 100644
> --- a/kernel/module/internal.h
> +++ b/kernel/module/internal.h
> @@ -225,6 +225,7 @@ static int mod_sysfs_setup(struct module *mod,
>   {
>   	return 0;
>   }
> +

This should go in previous patch if needed (patch 11 sysfs)


>   static inline void mod_sysfs_fini(struct module *mod) { }
>   static inline void module_remove_modinfo_attrs(struct module *mod, int end) { }
>   static inline void del_usage_links(struct module *mod) { }
> diff --git a/kernel/module/main.c b/kernel/module/main.c
> index c2255954b7df..519c5335f7a6 100644
> --- a/kernel/module/main.c
> +++ b/kernel/module/main.c
> @@ -105,10 +105,6 @@ 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 */
> -#endif /* CONFIG_KGDB_KDB */
> -
>   static void module_assert_mutex_or_preempt(void)
>   {
>   #ifdef CONFIG_LOCKDEP