linux-kernel - Re: [PATCH 2/7] modules: mark find

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Date:   Wed, 29 Jul 2020 18:13:18 +0200
From:   Jessica Yu <jeyu@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>,
        live-patching@...r.kernel.org
Subject: Re: [PATCH 2/7] modules: mark find_symbol static

+++ Christoph Hellwig [29/07/20 08:27 +0200]:
>find_symbol is only used in module.c.
>
>Signed-off-by: Christoph Hellwig <hch@....de>

CCing the livepatching ML, as this may or may not impact its users.

AFAIK, the out-of-tree kpatch module had used find_symbol() in the
past, I am not sure what its current status is. I suspect all of its
functionality has been migrated to upstream livepatch already.

>---
> include/linux/module.h | 11 -----------
> kernel/module.c        |  3 +--
> 2 files changed, 1 insertion(+), 13 deletions(-)
>
>diff --git a/include/linux/module.h b/include/linux/module.h
>index f1fdbeef2153a8..90bdc362be3681 100644
>--- a/include/linux/module.h
>+++ b/include/linux/module.h
>@@ -590,17 +590,6 @@ struct symsearch {
> 	bool unused;
> };
>
>-/*
>- * Search for an exported symbol by name.
>- *
>- * Must be called with module_mutex held or preemption disabled.
>- */
>-const struct kernel_symbol *find_symbol(const char *name,
>-					struct module **owner,
>-					const s32 **crc,
>-					bool gplok,
>-					bool warn);
>-
> /*
>  * Walk the exported symbol table
>  *
>diff --git a/kernel/module.c b/kernel/module.c
>index 17d64dae756c80..84da96a6d8241c 100644
>--- a/kernel/module.c
>+++ b/kernel/module.c
>@@ -585,7 +585,7 @@ static bool find_exported_symbol_in_section(const struct symsearch *syms,
>
> /* Find an exported symbol and return it, along with, (optional) crc and
>  * (optional) module which owns it.  Needs preempt disabled or module_mutex. */
>-const struct kernel_symbol *find_symbol(const char *name,
>+static const struct kernel_symbol *find_symbol(const char *name,
> 					struct module **owner,
> 					const s32 **crc,
> 					bool gplok,
>@@ -608,7 +608,6 @@ const struct kernel_symbol *find_symbol(const char *name,
> 	pr_debug("Failed to find symbol %s\n", name);
> 	return NULL;
> }
>-EXPORT_SYMBOL_GPL(find_symbol);
>
> /*
>  * Search for module by name: must hold module_mutex (or preempt disabled
>-- 
>2.27.0
>