linux-kernel - Re: [PATCH v3 09/10] module: Remove module_disable

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Message-ID: <20200428170309.xrsmqdwj5qu2q6t6@treble>
Date:   Tue, 28 Apr 2020 12:03:09 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Jessica Yu <jeyu@...nel.org>
Cc:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Joe Lawrence <joe.lawrence@...hat.com>
Subject: Re: [PATCH v3 09/10] module: Remove module_disable_ro()

On Tue, Apr 28, 2020 at 06:41:55PM +0200, Jessica Yu wrote:
> +++ Josh Poimboeuf [28/04/20 11:36 -0500]:
> > On Tue, Apr 28, 2020 at 06:25:05PM +0200, Jessica Yu wrote:
> > > +++ Josh Poimboeuf [25/04/20 06:07 -0500]:
> > > > module_disable_ro() has no more users.  Remove it.
> > > >
> > > > Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> > > > Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > > 
> > > Hm, I guess this means we can also remove the module_enable_ro() stubs
> > > in module.h and make it a static function again (like the other
> > > module_enable_* functions) as there are no more outside users. I have to
> > > remind myself after this patchset is merged :-)
> > 
> > Ah, true.  I'm respinning the patch set anyway, I can just add this as a
> > another patch.
> 
> That would be great. Thanks!

Sneak preview:

From: Josh Poimboeuf <jpoimboe@...hat.com>
Subject: [PATCH] module: Make module_enable_ro() static again

Now that module_enable_ro() has no more external users, make it static
again.

Suggested-by: Jessica Yu <jeyu@...nel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 include/linux/module.h | 6 ------
 kernel/module.c        | 4 ++--
 2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/include/linux/module.h b/include/linux/module.h
index e4ef7b36feda..2c2e988bcf10 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -858,12 +858,6 @@ extern int module_sysfs_initialized;
 
 #define __MODULE_STRING(x) __stringify(x)
 
-#ifdef CONFIG_STRICT_MODULE_RWX
-extern void module_enable_ro(const struct module *mod, bool after_init);
-#else
-static inline void module_enable_ro(const struct module *mod, bool after_init) { }
-#endif
-
 #ifdef CONFIG_GENERIC_BUG
 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
 			 struct module *);
diff --git a/kernel/module.c b/kernel/module.c
index f0e414a01d91..6d8aab60943e 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2016,7 +2016,7 @@ static void frob_writable_data(const struct module_layout *layout,
 		   (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT);
 }
 
-void module_enable_ro(const struct module *mod, bool after_init)
+static void module_enable_ro(const struct module *mod, bool after_init)
 {
 	if (!rodata_enabled)
 		return;
@@ -2057,7 +2057,7 @@ static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
 }
 
 #else /* !CONFIG_STRICT_MODULE_RWX */
-/* module_{enable,disable}_ro() stubs are in module.h */
+void module_enable_ro(const struct module *mod, bool after_init) {}
 static void module_enable_nx(const struct module *mod) { }
 static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
 				       char *secstrings, struct module *mod)
-- 
2.21.1