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

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Date:   Tue, 28 Apr 2020 20:56:40 +0200
From:   Jessica Yu <jeyu@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
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()

+++ Josh Poimboeuf [28/04/20 12:03 -0500]:
>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) {}

Missing static here, but otherwise looks good. Thanks!

> 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
>