linux-kernel - [RFC PATCH v2 3/6] module: s390: keep mod_arch

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Message-Id: <1448943679-3412-4-git-send-email-jeyu@redhat.com>
Date:	Mon, 30 Nov 2015 23:21:16 -0500
From:	Jessica Yu <jeyu@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Jonathan Corbet <corbet@....net>,
	Miroslav Benes <mbenes@...e.cz>
Cc:	linux-api@...r.kernel.org, live-patching@...r.kernel.org,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [RFC PATCH v2 3/6] module: s390: keep mod_arch_specific for livepatch modules

Livepatch needs to utilize the symbol information contained in the
mod_arch_specific struct in order to be able to call the s390
apply_relocate_add() function to apply relocations. Remove the redundant
vfree() in module_finalize() since module_arch_freeing_init() (which also frees
said structures) is called in do_init_module(). Keep a reference to syminfo if
the module is a livepatch module and free the structures in
module_arch_cleanup(). If the module isn't a livepatch module, we free the
structures in module_arch_freeing_init() as usual.

Signed-off-by: Jessica Yu <jeyu@...hat.com>
---
 arch/s390/kernel/module.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
index 0c1a679..17a1979 100644
--- a/arch/s390/kernel/module.c
+++ b/arch/s390/kernel/module.c
@@ -51,6 +51,9 @@ void *module_alloc(unsigned long size)
 
 void module_arch_freeing_init(struct module *mod)
 {
+	if (mod->klp)
+		return;
+
 	vfree(mod->arch.syminfo);
 	mod->arch.syminfo = NULL;
 }
@@ -420,12 +423,18 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
 	return 0;
 }
 
+void module_arch_cleanup(struct module *mod)
+{
+	if (mod->klp) {
+		vfree(mod->arch.syminfo);
+		mod->arch.syminfo = NULL;
+	}
+}
+
 int module_finalize(const Elf_Ehdr *hdr,
 		    const Elf_Shdr *sechdrs,
 		    struct module *me)
 {
 	jump_label_apply_nops(me);
-	vfree(me->arch.syminfo);
-	me->arch.syminfo = NULL;
 	return 0;
 }
-- 
2.4.3

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