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From: Christoph Hellwig <hch@lst.de>
To: Frederic Barrat <fbarrat@linux.ibm.com>,
	Andrew Donnellan <ajd@linux.ibm.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Jessica Yu <jeyu@kernel.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Jiri Kosina <jikos@kernel.org>, Miroslav Benes <mbenes@suse.cz>,
	Petr Mladek <pmladek@suse.com>,
	Joe Lawrence <joe.lawrence@redhat.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>,
	Michal Marek <michal.lkml@markovi.net>,
	linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	dri-devel@lists.freedesktop.org, live-patching@vger.kernel.org,
	linux-kbuild@vger.kernel.org
Subject: [PATCH 06/13] kallsyms: only build {,module_}kallsyms_on_each_symbol when required
Date: Tue,  2 Feb 2021 13:13:27 +0100	[thread overview]
Message-ID: <20210202121334.1361503-7-hch@lst.de> (raw)
In-Reply-To: <20210202121334.1361503-1-hch@lst.de>

kallsyms_on_each_symbol and module_kallsyms_on_each_symbol are only used
by the livepatching code, so don't build them if livepatching is not
enabled.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/kallsyms.h | 17 ++++-------------
 include/linux/module.h   | 16 ++++------------
 kernel/kallsyms.c        |  2 ++
 kernel/module.c          |  2 ++
 4 files changed, 12 insertions(+), 25 deletions(-)

diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
index 481273f0c72d42..465060acc9816f 100644
--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -71,15 +71,14 @@ static inline void *dereference_symbol_descriptor(void *ptr)
 	return ptr;
 }
 
-#ifdef CONFIG_KALLSYMS
-/* Lookup the address for a symbol. Returns 0 if not found. */
-unsigned long kallsyms_lookup_name(const char *name);
-
-/* Call a function on each kallsyms symbol in the core kernel */
 int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
 				      unsigned long),
 			    void *data);
 
+#ifdef CONFIG_KALLSYMS
+/* Lookup the address for a symbol. Returns 0 if not found. */
+unsigned long kallsyms_lookup_name(const char *name);
+
 extern int kallsyms_lookup_size_offset(unsigned long addr,
 				  unsigned long *symbolsize,
 				  unsigned long *offset);
@@ -108,14 +107,6 @@ static inline unsigned long kallsyms_lookup_name(const char *name)
 	return 0;
 }
 
-static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *,
-						    struct module *,
-						    unsigned long),
-					  void *data)
-{
-	return 0;
-}
-
 static inline int kallsyms_lookup_size_offset(unsigned long addr,
 					      unsigned long *symbolsize,
 					      unsigned long *offset)
diff --git a/include/linux/module.h b/include/linux/module.h
index a64aa84d1b182c..3ea4ffae608f97 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -608,10 +608,6 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 /* Look for this name: can be of form module:name. */
 unsigned long module_kallsyms_lookup_name(const char *name);
 
-int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
-					     struct module *, unsigned long),
-				   void *data);
-
 extern void __noreturn __module_put_and_exit(struct module *mod,
 			long code);
 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
@@ -795,14 +791,6 @@ static inline unsigned long module_kallsyms_lookup_name(const char *name)
 	return 0;
 }
 
-static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
-							   struct module *,
-							   unsigned long),
-						 void *data)
-{
-	return 0;
-}
-
 static inline int register_module_notifier(struct notifier_block *nb)
 {
 	/* no events will happen anyway, so this can always succeed */
@@ -891,4 +879,8 @@ static inline bool module_sig_ok(struct module *module)
 }
 #endif	/* CONFIG_MODULE_SIG */
 
+int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
+					     struct module *, unsigned long),
+				   void *data);
+
 #endif /* _LINUX_MODULE_H */
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index a0d3f0865916f9..8043a90aa50ed3 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -177,6 +177,7 @@ unsigned long kallsyms_lookup_name(const char *name)
 	return module_kallsyms_lookup_name(name);
 }
 
+#ifdef CONFIG_LIVEPATCH
 /*
  * Iterate over all symbols in vmlinux.  For symbols from modules use
  * module_kallsyms_on_each_symbol instead.
@@ -198,6 +199,7 @@ int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
 	}
 	return 0;
 }
+#endif /* CONFIG_LIVEPATCH */
 
 static unsigned long get_symbol_pos(unsigned long addr,
 				    unsigned long *symbolsize,
diff --git a/kernel/module.c b/kernel/module.c
index 25345792c770d1..470fd9d9d68f97 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -4366,6 +4366,7 @@ unsigned long module_kallsyms_lookup_name(const char *name)
 	return ret;
 }
 
+#ifdef CONFIG_LIVEPATCH
 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 					     struct module *, unsigned long),
 				   void *data)
@@ -4396,6 +4397,7 @@ int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 	mutex_unlock(&module_mutex);
 	return ret;
 }
+#endif /* CONFIG_LIVEPATCH */
 #endif /* CONFIG_KALLSYMS */
 
 /* Maximum number of characters written by module_flags() */
-- 
2.29.2


WARNING: multiple messages have this Message-ID
From: Christoph Hellwig <hch@lst.de>
To: Frederic Barrat <fbarrat@linux.ibm.com>,
	Andrew Donnellan <ajd@linux.ibm.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Jessica Yu <jeyu@kernel.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Jiri Kosina <jikos@kernel.org>, Miroslav Benes <mbenes@suse.cz>,
	Petr Mladek <pmladek@suse.com>,
	Joe Lawrence <joe.lawrence@redhat.com>
Cc: Michal Marek <michal.lkml@markovi.net>,
	linux-kbuild@vger.kernel.org,
	Masahiro Yamada <masahiroy@kernel.org>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	live-patching@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 06/13] kallsyms: only build {, module_}kallsyms_on_each_symbol when required
Date: Tue,  2 Feb 2021 13:13:27 +0100	[thread overview]
Message-ID: <20210202121334.1361503-7-hch@lst.de> (raw)
In-Reply-To: <20210202121334.1361503-1-hch@lst.de>

kallsyms_on_each_symbol and module_kallsyms_on_each_symbol are only used
by the livepatching code, so don't build them if livepatching is not
enabled.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/kallsyms.h | 17 ++++-------------
 include/linux/module.h   | 16 ++++------------
 kernel/kallsyms.c        |  2 ++
 kernel/module.c          |  2 ++
 4 files changed, 12 insertions(+), 25 deletions(-)

diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
index 481273f0c72d42..465060acc9816f 100644
--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -71,15 +71,14 @@ static inline void *dereference_symbol_descriptor(void *ptr)
 	return ptr;
 }
 
-#ifdef CONFIG_KALLSYMS
-/* Lookup the address for a symbol. Returns 0 if not found. */
-unsigned long kallsyms_lookup_name(const char *name);
-
-/* Call a function on each kallsyms symbol in the core kernel */
 int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
 				      unsigned long),
 			    void *data);
 
+#ifdef CONFIG_KALLSYMS
+/* Lookup the address for a symbol. Returns 0 if not found. */
+unsigned long kallsyms_lookup_name(const char *name);
+
 extern int kallsyms_lookup_size_offset(unsigned long addr,
 				  unsigned long *symbolsize,
 				  unsigned long *offset);
@@ -108,14 +107,6 @@ static inline unsigned long kallsyms_lookup_name(const char *name)
 	return 0;
 }
 
-static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *,
-						    struct module *,
-						    unsigned long),
-					  void *data)
-{
-	return 0;
-}
-
 static inline int kallsyms_lookup_size_offset(unsigned long addr,
 					      unsigned long *symbolsize,
 					      unsigned long *offset)
diff --git a/include/linux/module.h b/include/linux/module.h
index a64aa84d1b182c..3ea4ffae608f97 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -608,10 +608,6 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 /* Look for this name: can be of form module:name. */
 unsigned long module_kallsyms_lookup_name(const char *name);
 
-int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
-					     struct module *, unsigned long),
-				   void *data);
-
 extern void __noreturn __module_put_and_exit(struct module *mod,
 			long code);
 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
@@ -795,14 +791,6 @@ static inline unsigned long module_kallsyms_lookup_name(const char *name)
 	return 0;
 }
 
-static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
-							   struct module *,
-							   unsigned long),
-						 void *data)
-{
-	return 0;
-}
-
 static inline int register_module_notifier(struct notifier_block *nb)
 {
 	/* no events will happen anyway, so this can always succeed */
@@ -891,4 +879,8 @@ static inline bool module_sig_ok(struct module *module)
 }
 #endif	/* CONFIG_MODULE_SIG */
 
+int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
+					     struct module *, unsigned long),
+				   void *data);
+
 #endif /* _LINUX_MODULE_H */
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index a0d3f0865916f9..8043a90aa50ed3 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -177,6 +177,7 @@ unsigned long kallsyms_lookup_name(const char *name)
 	return module_kallsyms_lookup_name(name);
 }
 
+#ifdef CONFIG_LIVEPATCH
 /*
  * Iterate over all symbols in vmlinux.  For symbols from modules use
  * module_kallsyms_on_each_symbol instead.
@@ -198,6 +199,7 @@ int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
 	}
 	return 0;
 }
+#endif /* CONFIG_LIVEPATCH */
 
 static unsigned long get_symbol_pos(unsigned long addr,
 				    unsigned long *symbolsize,
diff --git a/kernel/module.c b/kernel/module.c
index 25345792c770d1..470fd9d9d68f97 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -4366,6 +4366,7 @@ unsigned long module_kallsyms_lookup_name(const char *name)
 	return ret;
 }
 
+#ifdef CONFIG_LIVEPATCH
 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 					     struct module *, unsigned long),
 				   void *data)
@@ -4396,6 +4397,7 @@ int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 	mutex_unlock(&module_mutex);
 	return ret;
 }
+#endif /* CONFIG_LIVEPATCH */
 #endif /* CONFIG_KALLSYMS */
 
 /* Maximum number of characters written by module_flags() */
-- 
2.29.2


  parent reply	other threads:[~2021-02-02 12:15 UTC|newest]

Thread overview: 79+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-02 12:13 module loader dead code removal and cleanups v3 Christoph Hellwig
2021-02-02 12:13 ` [PATCH 01/13] powerpc/powernv: remove get_cxl_module Christoph Hellwig
2021-02-04 10:44   ` Michael Ellerman
2021-02-02 12:13 ` [PATCH 02/13] drm: remove drm_fb_helper_modinit Christoph Hellwig
2021-02-02 12:13 ` [PATCH 03/13] module: unexport find_module and module_mutex Christoph Hellwig
2021-02-02 12:13 ` [PATCH 04/13] module: use RCU to synchronize find_module Christoph Hellwig
2021-02-02 12:13 ` [PATCH 05/13] kallsyms: refactor {,module_}kallsyms_on_each_symbol Christoph Hellwig
2021-02-03  8:58   ` Petr Mladek
2021-02-02 12:13 ` Christoph Hellwig [this message]
2021-02-02 14:03   ` [PATCH 06/13] kallsyms: only build {, module_}kallsyms_on_each_symbol when required Miroslav Benes
2021-02-02 12:13 ` [PATCH 07/13] module: mark module_mutex static Christoph Hellwig
2021-02-02 14:04   ` Miroslav Benes
2021-02-02 12:13 ` [PATCH 08/13] module: remove each_symbol_in_section Christoph Hellwig
2021-02-02 14:04   ` Miroslav Benes
2021-02-02 12:13 ` [PATCH 09/13] module: merge each_symbol_section into find_symbol Christoph Hellwig
2021-02-02 14:04   ` Miroslav Benes
2021-02-02 12:13 ` [PATCH 10/13] module: pass struct find_symbol_args to find_symbol Christoph Hellwig
2021-02-02 14:07   ` Miroslav Benes
2021-02-02 15:41     ` Christoph Hellwig
2021-02-03  9:04     ` Christoph Hellwig
2021-02-03  9:31       ` Miroslav Benes
2021-02-02 12:13 ` [PATCH 11/13] module: move struct symsearch to module.c Christoph Hellwig
2021-02-02 14:10   ` Miroslav Benes
2021-02-02 12:13 ` [PATCH 12/13] module: remove EXPORT_SYMBOL_GPL_FUTURE Christoph Hellwig
2021-02-02 14:12   ` Miroslav Benes
2021-02-02 12:13 ` [PATCH 13/13] module: remove EXPORT_UNUSED_SYMBOL* Christoph Hellwig
2021-02-02 14:21   ` Miroslav Benes
2021-02-02 14:37 ` module loader dead code removal and cleanups v3 Jessica Yu
2021-02-02 15:23   ` Christoph Hellwig
2021-02-02 17:38   ` Emil Velikov
2021-02-08 11:36 ` Jessica Yu
  -- strict thread matches above, loose matches on Subject: below --
2021-01-28 18:14 module loader dead code removal and cleanups v2 Christoph Hellwig
2021-01-28 18:14 ` [PATCH 06/13] kallsyms: only build {, module_}kallsyms_on_each_symbol when required Christoph Hellwig
2021-01-21  7:49 module loader dead code removal and cleanusp Christoph Hellwig
2021-01-21  7:49 ` [PATCH 06/13] kallsyms: only build {, module_}kallsyms_on_each_symbol when required Christoph Hellwig

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