[PATCH 0/1] Constify struct lock_manager_operations for 2.6.32-git-053fe57ac v2

[PATCH 0/1] Constify struct lock_manager_operations for 2.6.32-git-053fe57ac v2

[re.emese]

From: Emese Revfy <re.emese@gmail.com>

Hello everyone!

The following patch series attempts to constify several structures
that hold function pointers. This is only the initial batch, there
are about over 150 candidate structures, some of which can be
constified as well, I plan to submit them in the future.

The list of constified structures in this series (* marks this thread):
acpi_dock_ops
address_space_operations
backlight_ops
block_device_operations
dma_map_ops
extent_io_ops
file_lock_operations
file_operations
hv_ops
intel_dvo_dev_ops
item_operations
iwl_ops
kgdb_arch
kgdb_io
kset_uevent_ops
* lock_manager_operations
microcode_ops
mtrr_ops
neigh_ops
nlmsvc_binding
pci_raw_ops
platform_hibernation_ops
platform_suspend_ops
snd_ac97_build_ops
sysfs_ops
usb_mon_operations
wd_ops

There are certain exceptions where a given instance of the structure
cannot be const, they are marked with a comment in the patch.

The patches compile fine with an allyesconfig kernel on i386 and x86_64.

Please let me know if any of these structures should not be constified
and any other issues you see with them.


Changelog:
----------
v1 -> v2
	- updated to linus-git-053fe57
	- extended comments with a reference to code that prevents constification
	- split up patches by subsystem as suggested by Greg KH, Jiri Slaby
	- added all Acked-by's received so far
	- removed patch for super_operations for now
	- removed patch for ptmx_fops

Thanks,
   Emese

 include/linux/fs.h |   16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

[PATCH 1/1] Constify struct lock_manager_operations for 2.6.32-git-053fe57ac v2

[re.emese]

From: Emese Revfy <re.emese@gmail.com>


Signed-off-by: Emese Revfy <re.emese@gmail.com>
---
 include/linux/fs.h |   16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index a057f48..ea774a3 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1033,14 +1033,14 @@ struct file_lock_operations {
 };
 
 struct lock_manager_operations {
-	int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
-	void (*fl_notify)(struct file_lock *);	/* unblock callback */
-	int (*fl_grant)(struct file_lock *, struct file_lock *, int);
-	void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
-	void (*fl_release_private)(struct file_lock *);
-	void (*fl_break)(struct file_lock *);
-	int (*fl_mylease)(struct file_lock *, struct file_lock *);
-	int (*fl_change)(struct file_lock **, int);
+	int (* const fl_compare_owner)(struct file_lock *, struct file_lock *);
+	void (* const fl_notify)(struct file_lock *);	/* unblock callback */
+	int (* const fl_grant)(struct file_lock *, struct file_lock *, int);
+	void (* const fl_copy_lock)(struct file_lock *, struct file_lock *);
+	void (* const fl_release_private)(struct file_lock *);
+	void (* const fl_break)(struct file_lock *);
+	int (* const fl_mylease)(struct file_lock *, struct file_lock *);
+	int (* const fl_change)(struct file_lock **, int);
 };
 
 struct lock_manager {
-- 
1.6.5.3

[PATCH 1/1] Constify struct microcode_ops for 2.6.32-git-053fe57ac v2

[re.emese]

From: Emese Revfy <re.emese@gmail.com>


Signed-off-by: Emese Revfy <re.emese@gmail.com>
---
 arch/x86/include/asm/microcode.h  |   22 +++++++++++-----------
 arch/x86/kernel/microcode_amd.c   |    4 ++--
 arch/x86/kernel/microcode_core.c  |    2 +-
 arch/x86/kernel/microcode_intel.c |    4 ++--
 4 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index c24ca9a..f0b99e6 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -12,15 +12,15 @@ struct device;
 enum ucode_state { UCODE_ERROR, UCODE_OK, UCODE_NFOUND };
 
 struct microcode_ops {
-	void (*init)(struct device *device);
-	void (*fini)(void);
-	enum ucode_state (*request_microcode_user) (int cpu,
+	void (* const init)(struct device *device);
+	void (* const fini)(void);
+	enum ucode_state (* const request_microcode_user) (int cpu,
 				const void __user *buf, size_t size);
 
-	enum ucode_state (*request_microcode_fw) (int cpu,
+	enum ucode_state (* const request_microcode_fw) (int cpu,
 				struct device *device);
 
-	void (*microcode_fini_cpu) (int cpu);
+	void (* const microcode_fini_cpu) (int cpu);
 
 	/*
 	 * The generic 'microcode_core' part guarantees that
@@ -28,8 +28,8 @@ struct microcode_ops {
 	 * are being called.
 	 * See also the "Synchronization" section in microcode_core.c.
 	 */
-	int (*apply_microcode) (int cpu);
-	int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
+	int (* const apply_microcode) (int cpu);
+	int (* const collect_cpu_info) (int cpu, struct cpu_signature *csig);
 };
 
 struct ucode_cpu_info {
@@ -40,18 +40,18 @@ struct ucode_cpu_info {
 extern struct ucode_cpu_info ucode_cpu_info[];
 
 #ifdef CONFIG_MICROCODE_INTEL
-extern struct microcode_ops * __init init_intel_microcode(void);
+extern const struct microcode_ops * __init init_intel_microcode(void);
 #else
-static inline struct microcode_ops * __init init_intel_microcode(void)
+static inline const struct microcode_ops * __init init_intel_microcode(void)
 {
 	return NULL;
 }
 #endif /* CONFIG_MICROCODE_INTEL */
 
 #ifdef CONFIG_MICROCODE_AMD
-extern struct microcode_ops * __init init_amd_microcode(void);
+extern const struct microcode_ops * __init init_amd_microcode(void);
 #else
-static inline struct microcode_ops * __init init_amd_microcode(void)
+static inline const struct microcode_ops * __init init_amd_microcode(void)
 {
 	return NULL;
 }
diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index 37542b6..6b5ecf5 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -347,7 +347,7 @@ void fini_microcode_amd(void)
 	release_firmware(firmware);
 }
 
-static struct microcode_ops microcode_amd_ops = {
+static const struct microcode_ops microcode_amd_ops = {
 	.init				  = init_microcode_amd,
 	.fini				  = fini_microcode_amd,
 	.request_microcode_user           = request_microcode_user,
@@ -357,7 +357,7 @@ static struct microcode_ops microcode_amd_ops = {
 	.microcode_fini_cpu               = microcode_fini_cpu_amd,
 };
 
-struct microcode_ops * __init init_amd_microcode(void)
+const struct microcode_ops * __init init_amd_microcode(void)
 {
 	return &microcode_amd_ops;
 }
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index 844c02c..0e53e96 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -92,7 +92,7 @@ MODULE_LICENSE("GPL");
 
 #define MICROCODE_VERSION	"2.00"
 
-static struct microcode_ops	*microcode_ops;
+static const struct microcode_ops	*microcode_ops;
 
 /*
  * Synchronization.
diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c
index ebd193e..cdcde3c 100644
--- a/arch/x86/kernel/microcode_intel.c
+++ b/arch/x86/kernel/microcode_intel.c
@@ -453,7 +453,7 @@ static void microcode_fini_cpu(int cpu)
 	uci->mc = NULL;
 }
 
-static struct microcode_ops microcode_intel_ops = {
+static const struct microcode_ops microcode_intel_ops = {
 	.request_microcode_user		  = request_microcode_user,
 	.request_microcode_fw             = request_microcode_fw,
 	.collect_cpu_info                 = collect_cpu_info,
@@ -461,7 +461,7 @@ static struct microcode_ops microcode_intel_ops = {
 	.microcode_fini_cpu               = microcode_fini_cpu,
 };
 
-struct microcode_ops * __init init_intel_microcode(void)
+const struct microcode_ops * __init init_intel_microcode(void)
 {
 	return &microcode_intel_ops;
 }
-- 
1.6.5.3

[PATCH 1/1] Constify struct mtrr_ops for 2.6.32-git-053fe57ac v2

[re.emese]

From: Emese Revfy <re.emese@gmail.com>


Signed-off-by: Emese Revfy <re.emese@gmail.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
---
 arch/x86/kernel/cpu/mtrr/amd.c     |    2 +-
 arch/x86/kernel/cpu/mtrr/centaur.c |    2 +-
 arch/x86/kernel/cpu/mtrr/cyrix.c   |    2 +-
 arch/x86/kernel/cpu/mtrr/generic.c |    2 +-
 arch/x86/kernel/cpu/mtrr/main.c    |    6 +++---
 arch/x86/kernel/cpu/mtrr/mtrr.h    |   22 +++++++++++-----------
 6 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/arch/x86/kernel/cpu/mtrr/amd.c b/arch/x86/kernel/cpu/mtrr/amd.c
index 33af141..92ba9cd 100644
--- a/arch/x86/kernel/cpu/mtrr/amd.c
+++ b/arch/x86/kernel/cpu/mtrr/amd.c
@@ -108,7 +108,7 @@ amd_validate_add_page(unsigned long base, unsigned long size, unsigned int type)
 	return 0;
 }
 
-static struct mtrr_ops amd_mtrr_ops = {
+static const struct mtrr_ops amd_mtrr_ops = {
 	.vendor            = X86_VENDOR_AMD,
 	.set               = amd_set_mtrr,
 	.get               = amd_get_mtrr,
diff --git a/arch/x86/kernel/cpu/mtrr/centaur.c b/arch/x86/kernel/cpu/mtrr/centaur.c
index de89f14..316fe3e 100644
--- a/arch/x86/kernel/cpu/mtrr/centaur.c
+++ b/arch/x86/kernel/cpu/mtrr/centaur.c
@@ -110,7 +110,7 @@ centaur_validate_add_page(unsigned long base, unsigned long size, unsigned int t
 	return 0;
 }
 
-static struct mtrr_ops centaur_mtrr_ops = {
+static const struct mtrr_ops centaur_mtrr_ops = {
 	.vendor            = X86_VENDOR_CENTAUR,
 	.set               = centaur_set_mcr,
 	.get               = centaur_get_mcr,
diff --git a/arch/x86/kernel/cpu/mtrr/cyrix.c b/arch/x86/kernel/cpu/mtrr/cyrix.c
index 228d982..68a3343 100644
--- a/arch/x86/kernel/cpu/mtrr/cyrix.c
+++ b/arch/x86/kernel/cpu/mtrr/cyrix.c
@@ -265,7 +265,7 @@ static void cyrix_set_all(void)
 	post_set();
 }
 
-static struct mtrr_ops cyrix_mtrr_ops = {
+static const struct mtrr_ops cyrix_mtrr_ops = {
 	.vendor            = X86_VENDOR_CYRIX,
 	.set_all	   = cyrix_set_all,
 	.set               = cyrix_set_arr,
diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 55da0c5..4d75584 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -752,7 +752,7 @@ int positive_have_wrcomb(void)
 /*
  * Generic structure...
  */
-struct mtrr_ops generic_mtrr_ops = {
+const struct mtrr_ops generic_mtrr_ops = {
 	.use_intel_if		= 1,
 	.set_all		= generic_set_all,
 	.get			= generic_get_mtrr,
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 84e83de..fe4622e 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -60,14 +60,14 @@ static DEFINE_MUTEX(mtrr_mutex);
 u64 size_or_mask, size_and_mask;
 static bool mtrr_aps_delayed_init;
 
-static struct mtrr_ops *mtrr_ops[X86_VENDOR_NUM];
+static const struct mtrr_ops *mtrr_ops[X86_VENDOR_NUM];
 
-struct mtrr_ops *mtrr_if;
+const struct mtrr_ops *mtrr_if;
 
 static void set_mtrr(unsigned int reg, unsigned long base,
 		     unsigned long size, mtrr_type type);
 
-void set_mtrr_ops(struct mtrr_ops *ops)
+void set_mtrr_ops(const struct mtrr_ops *ops)
 {
 	if (ops->vendor && ops->vendor < X86_VENDOR_NUM)
 		mtrr_ops[ops->vendor] = ops;
diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.h b/arch/x86/kernel/cpu/mtrr/mtrr.h
index a501dee..d94607c 100644
--- a/arch/x86/kernel/cpu/mtrr/mtrr.h
+++ b/arch/x86/kernel/cpu/mtrr/mtrr.h
@@ -12,19 +12,19 @@
 extern unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
 
 struct mtrr_ops {
-	u32	vendor;
-	u32	use_intel_if;
-	void	(*set)(unsigned int reg, unsigned long base,
+	const u32	vendor;
+	const u32	use_intel_if;
+	void	(* const set)(unsigned int reg, unsigned long base,
 		       unsigned long size, mtrr_type type);
-	void	(*set_all)(void);
+	void	(* const set_all)(void);
 
-	void	(*get)(unsigned int reg, unsigned long *base,
+	void	(* const get)(unsigned int reg, unsigned long *base,
 		       unsigned long *size, mtrr_type *type);
-	int	(*get_free_region)(unsigned long base, unsigned long size,
+	int	(* const get_free_region)(unsigned long base, unsigned long size,
 				   int replace_reg);
-	int	(*validate_add_page)(unsigned long base, unsigned long size,
+	int	(* const validate_add_page)(unsigned long base, unsigned long size,
 				     unsigned int type);
-	int	(*have_wrcomb)(void);
+	int	(* const have_wrcomb)(void);
 };
 
 extern int generic_get_free_region(unsigned long base, unsigned long size,
@@ -32,7 +32,7 @@ extern int generic_get_free_region(unsigned long base, unsigned long size,
 extern int generic_validate_add_page(unsigned long base, unsigned long size,
 				     unsigned int type);
 
-extern struct mtrr_ops generic_mtrr_ops;
+extern const struct mtrr_ops generic_mtrr_ops;
 
 extern int positive_have_wrcomb(void);
 
@@ -53,10 +53,10 @@ void fill_mtrr_var_range(unsigned int index,
 		u32 base_lo, u32 base_hi, u32 mask_lo, u32 mask_hi);
 void get_mtrr_state(void);
 
-extern void set_mtrr_ops(struct mtrr_ops *ops);
+extern void set_mtrr_ops(const struct mtrr_ops *ops);
 
 extern u64 size_or_mask, size_and_mask;
-extern struct mtrr_ops *mtrr_if;
+extern const struct mtrr_ops *mtrr_if;
 
 #define is_cpu(vnd)	(mtrr_if && mtrr_if->vendor == X86_VENDOR_##vnd)
 #define use_intel()	(mtrr_if && mtrr_if->use_intel_if == 1)
-- 
1.6.5.3