uprobes/core: Make order of function parameters consistent across functions

If a function takes struct uprobe or struct arch_uprobe, then it
is passed as the first parameter.

This is pure cleanup, no functional change intended.

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@linux.vnet.ibm.com>
Cc: Linux-mm <linux-mm@kvack.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120312092530.5379.18394.sendpatchset@srdronam.in.ibm.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

4 files changed, 63 insertions, 59 deletions

diff --git a/arch/x86/include/asm/uprobes.h b/arch/x86/include/asm/uprobes.h
index 5c399e446512..384f1bebf884 100644
--- a/arch/x86/include/asm/uprobes.h
+++ b/arch/x86/include/asm/uprobes.h
@@ -39,5 +39,5 @@ struct arch_uprobe {
 #endif
 };
 
-extern int arch_uprobes_analyze_insn(struct mm_struct *mm, struct arch_uprobe *arch_uprobe);
+extern int arch_uprobes_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm);
 #endif  /* _ASM_UPROBES_H */
diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c
index 6dfa89e6f24a..851a11b0d38c 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -297,7 +297,8 @@ static void prepare_fixups(struct arch_uprobe *auprobe, struct insn *insn)
  *  - There's never a SIB byte.
  *  - The displacement is always 4 bytes.
  */
-static void handle_riprel_insn(struct mm_struct *mm, struct arch_uprobe *auprobe, struct insn *insn)
+static void
+handle_riprel_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, struct insn *insn)
 {
         u8 *cursor;
         u8 reg;
@@ -381,19 +382,19 @@ static int validate_insn_64bits(struct arch_uprobe *auprobe, struct insn *insn)
         return -ENOTSUPP;
 }
 
-static int validate_insn_bits(struct mm_struct *mm, struct arch_uprobe *auprobe, struct insn *insn)
+static int validate_insn_bits(struct arch_uprobe *auprobe, struct mm_struct *mm, struct insn *insn)
 {
         if (mm->context.ia32_compat)
                 return validate_insn_32bits(auprobe, insn);
         return validate_insn_64bits(auprobe, insn);
 }
 #else /* 32-bit: */
-static void handle_riprel_insn(struct mm_struct *mm, struct arch_uprobe *auprobe, struct insn *insn)
+static void handle_riprel_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, struct insn *insn)
 {
         /* No RIP-relative addressing on 32-bit */
 }
 
-static int validate_insn_bits(struct mm_struct *mm, struct arch_uprobe *auprobe, struct insn *insn)
+static int validate_insn_bits(struct arch_uprobe *auprobe, struct mm_struct *mm,  struct insn *insn)
 {
         return validate_insn_32bits(auprobe, insn);
 }
@@ -405,17 +406,17 @@ static int validate_insn_bits(struct mm_struct *mm, struct arch_uprobe *auprobe,
  * @arch_uprobe: the probepoint information.
  * Return 0 on success or a -ve number on error.
  */
-int arch_uprobes_analyze_insn(struct mm_struct *mm, struct arch_uprobe *auprobe)
+int arch_uprobes_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm)
 {
         int ret;
         struct insn insn;
 
         auprobe->fixups = 0;
-        ret = validate_insn_bits(mm, auprobe, &insn);
+        ret = validate_insn_bits(auprobe, mm, &insn);
         if (ret != 0)
                 return ret;
 
-        handle_riprel_insn(mm, auprobe, &insn);
+        handle_riprel_insn(auprobe, mm, &insn);
         prepare_fixups(auprobe, &insn);
 
         return 0;
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 838fb312926a..58699182e9a7 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -52,20 +52,20 @@ struct uprobe_consumer {
 };
 
 #ifdef CONFIG_UPROBES
-extern int __weak set_bkpt(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned long vaddr);
-extern int __weak set_orig_insn(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned long vaddr, bool verify);
+extern int __weak set_bkpt(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
+extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm,  unsigned long vaddr, bool verify);
 extern bool __weak is_bkpt_insn(uprobe_opcode_t *insn);
-extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer);
-extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer);
+extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
+extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
 extern int uprobe_mmap(struct vm_area_struct *vma);
 #else /* CONFIG_UPROBES is not defined */
 static inline int
-uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer)
+uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 {
         return -ENOSYS;
 }
 static inline void
-uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer)
+uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 {
 }
 static inline int uprobe_mmap(struct vm_area_struct *vma)
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 0d36bf3920ba..9c5ddff1c8da 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -192,8 +192,8 @@ bool __weak is_bkpt_insn(uprobe_opcode_t *insn)
 
 /*
  * write_opcode - write the opcode at a given virtual address.
+ * @auprobe: arch breakpointing information.
  * @mm: the probed process address space.
- * @arch_uprobe: the breakpointing information.
  * @vaddr: the virtual address to store the opcode.
  * @opcode: opcode to be written at @vaddr.
  *
@@ -203,7 +203,7 @@ bool __weak is_bkpt_insn(uprobe_opcode_t *insn)
  * For mm @mm, write the opcode at @vaddr.
  * Return 0 (success) or a negative errno.
  */
-static int write_opcode(struct mm_struct *mm, struct arch_uprobe *auprobe,
+static int write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm,
                         unsigned long vaddr, uprobe_opcode_t opcode)
 {
         struct page *old_page, *new_page;
@@ -334,14 +334,14 @@ static int is_bkpt_at_addr(struct mm_struct *mm, unsigned long vaddr)
 
 /**
  * set_bkpt - store breakpoint at a given address.
+ * @auprobe: arch specific probepoint information.
  * @mm: the probed process address space.
- * @uprobe: the probepoint information.
  * @vaddr: the virtual address to insert the opcode.
  *
  * For mm @mm, store the breakpoint instruction at @vaddr.
  * Return 0 (success) or a negative errno.
  */
-int __weak set_bkpt(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned long vaddr)
+int __weak set_bkpt(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr)
 {
         int result;
 
@@ -352,13 +352,13 @@ int __weak set_bkpt(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned
         if (result)
                 return result;
 
-        return write_opcode(mm, auprobe, vaddr, UPROBE_BKPT_INSN);
+        return write_opcode(auprobe, mm, vaddr, UPROBE_BKPT_INSN);
 }
 
 /**
  * set_orig_insn - Restore the original instruction.
  * @mm: the probed process address space.
- * @uprobe: the probepoint information.
+ * @auprobe: arch specific probepoint information.
  * @vaddr: the virtual address to insert the opcode.
  * @verify: if true, verify existance of breakpoint instruction.
  *
@@ -366,7 +366,7 @@ int __weak set_bkpt(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned
  * Return 0 (success) or a negative errno.
  */
 int __weak
-set_orig_insn(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned long vaddr, bool verify)
+set_orig_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr, bool verify)
 {
         if (verify) {
                 int result;
@@ -378,7 +378,7 @@ set_orig_insn(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned long v
                 if (result != 1)
                         return result;
         }
-        return write_opcode(mm, auprobe, vaddr, *(uprobe_opcode_t *)auprobe->insn);
+        return write_opcode(auprobe, mm, vaddr, *(uprobe_opcode_t *)auprobe->insn);
 }
 
 static int match_uprobe(struct uprobe *l, struct uprobe *r)
@@ -525,30 +525,30 @@ static struct uprobe *alloc_uprobe(struct inode *inode, loff_t offset)
 
 /* Returns the previous consumer */
 static struct uprobe_consumer *
-consumer_add(struct uprobe *uprobe, struct uprobe_consumer *consumer)
+consumer_add(struct uprobe *uprobe, struct uprobe_consumer *uc)
 {
         down_write(&uprobe->consumer_rwsem);
-        consumer->next = uprobe->consumers;
-        uprobe->consumers = consumer;
+        uc->next = uprobe->consumers;
+        uprobe->consumers = uc;
         up_write(&uprobe->consumer_rwsem);
 
-        return consumer->next;
+        return uc->next;
 }
 
 /*
- * For uprobe @uprobe, delete the consumer @consumer.
- * Return true if the @consumer is deleted successfully
+ * For uprobe @uprobe, delete the consumer @uc.
+ * Return true if the @uc is deleted successfully
  * or return false.
  */
-static bool consumer_del(struct uprobe *uprobe, struct uprobe_consumer *consumer)
+static bool consumer_del(struct uprobe *uprobe, struct uprobe_consumer *uc)
 {
         struct uprobe_consumer **con;
         bool ret = false;
 
         down_write(&uprobe->consumer_rwsem);
         for (con = &uprobe->consumers; *con; con = &(*con)->next) {
-                if (*con == consumer) {
-                        *con = consumer->next;
+                if (*con == uc) {
+                        *con = uc->next;
                         ret = true;
                         break;
                 }
@@ -558,8 +558,8 @@ static bool consumer_del(struct uprobe *uprobe, struct uprobe_consumer *consumer
         return ret;
 }
 
-static int __copy_insn(struct address_space *mapping,
-                        struct vm_area_struct *vma, char *insn,
+static int
+__copy_insn(struct address_space *mapping, struct vm_area_struct *vma, char *insn,
                         unsigned long nbytes, unsigned long offset)
 {
         struct file *filp = vma->vm_file;
@@ -590,7 +590,8 @@ static int __copy_insn(struct address_space *mapping,
         return 0;
 }
 
-static int copy_insn(struct uprobe *uprobe, struct vm_area_struct *vma, unsigned long addr)
+static int
+copy_insn(struct uprobe *uprobe, struct vm_area_struct *vma, unsigned long addr)
 {
         struct address_space *mapping;
         unsigned long nbytes;
@@ -617,8 +618,9 @@ static int copy_insn(struct uprobe *uprobe, struct vm_area_struct *vma, unsigned
         return __copy_insn(mapping, vma, uprobe->arch.insn, bytes, uprobe->offset);
 }
 
-static int install_breakpoint(struct mm_struct *mm, struct uprobe *uprobe,
-                                struct vm_area_struct *vma, loff_t vaddr)
+static int
+install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
+                        struct vm_area_struct *vma, loff_t vaddr)
 {
         unsigned long addr;
         int ret;
@@ -643,20 +645,21 @@ static int install_breakpoint(struct mm_struct *mm, struct uprobe *uprobe,
                 if (is_bkpt_insn((uprobe_opcode_t *)uprobe->arch.insn))
                         return -EEXIST;
 
-                ret = arch_uprobes_analyze_insn(mm, &uprobe->arch);
+                ret = arch_uprobes_analyze_insn(&uprobe->arch, mm);
                 if (ret)
                         return ret;
 
                 uprobe->flags |= UPROBE_COPY_INSN;
         }
-        ret = set_bkpt(mm, &uprobe->arch, addr);
+        ret = set_bkpt(&uprobe->arch, mm, addr);
 
         return ret;
 }
 
-static void remove_breakpoint(struct mm_struct *mm, struct uprobe *uprobe, loff_t vaddr)
+static void
+remove_breakpoint(struct uprobe *uprobe, struct mm_struct *mm, loff_t vaddr)
 {
-        set_orig_insn(mm, &uprobe->arch, (unsigned long)vaddr, true);
+        set_orig_insn(&uprobe->arch, mm, (unsigned long)vaddr, true);
 }
 
 static void delete_uprobe(struct uprobe *uprobe)
@@ -671,9 +674,9 @@ static void delete_uprobe(struct uprobe *uprobe)
         atomic_dec(&uprobe_events);
 }
 
-static struct vma_info *__find_next_vma_info(struct list_head *head,
-                        loff_t offset, struct address_space *mapping,
-                        struct vma_info *vi, bool is_register)
+static struct vma_info *
+__find_next_vma_info(struct address_space *mapping, struct list_head *head,
+                        struct vma_info *vi, loff_t offset, bool is_register)
 {
         struct prio_tree_iter iter;
         struct vm_area_struct *vma;
@@ -719,8 +722,8 @@ static struct vma_info *__find_next_vma_info(struct list_head *head,
  * yet been inserted.
  */
 static struct vma_info *
-find_next_vma_info(struct list_head *head, loff_t offset, struct address_space *mapping,
-                   bool is_register)
+find_next_vma_info(struct address_space *mapping, struct list_head *head,
+                loff_t offset, bool is_register)
 {
         struct vma_info *vi, *retvi;
 
@@ -729,7 +732,7 @@ find_next_vma_info(struct list_head *head, loff_t offset, struct address_space *
                 return ERR_PTR(-ENOMEM);
 
         mutex_lock(&mapping->i_mmap_mutex);
-        retvi = __find_next_vma_info(head, offset, mapping, vi, is_register);
+        retvi = __find_next_vma_info(mapping, head, vi, offset, is_register);
         mutex_unlock(&mapping->i_mmap_mutex);
 
         if (!retvi)
@@ -754,7 +757,7 @@ static int register_for_each_vma(struct uprobe *uprobe, bool is_register)
         ret = 0;
 
         for (;;) {
-                vi = find_next_vma_info(&try_list, uprobe->offset, mapping, is_register);
+                vi = find_next_vma_info(mapping, &try_list, uprobe->offset, is_register);
                 if (!vi)
                         break;
 
@@ -784,9 +787,9 @@ static int register_for_each_vma(struct uprobe *uprobe, bool is_register)
                 }
 
                 if (is_register)
-                        ret = install_breakpoint(mm, uprobe, vma, vi->vaddr);
+                        ret = install_breakpoint(uprobe, mm, vma, vi->vaddr);
                 else
-                        remove_breakpoint(mm, uprobe, vi->vaddr);
+                        remove_breakpoint(uprobe, mm, vi->vaddr);
 
                 up_read(&mm->mmap_sem);
                 mmput(mm);
@@ -823,25 +826,25 @@ static void __uprobe_unregister(struct uprobe *uprobe)
  * uprobe_register - register a probe
  * @inode: the file in which the probe has to be placed.
  * @offset: offset from the start of the file.
- * @consumer: information on howto handle the probe..
+ * @uc: information on howto handle the probe..
  *
  * Apart from the access refcount, uprobe_register() takes a creation
  * refcount (thro alloc_uprobe) if and only if this @uprobe is getting
  * inserted into the rbtree (i.e first consumer for a @inode:@offset
  * tuple).  Creation refcount stops uprobe_unregister from freeing the
  * @uprobe even before the register operation is complete. Creation
- * refcount is released when the last @consumer for the @uprobe
+ * refcount is released when the last @uc for the @uprobe
  * unregisters.
  *
  * Return errno if it cannot successully install probes
  * else return 0 (success)
  */
-int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer)
+int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 {
         struct uprobe *uprobe;
         int ret;
 
-        if (!inode || !consumer || consumer->next)
+        if (!inode || !uc || uc->next)
                 return -EINVAL;
 
         if (offset > i_size_read(inode))
@@ -851,7 +854,7 @@ int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *
         mutex_lock(uprobes_hash(inode));
         uprobe = alloc_uprobe(inode, offset);
 
-        if (uprobe && !consumer_add(uprobe, consumer)) {
+        if (uprobe && !consumer_add(uprobe, uc)) {
                 ret = __uprobe_register(uprobe);
                 if (ret) {
                         uprobe->consumers = NULL;
@@ -871,13 +874,13 @@ int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *
  * uprobe_unregister - unregister a already registered probe.
  * @inode: the file in which the probe has to be removed.
  * @offset: offset from the start of the file.
- * @consumer: identify which probe if multiple probes are colocated.
+ * @uc: identify which probe if multiple probes are colocated.
  */
-void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer)
+void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 {
         struct uprobe *uprobe;
 
-        if (!inode || !consumer)
+        if (!inode || !uc)
                 return;
 
         uprobe = find_uprobe(inode, offset);
@@ -886,7 +889,7 @@ void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consume
 
         mutex_lock(uprobes_hash(inode));
 
-        if (consumer_del(uprobe, consumer)) {
+        if (consumer_del(uprobe, uc)) {
                 if (!uprobe->consumers) {
                         __uprobe_unregister(uprobe);
                         uprobe->flags &= ~UPROBE_RUN_HANDLER;
@@ -993,7 +996,7 @@ int uprobe_mmap(struct vm_area_struct *vma)
                 if (!ret) {
                         vaddr = vma_address(vma, uprobe->offset);
                         if (vaddr >= vma->vm_start && vaddr < vma->vm_end) {
-                                ret = install_breakpoint(vma->vm_mm, uprobe, vma, vaddr);
+                                ret = install_breakpoint(uprobe, vma->vm_mm, vma, vaddr);
                                 /* Ignore double add: */
                                 if (ret == -EEXIST)
                                         ret = 0;