Date:	Sat, 10 Mar 2012 23:15:16 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Oleg Nesterov <oleg@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 2/7] uprobes/core: make order of function parameters consistent across functions.

From: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

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@...ux.vnet.ibm.com>
---
 arch/x86/include/asm/uprobes.h |    2 -
 arch/x86/kernel/uprobes.c      |   15 +++---
 include/linux/uprobes.h        |   12 +++--
 kernel/events/uprobes.c        |   93 +++++++++++++++++++++-------------------
 4 files changed, 63 insertions(+), 59 deletions(-)

diff --git a/arch/x86/include/asm/uprobes.h b/arch/x86/include/asm/uprobes.h
index 5c399e4..384f1be 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 6dfa89e..851a11b 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 838fb31..5869918 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 0d36bf3..9c5ddff 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;


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