uprobes/core: Move insn to arch specific structure

Few cleanups suggested by Ingo Molnar.

- Rename struct uprobe_arch_info to struct arch_uprobe.
- Move insn from struct uprobe to struct arch_uprobe.
- Make arch specific uprobe functions to accept struct arch_uprobe
  instead of  struct uprobe.
- Move struct uprobe to kernel/uprobes.c from include/linux/uprobes.h

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Anton Arapov <anton@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Josh Stone <jistone@redhat.com>
Link: http://lkml.kernel.org/r/20120222091602.15880.40249.sendpatchset@srdronam.in.ibm.com
[ Made various small improvements ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 26 insertions, 12 deletions

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index ee496ad95db3..13f1b5909af4 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -65,6 +65,18 @@ struct vma_info {
         loff_t                  vaddr;
 };
 
+struct uprobe {
+        struct rb_node          rb_node;        /* node in the rb tree */
+        atomic_t                ref;
+        struct rw_semaphore     consumer_rwsem;
+        struct list_head        pending_list;
+        struct uprobe_consumer  *consumers;
+        struct inode            *inode;         /* Also hold a ref to inode */
+        loff_t                  offset;
+        int                     flags;
+        struct arch_uprobe      arch;
+};
+
 /*
  * valid_vma: Verify if the specified vma is an executable vma
  * Relax restrictions while unregistering: vm_flags might have
@@ -180,7 +192,7 @@ bool __weak is_bkpt_insn(uprobe_opcode_t *insn)
 /*
  * write_opcode - write the opcode at a given virtual address.
  * @mm: the probed process address space.
- * @uprobe: the breakpointing information.
+ * @arch_uprobe: the breakpointing information.
  * @vaddr: the virtual address to store the opcode.
  * @opcode: opcode to be written at @vaddr.
  *
@@ -190,13 +202,14 @@ 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 uprobe *uprobe,
+static int write_opcode(struct mm_struct *mm, struct arch_uprobe *auprobe,
                         unsigned long vaddr, uprobe_opcode_t opcode)
 {
         struct page *old_page, *new_page;
         struct address_space *mapping;
         void *vaddr_old, *vaddr_new;
         struct vm_area_struct *vma;
+        struct uprobe *uprobe;
         loff_t addr;
         int ret;
 
@@ -216,6 +229,7 @@ static int write_opcode(struct mm_struct *mm, struct uprobe *uprobe,
         if (!valid_vma(vma, is_bkpt_insn(&opcode)))
                 goto put_out;
 
+        uprobe = container_of(auprobe, struct uprobe, arch);
         mapping = uprobe->inode->i_mapping;
         if (mapping != vma->vm_file->f_mapping)
                 goto put_out;
@@ -326,7 +340,7 @@ static int is_bkpt_at_addr(struct mm_struct *mm, unsigned long vaddr)
  * 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 uprobe *uprobe, unsigned long vaddr)
+int __weak set_bkpt(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned long vaddr)
 {
         int result;
 
@@ -337,7 +351,7 @@ int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe, unsigned long v
         if (result)
                 return result;
 
-        return write_opcode(mm, uprobe, vaddr, UPROBES_BKPT_INSN);
+        return write_opcode(mm, auprobe, vaddr, UPROBES_BKPT_INSN);
 }
 
 /**
@@ -351,7 +365,7 @@ int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe, unsigned long v
  * Return 0 (success) or a negative errno.
  */
 int __weak
-set_orig_insn(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr, bool verify)
+set_orig_insn(struct mm_struct *mm, struct arch_uprobe *auprobe, unsigned long vaddr, bool verify)
 {
         if (verify) {
                 int result;
@@ -363,7 +377,7 @@ set_orig_insn(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr,
                 if (result != 1)
                         return result;
         }
-        return write_opcode(mm, uprobe, vaddr, *(uprobe_opcode_t *)uprobe->insn);
+        return write_opcode(mm, auprobe, vaddr, *(uprobe_opcode_t *)auprobe->insn);
 }
 
 static int match_uprobe(struct uprobe *l, struct uprobe *r)
@@ -593,13 +607,13 @@ static int copy_insn(struct uprobe *uprobe, struct vm_area_struct *vma, unsigned
 
         /* Instruction at the page-boundary; copy bytes in second page */
         if (nbytes < bytes) {
-                if (__copy_insn(mapping, vma, uprobe->insn + nbytes,
+                if (__copy_insn(mapping, vma, uprobe->arch.insn + nbytes,
                                 bytes - nbytes, uprobe->offset + nbytes))
                         return -ENOMEM;
 
                 bytes = nbytes;
         }
-        return __copy_insn(mapping, vma, uprobe->insn, bytes, uprobe->offset);
+        return __copy_insn(mapping, vma, uprobe->arch.insn, bytes, uprobe->offset);
 }
 
 static int install_breakpoint(struct mm_struct *mm, struct uprobe *uprobe,
@@ -625,23 +639,23 @@ static int install_breakpoint(struct mm_struct *mm, struct uprobe *uprobe,
                 if (ret)
                         return ret;
 
-                if (is_bkpt_insn((uprobe_opcode_t *)uprobe->insn))
+                if (is_bkpt_insn((uprobe_opcode_t *)uprobe->arch.insn))
                         return -EEXIST;
 
-                ret = arch_uprobes_analyze_insn(mm, uprobe);
+                ret = arch_uprobes_analyze_insn(mm, &uprobe->arch);
                 if (ret)
                         return ret;
 
                 uprobe->flags |= UPROBES_COPY_INSN;
         }
-        ret = set_bkpt(mm, uprobe, addr);
+        ret = set_bkpt(mm, &uprobe->arch, addr);
 
         return ret;
 }
 
 static void remove_breakpoint(struct mm_struct *mm, struct uprobe *uprobe, loff_t vaddr)
 {
-        set_orig_insn(mm, uprobe, (unsigned long)vaddr, true);
+        set_orig_insn(mm, &uprobe->arch, (unsigned long)vaddr, true);
 }
 
 static void delete_uprobe(struct uprobe *uprobe)