uprobes: Cleanup !CONFIG_UPROBES decls, unexport xol_area

1. Don't include asm/uprobes.h unconditionally, we only need
   it if CONFIG_UPROBES.

2. Move the definition of "struct xol_area" into uprobes.c.

   Perhaps we should simply kill struct uprobes_state, it buys
   nothing.

3. Kill the dummy definition of uprobe_get_swbp_addr(), nobody
   except handle_swbp() needs it.

4. Purely cosmetic, but move the decl of uprobe_get_swbp_addr()
   up, close to other __weak helpers.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>

2 files changed, 23 insertions, 27 deletions

diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 2225542624de..e32251e00e62 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -33,10 +33,6 @@ struct mm_struct;
 struct inode;
 struct notifier_block;
 
-#ifdef CONFIG_ARCH_SUPPORTS_UPROBES
-# include <asm/uprobes.h>
-#endif
-
 #define UPROBE_HANDLER_REMOVE           1
 #define UPROBE_HANDLER_MASK             1
 
@@ -61,6 +57,8 @@ struct uprobe_consumer {
 };
 
 #ifdef CONFIG_UPROBES
+#include <asm/uprobes.h>
+
 enum uprobe_task_state {
         UTASK_RUNNING,
         UTASK_SSTEP,
@@ -93,24 +91,7 @@ struct uprobe_task {
         unsigned int                    depth;
 };
 
-/*
- * On a breakpoint hit, thread contests for a slot.  It frees the
- * slot after singlestep. Currently a fixed number of slots are
- * allocated.
- */
-struct xol_area {
-        wait_queue_head_t       wq;             /* if all slots are busy */
-        atomic_t                slot_count;     /* number of in-use slots */
-        unsigned long           *bitmap;        /* 0 = free slot */
-        struct page             *page;
-
-        /*
-         * We keep the vma's vm_start rather than a pointer to the vma
-         * itself.  The probed process or a naughty kernel module could make
-         * the vma go away, and we must handle that reasonably gracefully.
-         */
-        unsigned long           vaddr;          /* Page(s) of instruction slots */
-};
+struct xol_area;
 
 struct uprobes_state {
         struct xol_area         *xol_area;
@@ -120,6 +101,7 @@ extern int __weak set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsign
 extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
 extern bool __weak is_swbp_insn(uprobe_opcode_t *insn);
 extern bool __weak is_trap_insn(uprobe_opcode_t *insn);
+extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs);
 extern int uprobe_write_opcode(struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_t);
 extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
 extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool);
@@ -131,7 +113,6 @@ extern void uprobe_end_dup_mmap(void);
 extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm);
 extern void uprobe_free_utask(struct task_struct *t);
 extern void uprobe_copy_process(struct task_struct *t, unsigned long flags);
-extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs);
 extern int uprobe_post_sstep_notifier(struct pt_regs *regs);
 extern int uprobe_pre_sstep_notifier(struct pt_regs *regs);
 extern void uprobe_notify_resume(struct pt_regs *regs);
@@ -187,10 +168,6 @@ static inline bool uprobe_deny_signal(void)
 {
         return false;
 }
-static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
-{
-        return 0;
-}
 static inline void uprobe_free_utask(struct task_struct *t)
 {
 }
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 445962a72498..51a7f535ff96 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -86,6 +86,25 @@ struct return_instance {
 };
 
 /*
+ * On a breakpoint hit, thread contests for a slot.  It frees the
+ * slot after singlestep. Currently a fixed number of slots are
+ * allocated.
+ */
+struct xol_area {
+        wait_queue_head_t       wq;             /* if all slots are busy */
+        atomic_t                slot_count;     /* number of in-use slots */
+        unsigned long           *bitmap;        /* 0 = free slot */
+        struct page             *page;
+
+        /*
+         * We keep the vma's vm_start rather than a pointer to the vma
+         * itself.  The probed process or a naughty kernel module could make
+         * the vma go away, and we must handle that reasonably gracefully.
+         */
+        unsigned long           vaddr;          /* Page(s) of instruction slots */
+};
+
+/*
  * valid_vma: Verify if the specified vma is an executable vma
  * Relax restrictions while unregistering: vm_flags might have
  * changed after breakpoint was inserted.