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Subject[patch 16/20] x86, ptrace: add bts context unconditionally
Add the ptrace bts context field to task_struct unconditionally.

Initialize the field directly in copy_process().
Remove all the unneeded functionality used to initialize that field.


Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
---
arch/x86/include/asm/ptrace.h | 9 4 + 5 - 0 !
arch/x86/kernel/ptrace.c | 20 1 + 19 - 0 !
include/linux/ptrace.h | 10 0 + 10 - 0 !
include/linux/sched.h | 2 0 + 2 - 0 !
kernel/fork.c | 4 2 + 2 - 0 !
kernel/ptrace.c | 10 0 + 10 - 0 !
6 files changed, 7 insertions(+), 48 deletions(-)
Index: b/arch/x86/include/asm/ptrace.h
===================================================================
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -235,12 +235,11 @@ extern int do_get_thread_area(struct tas
extern int do_set_thread_area(struct task_struct *p, int idx,
struct user_desc __user *info, int can_allocate);

-extern void x86_ptrace_untrace(struct task_struct *);
-extern void x86_ptrace_fork(struct task_struct *child,
- unsigned long clone_flags);
+#ifdef CONFIG_X86_PTRACE_BTS
+extern void ptrace_bts_untrace(struct task_struct *tsk);

-#define arch_ptrace_untrace(tsk) x86_ptrace_untrace(tsk)
-#define arch_ptrace_fork(child, flags) x86_ptrace_fork(child, flags)
+#define arch_ptrace_untrace(tsk) ptrace_bts_untrace(tsk)
+#endif /* CONFIG_X86_PTRACE_BTS */

#endif /* __KERNEL__ */

Index: b/include/linux/ptrace.h
===================================================================
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -94,7 +94,6 @@ extern void ptrace_notify(int exit_code)
extern void __ptrace_link(struct task_struct *child,
struct task_struct *new_parent);
extern void __ptrace_unlink(struct task_struct *child);
-extern void ptrace_fork(struct task_struct *task, unsigned long clone_flags);
#define PTRACE_MODE_READ 1
#define PTRACE_MODE_ATTACH 2
/* Returns 0 on success, -errno on denial. */
@@ -326,15 +325,6 @@ static inline void user_enable_block_ste
#define arch_ptrace_untrace(task) do { } while (0)
#endif

-#ifndef arch_ptrace_fork
-/*
- * Do machine-specific work to initialize a new task.
- *
- * This is called from copy_process().
- */
-#define arch_ptrace_fork(child, clone_flags) do { } while (0)
-#endif
-
extern int task_current_syscall(struct task_struct *target, long *callno,
unsigned long args[6], unsigned int maxargs,
unsigned long *sp, unsigned long *pc);
Index: b/kernel/fork.c
===================================================================
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1100,8 +1100,8 @@ static struct task_struct *copy_process(
#ifdef CONFIG_DEBUG_MUTEXES
p->blocked_on = NULL; /* not blocked yet */
#endif
- if (unlikely(current->ptrace))
- ptrace_fork(p, clone_flags);
+
+ p->bts = NULL;

/* Perform scheduler related setup. Assign this task to a CPU. */
sched_fork(p, clone_flags);
Index: b/kernel/ptrace.c
===================================================================
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -27,16 +27,6 @@


/*
- * Initialize a new task whose father had been ptraced.
- *
- * Called from copy_process().
- */
-void ptrace_fork(struct task_struct *child, unsigned long clone_flags)
-{
- arch_ptrace_fork(child, clone_flags);
-}
-
-/*
* ptrace a task: make the debugger its new parent and
* move it to the ptrace list.
*
Index: b/arch/x86/kernel/ptrace.c
===================================================================
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -888,37 +888,19 @@ static int ptrace_bts_size(struct task_s
return (trace->ds.top - trace->ds.begin) / trace->ds.size;
}

-static inline void ptrace_bts_fork(struct task_struct *tsk)
-{
- tsk->bts = NULL;
-}
-
/*
* Called from __ptrace_unlink() after the child has been moved back
* to its original parent.
*/
-static inline void ptrace_bts_untrace(struct task_struct *child)
+void ptrace_bts_untrace(struct task_struct *child)
{
if (unlikely(child->bts)) {
free_bts_context(child->bts);
child->bts = NULL;
}
}
-#else
-static inline void ptrace_bts_fork(struct task_struct *tsk) {}
-static inline void ptrace_bts_untrace(struct task_struct *child) {}
#endif /* CONFIG_X86_PTRACE_BTS */

-void x86_ptrace_fork(struct task_struct *child, unsigned long clone_flags)
-{
- ptrace_bts_fork(child);
-}
-
-void x86_ptrace_untrace(struct task_struct *child)
-{
- ptrace_bts_untrace(child);
-}
-
/*
* Called by kernel/ptrace.c when detaching..
*
Index: b/include/linux/sched.h
===================================================================
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1207,13 +1207,11 @@ struct task_struct {
struct list_head ptraced;
struct list_head ptrace_entry;

-#ifdef CONFIG_X86_PTRACE_BTS
/*
* This is the tracer handle for the ptrace BTS extension.
* This field actually belongs to the ptracer task.
*/
struct bts_context *bts;
-#endif /* CONFIG_X86_PTRACE_BTS */

/* PID/PID hash table linkage. */
struct pid_link pids[PIDTYPE_MAX];
--
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