ptrace/x86: cleanup ptrace_set_debugreg()

ptrace_set_debugreg() is trivial but looks horrible.  Kill the unnecessary
goto's and return's to cleanup the code.

This matches ptrace_get_debugreg() which also needs the trivial whitespace
cleanups.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jan Kratochvil <jan.kratochvil@redhat.com>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Prasad <prasad@linux.vnet.ibm.com>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 5c387b3..7461f50 100644 (file)
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -703,7 +703,7 @@ restore:
  */
 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
 {
-       struct thread_struct *thread = &(tsk->thread);
+       struct thread_struct *thread = &tsk->thread;
        unsigned long val = 0;
 
        if (n < HBP_NUM) {
@@ -713,7 +713,7 @@ static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
                        val = bp->hw.info.address;
        } else if (n == 6) {
                val = thread->debugreg6;
-        } else if (n == 7) {
+       } else if (n == 7) {
                val = thread->ptrace_dr7;
        }
        return val;
@@ -761,30 +761,20 @@ static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
 static int ptrace_set_debugreg(struct task_struct *tsk, int n,
                               unsigned long val)
 {
-       struct thread_struct *thread = &(tsk->thread);
-       int rc = 0;
-
+       struct thread_struct *thread = &tsk->thread;
        /* There are no DR4 or DR5 registers */
-       if (n == 4 || n == 5)
-               return -EIO;
+       int rc = -EIO;
 
-       if (n == 6) {
-               thread->debugreg6 = val;
-               goto ret_path;
-       }
        if (n < HBP_NUM) {
                rc = ptrace_set_breakpoint_addr(tsk, n, val);
-               if (rc)
-                       return rc;
-       }
-       /* All that's left is DR7 */
-       if (n == 7) {
+       } else if (n == 6) {
+               thread->debugreg6 = val;
+               rc = 0;
+       } else if (n == 7) {
                rc = ptrace_write_dr7(tsk, val);
                if (!rc)
                        thread->ptrace_dr7 = val;
        }
-
-ret_path:
        return rc;
 }