powerpc/booke: Clean up the hardware watchpoint support

* CONFIG_BOOKE is selected by CONFIG_44x so we dont need both
* Fixed a few comments
* Go back to only using DBCR0_IDM to determine if we are using
  debug resources.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

4 files changed, 12 insertions, 11 deletions

diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 81c8324a4a3..da52269aec1 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -148,7 +148,7 @@ transfer_to_handler:
         /* Check to see if the dbcr0 register is set up to debug.  Use the
            internal debug mode bit to do this. */
         lwz     r12,THREAD_DBCR0(r12)
-        andis.  r12,r12,(DBCR0_IDM  | DBSR_DAC1R | DBSR_DAC1W)@h
+        andis.  r12,r12,DBCR0_IDM@h
         beq+    3f
         /* From user and task is ptraced - load up global dbcr0 */
         li      r12,-1                  /* clear all pending debug events */
@@ -292,7 +292,7 @@ syscall_exit_cont:
         /* If the process has its own DBCR0 value, load it up.  The internal
            debug mode bit tells us that dbcr0 should be loaded. */
         lwz     r0,THREAD+THREAD_DBCR0(r2)
-        andis.  r10,r0,(DBCR0_IDM  | DBSR_DAC1R | DBSR_DAC1W)@h
+        andis.  r10,r0,DBCR0_IDM@h
         bnel-   load_dbcr0
 #endif
 #ifdef CONFIG_44x
@@ -720,7 +720,7 @@ restore_user:
         /* Check whether this process has its own DBCR0 value.  The internal
            debug mode bit tells us that dbcr0 should be loaded. */
         lwz     r0,THREAD+THREAD_DBCR0(r2)
-        andis.  r10,r0,(DBCR0_IDM  | DBSR_DAC1R | DBSR_DAC1W)@h
+        andis.  r10,r0,DBCR0_IDM@h
         bnel-   load_dbcr0
 #endif
 
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index db2497ccc11..e030f3bd502 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -254,7 +254,7 @@ void do_dabr(struct pt_regs *regs, unsigned long address,
                 return;
 
         /* Clear the DAC and struct entries.  One shot trigger */
-#if (defined(CONFIG_44x) || defined(CONFIG_BOOKE))
+#if defined(CONFIG_BOOKE)
         mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~(DBSR_DAC1R | DBSR_DAC1W
                                                         | DBCR0_IDM));
 #endif
@@ -286,7 +286,7 @@ int set_dabr(unsigned long dabr)
         mtspr(SPRN_DABR, dabr);
 #endif
 
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
         mtspr(SPRN_DAC1, dabr);
 #endif
 
@@ -373,7 +373,7 @@ struct task_struct *__switch_to(struct task_struct *prev,
         if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr))
                 set_dabr(new->thread.dabr);
 
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
         /* If new thread DAC (HW breakpoint) is the same then leave it */
         if (new->thread.dabr)
                 set_dabr(new->thread.dabr);
@@ -568,7 +568,7 @@ void flush_thread(void)
                 current->thread.dabr = 0;
                 set_dabr(0);
 
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
                 current->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W);
 #endif
         }
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index a5d0e78779c..66204cb51a1 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -717,7 +717,7 @@ void user_disable_single_step(struct task_struct *task)
         struct pt_regs *regs = task->thread.regs;
 
 
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
         /* If DAC then do not single step, skip */
         if (task->thread.dabr)
                 return;
@@ -744,10 +744,11 @@ int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
         if (addr > 0)
                 return -EINVAL;
 
+        /* The bottom 3 bits in dabr are flags */
         if ((data & ~0x7UL) >= TASK_SIZE)
                 return -EIO;
 
-#ifdef CONFIG_PPC64
+#ifndef CONFIG_BOOKE
 
         /* For processors using DABR (i.e. 970), the bottom 3 bits are flags.
          *  It was assumed, on previous implementations, that 3 bits were
@@ -769,7 +770,7 @@ int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
         task->thread.dabr = data;
 
 #endif
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
 
         /* As described above, it was assumed 3 bits were passed with the data
          *  address, but we will assume only the mode bits will be passed
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index 7aada783ec6..2b5eaa6c8f3 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -147,7 +147,7 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
          */
         if (current->thread.dabr) {
                 set_dabr(current->thread.dabr);
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
                 mtspr(SPRN_DBCR0, current->thread.dbcr0);
 #endif
         }