powerpc/64s: Always has full regs, so remove remnant checks

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200507121332.2233629-1-mpe@ellerman.id.au

arch/powerpc/include/asm/ptrace.h

@@ -179,24 +179,33 @@ extern int ptrace_put_reg(struct task_struct *task, int regno,
 
 #define current_pt_regs() \
 	((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1)
+
+#ifdef __powerpc64__
+#ifdef CONFIG_PPC_BOOK3S
+#define TRAP(regs)		((regs)->trap)
+#define FULL_REGS(regs)		true
+#define SET_FULL_REGS(regs)	do { } while (0)
+#else
+#define TRAP(regs)		((regs)->trap & ~0x1)
+#define FULL_REGS(regs)		(((regs)->trap & 1) == 0)
+#define SET_FULL_REGS(regs)	((regs)->trap |= 1)
+#endif
+#define CHECK_FULL_REGS(regs)	BUG_ON(!FULL_REGS(regs))
+#define NV_REG_POISON		0xdeadbeefdeadbeefUL
+#else
 /*
  * We use the least-significant bit of the trap field to indicate
  * whether we have saved the full set of registers, or only a
  * partial set.  A 1 there means the partial set.
  * On 4xx we use the next bit to indicate whether the exception
  * is a critical exception (1 means it is).
  */
+#define TRAP(regs)		((regs)->trap & ~0xF)
 #define FULL_REGS(regs)		(((regs)->trap & 1) == 0)
-#ifndef __powerpc64__
+#define SET_FULL_REGS(regs)	((regs)->trap |= 1)
 #define IS_CRITICAL_EXC(regs)	(((regs)->trap & 2) != 0)
 #define IS_MCHECK_EXC(regs)	(((regs)->trap & 4) != 0)
 #define IS_DEBUG_EXC(regs)	(((regs)->trap & 8) != 0)
-#endif /* ! __powerpc64__ */
-#define TRAP(regs)		((regs)->trap & ~0xF)
-#ifdef __powerpc64__
-#define NV_REG_POISON		0xdeadbeefdeadbeefUL
-#define CHECK_FULL_REGS(regs)	BUG_ON(regs->trap & 1)
-#else
 #define NV_REG_POISON		0xdeadbeef
 #define CHECK_FULL_REGS(regs)						      \
 do {									      \

arch/powerpc/kernel/process.c

@@ -1720,7 +1720,7 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
 	 * FULL_REGS(regs) return true.  This is necessary to allow
 	 * ptrace to examine the thread immediately after exec.
 	 */
-	regs->trap &= ~1UL;
+	SET_FULL_REGS(regs);
 
 #ifdef CONFIG_PPC32
 	regs->mq = 0;