x86: __show_registers() and __show_regs() API unification

Currently the low-level function to dump user-passed registers on i386 is
called __show_registers() whereas on x86-64 it's called __show_regs(). Unify
the API to simplify porting of kmemcheck to x86-64.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/process_32.c

@@ -123,7 +123,7 @@ void cpu_idle(void)
 	}
 }
 
-void __show_registers(struct pt_regs *regs, int all)
+void __show_regs(struct pt_regs *regs, int all)
 {
 	unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L;
 	unsigned long d0, d1, d2, d3, d6, d7;
@@ -189,7 +189,7 @@ void __show_registers(struct pt_regs *regs, int all)
 
 void show_regs(struct pt_regs *regs)
 {
-	__show_registers(regs, 1);
+	__show_regs(regs, 1);
 	show_trace(NULL, regs, &regs->sp, regs->bp);
 }
 

arch/x86/kernel/process_64.c

@@ -136,7 +136,7 @@ void cpu_idle(void)
 }
 
 /* Prints also some state that isn't saved in the pt_regs */
-void __show_regs(struct pt_regs *regs)
+void __show_regs(struct pt_regs *regs, int all)
 {
 	unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L, fs, gs, shadowgs;
 	unsigned long d0, d1, d2, d3, d6, d7;
@@ -175,6 +175,9 @@ void __show_regs(struct pt_regs *regs)
 	rdmsrl(MSR_GS_BASE, gs);
 	rdmsrl(MSR_KERNEL_GS_BASE, shadowgs);
 
+	if (!all)
+		return;
+
 	cr0 = read_cr0();
 	cr2 = read_cr2();
 	cr3 = read_cr3();
@@ -200,7 +203,7 @@ void __show_regs(struct pt_regs *regs)
 void show_regs(struct pt_regs *regs)
 {
 	printk(KERN_INFO "CPU %d:", smp_processor_id());
-	__show_regs(regs);
+	__show_regs(regs, 1);
 	show_trace(NULL, regs, (void *)(regs + 1), regs->bp);
 }
 

arch/x86/kernel/traps_32.c

@@ -319,7 +319,7 @@ void show_registers(struct pt_regs *regs)
 	int i;
 
 	print_modules();
-	__show_registers(regs, 0);
+	__show_regs(regs, 0);
 
 	printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)",
 		TASK_COMM_LEN, current->comm, task_pid_nr(current),

arch/x86/kernel/traps_64.c

@@ -430,7 +430,7 @@ void show_registers(struct pt_regs *regs)
 
 	sp = regs->sp;
 	printk("CPU %d ", cpu);
-	__show_regs(regs);
+	__show_regs(regs, 1);
 	printk("Process %s (pid: %d, threadinfo %p, task %p)\n",
 		cur->comm, cur->pid, task_thread_info(cur), cur);
 

include/asm-x86/kdebug.h

@@ -27,10 +27,9 @@ extern void printk_address(unsigned long address, int reliable);
 extern void die(const char *, struct pt_regs *,long);
 extern int __must_check __die(const char *, struct pt_regs *, long);
 extern void show_registers(struct pt_regs *regs);
-extern void __show_registers(struct pt_regs *, int all);
 extern void show_trace(struct task_struct *t, struct pt_regs *regs,
 		       unsigned long *sp, unsigned long bp);
-extern void __show_regs(struct pt_regs *regs);
+extern void __show_regs(struct pt_regs *regs, int all);
 extern void show_regs(struct pt_regs *regs);
 extern unsigned long oops_begin(void);
 extern void oops_end(unsigned long, struct pt_regs *, int signr);