kdb: Get rid of redundant kdb_curr_task()

Commit cf8e8658 ("arch: Remove Itanium (IA-64) architecture")
removed the only definition of macro _TIF_MCA_INIT, so kdb_curr_task()
is actually the same as curr_task() now and becomes redundant.

Let's remove the definition of kdb_curr_task() and replace remaining
calls with curr_task().
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20240620142132.157518-1-zhengzengkai@huawei.comSigned-off-by: Daniel Thompson <daniel.thompson@linaro.org>

kernel/debug/kdb/kdb_bt.c

@@ -144,7 +144,7 @@ kdb_bt(int argc, const char **argv)
 			kdb_ps_suppressed();
 		/* Run the active tasks first */
 		for_each_online_cpu(cpu) {
-			p = kdb_curr_task(cpu);
+			p = curr_task(cpu);
 			if (kdb_bt1(p, mask, btaprompt))
 				return 0;
 		}

kernel/debug/kdb/kdb_main.c

@@ -155,16 +155,6 @@ static char *__env[31] = {
 
 static const int __nenv = ARRAY_SIZE(__env);
 
-struct task_struct *kdb_curr_task(int cpu)
-{
-	struct task_struct *p = curr_task(cpu);
-#ifdef	_TIF_MCA_INIT
-	if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
-		p = krp->p;
-#endif
-	return p;
-}
-
 /*
  * Update the permissions flags (kdb_cmd_enabled) to match the
  * current lockdown state.
@@ -1228,7 +1218,7 @@ static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
 	char *cmdbuf;
 	int diag;
 	struct task_struct *kdb_current =
-		kdb_curr_task(raw_smp_processor_id());
+		curr_task(raw_smp_processor_id());
 
 	KDB_DEBUG_STATE("kdb_local 1", reason);
 
@@ -2278,7 +2268,7 @@ void kdb_ps_suppressed(void)
 	unsigned long cpu;
 	const struct task_struct *p, *g;
 	for_each_online_cpu(cpu) {
-		p = kdb_curr_task(cpu);
+		p = curr_task(cpu);
 		if (kdb_task_state(p, "-"))
 			++idle;
 	}
@@ -2314,7 +2304,7 @@ void kdb_ps1(const struct task_struct *p)
 		   kdb_task_has_cpu(p), kdb_process_cpu(p),
 		   kdb_task_state_char(p),
 		   (void *)(&p->thread),
-		   p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
+		   p == curr_task(raw_smp_processor_id()) ? '*' : ' ',
 		   p->comm);
 	if (kdb_task_has_cpu(p)) {
 		if (!KDB_TSK(cpu)) {
@@ -2350,7 +2340,7 @@ static int kdb_ps(int argc, const char **argv)
 	for_each_online_cpu(cpu) {
 		if (KDB_FLAG(CMD_INTERRUPT))
 			return 0;
-		p = kdb_curr_task(cpu);
+		p = curr_task(cpu);
 		if (kdb_task_state(p, mask))
 			kdb_ps1(p);
 	}

kernel/debug/kdb/kdb_private.h

@@ -210,8 +210,6 @@ extern void kdb_gdb_state_pass(char *buf);
 #define KDB_TSK(cpu) kgdb_info[cpu].task
 #define KDB_TSKREGS(cpu) kgdb_info[cpu].debuggerinfo
 
-extern struct task_struct *kdb_curr_task(int);
-
 #define kdb_task_has_cpu(p) (task_curr(p))
 
 #define GFP_KDB (in_dbg_master() ? GFP_ATOMIC : GFP_KERNEL)