kgdb: update outdated references to kgdb_wait()

The function kgdb_wait() was folded into the static function
kgdb_cpu_enter() by commit 62fae31 ("kgdb: eliminate
kgdb_wait(), all cpus enter the same way").  Update the four stale
references accordingly:

 - include/linux/kgdb.h and arch/x86/kernel/kgdb.c: the
   kgdb_roundup_cpus() kdoc describes what other CPUs are rounded up
   to call.  Because kgdb_cpu_enter() is static, the correct public
   entry point is kgdb_handle_exception(); also fix a pre-existing
   grammar error ("get them be" -> "get them into") and reflow the
   text.

 - kernel/debug/debug_core.c: replace with the generic description
   "the debug trap handler", since the actual entry path is
   architecture-specific.

 - kernel/debug/gdbstub.c: kgdb_cpu_enter() is correct here (it
   describes internal state, not a call target); add the missing
   parentheses.

Suggested-by: Daniel Thompson <[email protected]>
Assisted-by: unnamed:deepseek-v3.2 coccinelle
Signed-off-by: Kexin Sun <[email protected]>

Author: Kexin Sun

arch/x86/kernel/kgdb.c

@@ -407,10 +407,11 @@ static void kgdb_disable_hw_debug(struct pt_regs *regs)
  *	kgdb_roundup_cpus - Get other CPUs into a holding pattern
  *
  *	On SMP systems, we need to get the attention of the other CPUs
- *	and get them be in a known state.  This should do what is needed
- *	to get the other CPUs to call kgdb_wait(). Note that on some arches,
- *	the NMI approach is not used for rounding up all the CPUs. For example,
- *	in case of MIPS, smp_call_function() is used to roundup CPUs.
+ *	and get them into a known state.  This should do what is needed
+ *	to get the other CPUs to call kgdb_handle_exception().  Note that
+ *	on some arches, the NMI approach is not used for rounding up all
+ *	the CPUs.  For example, in case of MIPS, smp_call_function() is
+ *	used to roundup CPUs.
  *
  *	On non-SMP systems, this is not called.
  */

include/linux/kgdb.h

@@ -202,9 +202,10 @@ extern void kgdb_call_nmi_hook(void *ignored);
  *
  *	On SMP systems, we need to get the attention of the other CPUs
  *	and get them into a known state.  This should do what is needed
- *	to get the other CPUs to call kgdb_wait(). Note that on some arches,
- *	the NMI approach is not used for rounding up all the CPUs.  Normally
- *	those architectures can just not implement this and get the default.
+ *	to get the other CPUs to call kgdb_handle_exception().  Note that
+ *	on some arches, the NMI approach is not used for rounding up all
+ *	the CPUs.  Normally those architectures can just not implement
+ *	this and get the default.
  *
  *	On non-SMP systems, this is not called.
  */

kernel/debug/debug_core.c

@@ -704,7 +704,7 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs,
 	if (ks->send_ready)
 		atomic_set(ks->send_ready, 1);
 
-	/* Signal the other CPUs to enter kgdb_wait() */
+	/* Signal the other CPUs to enter the debug trap handler */
 	else if ((!kgdb_single_step) && kgdb_do_roundup)
 		kgdb_roundup_cpus();
 #endif

kernel/debug/gdbstub.c

@@ -517,7 +517,7 @@ static void gdb_get_regs_helper(struct kgdb_state *ks)
 	/*
 	 * All threads that don't have debuggerinfo should be
 	 * in schedule() sleeping, since all other CPUs
-	 * are in kgdb_wait, and thus have debuggerinfo.
+	 * are in kgdb_cpu_enter(), and thus have debuggerinfo.
 	 */
 	if (local_debuggerinfo) {
 		pt_regs_to_gdb_regs(gdb_regs, local_debuggerinfo);