riscv: misaligned: move emulated access uniformity check in a function

Split the code that check for the uniformity of misaligned accesses
performance on all cpus from check_unaligned_access_emulated_all_cpus()
to its own function which will be used for delegation check. No
functional changes intended.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Tested-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20250523101932.1594077-10-cleger@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>

Author: clementleger

arch/riscv/kernel/traps_misaligned.c

@@ -645,6 +645,18 @@ bool __init check_vector_unaligned_access_emulated_all_cpus(void)
 }
 #endif
 
+static bool all_cpus_unaligned_scalar_access_emulated(void)
+{
+	int cpu;
+
+	for_each_online_cpu(cpu)
+		if (per_cpu(misaligned_access_speed, cpu) !=
+		    RISCV_HWPROBE_MISALIGNED_SCALAR_EMULATED)
+			return false;
+
+	return true;
+}
+
 #ifdef CONFIG_RISCV_SCALAR_MISALIGNED
 
 static bool unaligned_ctl __read_mostly;
@@ -683,19 +695,15 @@ static int cpu_online_check_unaligned_access_emulated(unsigned int cpu)
 
 bool __init check_unaligned_access_emulated_all_cpus(void)
 {
-	int cpu;
-
 	/*
 	 * We can only support PR_UNALIGN controls if all CPUs have misaligned
 	 * accesses emulated since tasks requesting such control can run on any
 	 * CPU.
 	 */
 	on_each_cpu(check_unaligned_access_emulated, NULL, 1);
 
-	for_each_online_cpu(cpu)
-		if (per_cpu(misaligned_access_speed, cpu)
-		    != RISCV_HWPROBE_MISALIGNED_SCALAR_EMULATED)
-			return false;
+	if (!all_cpus_unaligned_scalar_access_emulated())
+		return false;
 
 	unaligned_ctl = true;
 	return true;