arm64/smp: Drop the macro S(x,s)

Mapping between IPI type index and its string is direct without requiring
an additional offset. Hence the existing macro S(x, s) is now redundant
and can just be dropped. This also makes the code clean and simple.
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Link: https://lore.kernel.org/r/1604921916-23368-1-git-send-email-anshuman.khandual@arm.comSigned-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/kernel/smp.c

@@ -786,14 +786,13 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 }
 
 static const char *ipi_types[NR_IPI] __tracepoint_string = {
-#define S(x,s)	[x] = s
-	S(IPI_RESCHEDULE, "Rescheduling interrupts"),
-	S(IPI_CALL_FUNC, "Function call interrupts"),
-	S(IPI_CPU_STOP, "CPU stop interrupts"),
-	S(IPI_CPU_CRASH_STOP, "CPU stop (for crash dump) interrupts"),
-	S(IPI_TIMER, "Timer broadcast interrupts"),
-	S(IPI_IRQ_WORK, "IRQ work interrupts"),
-	S(IPI_WAKEUP, "CPU wake-up interrupts"),
+	[IPI_RESCHEDULE]	= "Rescheduling interrupts",
+	[IPI_CALL_FUNC]		= "Function call interrupts",
+	[IPI_CPU_STOP]		= "CPU stop interrupts",
+	[IPI_CPU_CRASH_STOP]	= "CPU stop (for crash dump) interrupts",
+	[IPI_TIMER]		= "Timer broadcast interrupts",
+	[IPI_IRQ_WORK]		= "IRQ work interrupts",
+	[IPI_WAKEUP]		= "CPU wake-up interrupts",
 };
 
 static void smp_cross_call(const struct cpumask *target, unsigned int ipinr);