MIPS: mm: Move drop_mmu_context() comment into appropriate block

drop_mmu_context() is preceded by a comment indicating what happens if
the mm provided is currently active on the local CPU. Move that comment
into the block that executes in this case, adjusting slightly to reflect
its new location.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org

arch/mips/include/asm/mmu_context.h

@@ -173,10 +173,6 @@ static inline void destroy_context(struct mm_struct *mm)
 #define activate_mm(prev, next)	switch_mm(prev, next, current)
 #define deactivate_mm(tsk, mm)	do { } while (0)
 
-/*
- * If mm is currently active_mm, we can't really drop it.  Instead,
- * we will get a new one for it.
- */
 static inline void
 drop_mmu_context(struct mm_struct *mm)
 {
@@ -189,6 +185,10 @@ drop_mmu_context(struct mm_struct *mm)
 	if (!cpu_context(cpu, mm)) {
 		/* no-op */
 	} else if (cpumask_test_cpu(cpu, mm_cpumask(mm))) {
+		/*
+		 * mm is currently active, so we can't really drop it.
+		 * Instead we bump the ASID.
+		 */
 		htw_stop();
 		get_new_mmu_context(mm);
 		write_c0_entryhi(cpu_asid(cpu, mm));