ARC: update some comments

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

2 files changed, 9 insertions, 5 deletions

diff --git a/arch/arc/kernel/time.c b/arch/arc/kernel/time.c
index f92cfb14ecd3..dbe74f418019 100644
--- a/arch/arc/kernel/time.c
+++ b/arch/arc/kernel/time.c
@@ -144,12 +144,12 @@ static struct clocksource arc_counter = {
 /********** Clock Event Device *********/
 
 /*
- * Arm the timer to interrupt after @limit cycles
+ * Arm the timer to interrupt after @cycles
  * The distinction for oneshot/periodic is done in arc_event_timer_ack() below
  */
-static void arc_timer_event_setup(unsigned int limit)
+static void arc_timer_event_setup(unsigned int cycles)
 {
-        write_aux_reg(ARC_REG_TIMER0_LIMIT, limit);
+        write_aux_reg(ARC_REG_TIMER0_LIMIT, cycles);
         write_aux_reg(ARC_REG_TIMER0_CNT, 0);   /* start from 0 */
 
         write_aux_reg(ARC_REG_TIMER0_CTRL, TIMER_CTRL_IE | TIMER_CTRL_NH);
@@ -168,6 +168,10 @@ static void arc_clkevent_set_mode(enum clock_event_mode mode,
 {
         switch (mode) {
         case CLOCK_EVT_MODE_PERIODIC:
+                /*
+                 * At X Hz, 1 sec = 1000ms -> X cycles;
+                 *                    10ms -> X / 100 cycles
+                 */
                 arc_timer_event_setup(arc_get_core_freq() / HZ);
                 break;
         case CLOCK_EVT_MODE_ONESHOT:
diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S
index 79bfc81358c9..d572f1c2c724 100644
--- a/arch/arc/mm/tlbex.S
+++ b/arch/arc/mm/tlbex.S
@@ -220,9 +220,9 @@ ex_saved_reg1:
 
 .macro CONV_PTE_TO_TLB
         and    r3, r0, PTE_BITS_RWX     ;       r w x
-        lsl    r2, r3, 3                ; r w x 0 0 0
+        lsl    r2, r3, 3                ; r w x 0 0 0 (GLOBAL, kernel only)
         and.f  0,  r0, _PAGE_GLOBAL
-        or.z   r2, r2, r3               ; r w x r w x
+        or.z   r2, r2, r3               ; r w x r w x (!GLOBAL, user page)
 
         and r3, r0, PTE_BITS_NON_RWX_IN_PD1 ; Extract PFN+cache bits from PTE
         or  r3, r3, r2