diff --git a/vp9/common/generic/vp9_systemdependent.c b/vp9/common/generic/vp9_systemdependent.c
index 79092cd0eb6020010328ae39c02c45ce4dbfcc78..f144721139e21ae11ba9ddd1156af59d5fa870ae 100644
--- a/vp9/common/generic/vp9_systemdependent.c
+++ b/vp9/common/generic/vp9_systemdependent.c
@@ -13,6 +13,7 @@
 #include "vp9_rtcd.h"
 #include "vp9/common/vp9_onyxc_int.h"
 
-void vp9_machine_specific_config(VP9_COMMON *ctx) {
+void vp9_machine_specific_config(VP9_COMMON *cm) {
+  (void)cm;
   vp9_rtcd();
 }
diff --git a/vp9/common/vp9_alloccommon.h b/vp9/common/vp9_alloccommon.h
index 90c691a6e4bad0ddc849624f3187aa382d510376..b7d7eba729d5d6ca6f3a2c8854ebfcf5b816e9d7 100644
--- a/vp9/common/vp9_alloccommon.h
+++ b/vp9/common/vp9_alloccommon.h
@@ -16,8 +16,8 @@
 
 void vp9_initialize_common();
 
-void vp9_update_mode_info_border(VP9_COMMON *cpi, MODE_INFO *mi);
-void vp9_update_mode_info_in_image(VP9_COMMON *cpi, MODE_INFO *mi);
+void vp9_update_mode_info_border(VP9_COMMON *cm, MODE_INFO *mi);
+void vp9_update_mode_info_in_image(VP9_COMMON *cm, MODE_INFO *mi);
 
 void vp9_create_common(VP9_COMMON *cm);
 void vp9_remove_common(VP9_COMMON *cm);
diff --git a/vp9/common/vp9_debugmodes.c b/vp9/common/vp9_debugmodes.c
index a8f282a88e90f0087b85571944ad9c406af4b22d..4de50aacfb8a1c48b4484e181e8623e63f3abd61 100644
--- a/vp9/common/vp9_debugmodes.c
+++ b/vp9/common/vp9_debugmodes.c
@@ -22,17 +22,17 @@ static void log_frame_info(VP9_COMMON *cm, const char *str, FILE *f) {
  * and uses the passed in member offset to print out the value of an integer
  * for each mbmi member value in the mi structure.
  */
-static void print_mi_data(VP9_COMMON *common, FILE *file, char *descriptor,
+static void print_mi_data(VP9_COMMON *cm, FILE *file, char *descriptor,
                           size_t member_offset) {
   int mi_row;
   int mi_col;
   int mi_index = 0;
-  MODE_INFO *mi = common->mi;
-  int rows = common->mi_rows;
-  int cols = common->mi_cols;
+  MODE_INFO *mi = cm->mi;
+  int rows = cm->mi_rows;
+  int cols = cm->mi_cols;
   char prefix = descriptor[0];
 
-  log_frame_info(common, descriptor, file);
+  log_frame_info(cm, descriptor, file);
   mi_index = 0;
   for (mi_row = 0; mi_row < rows; mi_row++) {
     fprintf(file, "%c ", prefix);
diff --git a/vp9/common/vp9_entropy.h b/vp9/common/vp9_entropy.h
index 2da613a56088ede9f7b12eaf1fcfcebdd00f8d4f..699b44afbe184897cca120d583ef7bb273f1416d 100644
--- a/vp9/common/vp9_entropy.h
+++ b/vp9/common/vp9_entropy.h
@@ -95,7 +95,7 @@ typedef vp9_prob vp9_coeff_probs[REF_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS]
 #define MODULUS_PARAM               13  /* Modulus parameter */
 
 struct VP9Common;
-void vp9_default_coef_probs(struct VP9Common *);
+void vp9_default_coef_probs(struct VP9Common *cm);
 extern DECLARE_ALIGNED(16, const int16_t, vp9_default_scan_4x4[16]);
 
 extern DECLARE_ALIGNED(16, const int16_t, vp9_col_scan_4x4[16]);
@@ -154,7 +154,7 @@ extern DECLARE_ALIGNED(16, int16_t,
                        vp9_default_scan_32x32_neighbors[1025 * MAX_NEIGHBORS]);
 
 void vp9_coef_tree_initialize(void);
-void vp9_adapt_coef_probs(struct VP9Common *);
+void vp9_adapt_coef_probs(struct VP9Common *cm);
 
 static INLINE void reset_skip_context(MACROBLOCKD *xd, BLOCK_SIZE bsize) {
   int i;
diff --git a/vp9/common/vp9_entropymode.h b/vp9/common/vp9_entropymode.h
index 2f8085df666043229af3182555bd765d92084e0c..4cf4c0392fc7ce238d016efe67d12342b342ecaa 100644
--- a/vp9/common/vp9_entropymode.h
+++ b/vp9/common/vp9_entropymode.h
@@ -58,9 +58,9 @@ void vp9_entropy_mode_init();
 
 void vp9_setup_past_independence(struct VP9Common *cm);
 
-void vp9_init_mbmode_probs(struct VP9Common *x);
+void vp9_init_mbmode_probs(struct VP9Common *cm);
 
-void vp9_adapt_mode_probs(struct VP9Common *);
+void vp9_adapt_mode_probs(struct VP9Common *cm);
 
 void tx_counts_to_branch_counts_32x32(unsigned int *tx_count_32x32p,
                                       unsigned int (*ct_32x32p)[2]);
diff --git a/vp9/common/vp9_systemdependent.h b/vp9/common/vp9_systemdependent.h
index 1b9147ef4f93b844ab847dec74da15bfd7c95cc5..cc909e23e1e60836f74f92a5f96a332db67e1dcf 100644
--- a/vp9/common/vp9_systemdependent.h
+++ b/vp9/common/vp9_systemdependent.h
@@ -34,6 +34,6 @@ static int round(double x) {
 #endif
 
 struct VP9Common;
-void vp9_machine_specific_config(struct VP9Common *);
+void vp9_machine_specific_config(struct VP9Common *cm);
 
 #endif  // VP9_COMMON_VP9_SYSTEMDEPENDENT_H_
diff --git a/vp9/encoder/vp9_bitstream.c b/vp9/encoder/vp9_bitstream.c
index a2fd9c8c8534b94a61cf2879784da186434e432b..1582e380d4012c66588f79ba9f1066b42d0487df 100644
--- a/vp9/encoder/vp9_bitstream.c
+++ b/vp9/encoder/vp9_bitstream.c
@@ -533,11 +533,11 @@ static void pack_inter_mode_mvs(VP9_COMP *cpi, MODE_INFO *m, vp9_writer *bc) {
 
 static void write_mb_modes_kf(const VP9_COMP *cpi, MODE_INFO *m,
                               vp9_writer *bc) {
-  const VP9_COMMON *const c = &cpi->common;
+  const VP9_COMMON *const cm = &cpi->common;
   const MACROBLOCKD *const xd = &cpi->mb.e_mbd;
-  const struct segmentation *const seg = &c->seg;
+  const struct segmentation *const seg = &cm->seg;
   const int ym = m->mbmi.mode;
-  const int mis = c->mode_info_stride;
+  const int mis = cm->mode_info_stride;
   const int segment_id = m->mbmi.segment_id;
 
   if (seg->update_map)
@@ -545,7 +545,7 @@ static void write_mb_modes_kf(const VP9_COMP *cpi, MODE_INFO *m,
 
   write_skip_coeff(cpi, segment_id, m, bc);
 
-  if (m->mbmi.sb_type >= BLOCK_8X8 && c->tx_mode == TX_MODE_SELECT)
+  if (m->mbmi.sb_type >= BLOCK_8X8 && cm->tx_mode == TX_MODE_SELECT)
     write_selected_tx_size(cpi, m->mbmi.tx_size, m->mbmi.sb_type, bc);
 
   if (m->mbmi.sb_type >= BLOCK_8X8) {
@@ -684,18 +684,18 @@ static void write_modes_sb(VP9_COMP *cpi, MODE_INFO *m, vp9_writer *bc,
 
 static void write_modes(VP9_COMP *cpi, vp9_writer* const bc,
                         TOKENEXTRA **tok, TOKENEXTRA *tok_end) {
-  VP9_COMMON *const c = &cpi->common;
-  const int mis = c->mode_info_stride;
-  MODE_INFO *m, *m_ptr = c->mi;
+  VP9_COMMON *const cm = &cpi->common;
+  const int mis = cm->mode_info_stride;
+  MODE_INFO *m, *m_ptr = cm->mi;
   int mi_row, mi_col;
 
-  m_ptr += c->cur_tile_mi_col_start + c->cur_tile_mi_row_start * mis;
+  m_ptr += cm->cur_tile_mi_col_start + cm->cur_tile_mi_row_start * mis;
 
-  for (mi_row = c->cur_tile_mi_row_start; mi_row < c->cur_tile_mi_row_end;
+  for (mi_row = cm->cur_tile_mi_row_start; mi_row < cm->cur_tile_mi_row_end;
        mi_row += 8, m_ptr += 8 * mis) {
     m = m_ptr;
-    vp9_zero(c->left_seg_context);
-    for (mi_col = c->cur_tile_mi_col_start; mi_col < c->cur_tile_mi_col_end;
+    vp9_zero(cm->left_seg_context);
+    for (mi_col = cm->cur_tile_mi_col_start; mi_col < cm->cur_tile_mi_col_end;
          mi_col += MI_BLOCK_SIZE, m += MI_BLOCK_SIZE)
       write_modes_sb(cpi, m, bc, tok, tok_end, mi_row, mi_col, BLOCK_64X64);
   }
diff --git a/vp9/encoder/vp9_modecosts.c b/vp9/encoder/vp9_modecosts.c
index 5b236530832b4c045c0a2e5ada4f198e2132c48a..a5dfaed0c751eea4d774d5d57354bee6a47e8c3f 100644
--- a/vp9/encoder/vp9_modecosts.c
+++ b/vp9/encoder/vp9_modecosts.c
@@ -16,7 +16,7 @@
 
 
 void vp9_init_mode_costs(VP9_COMP *c) {
-  VP9_COMMON *x = &c->common;
+  VP9_COMMON *const cm = &c->common;
   const vp9_tree_p KT = vp9_intra_mode_tree;
   int i, j;
 
@@ -28,16 +28,16 @@ void vp9_init_mode_costs(VP9_COMP *c) {
   }
 
   // TODO(rbultje) separate tables for superblock costing?
-  vp9_cost_tokens(c->mb.mbmode_cost, x->fc.y_mode_prob[1],
+  vp9_cost_tokens(c->mb.mbmode_cost, cm->fc.y_mode_prob[1],
                   vp9_intra_mode_tree);
   vp9_cost_tokens(c->mb.intra_uv_mode_cost[1],
-                  x->fc.uv_mode_prob[INTRA_MODES - 1], vp9_intra_mode_tree);
+                  cm->fc.uv_mode_prob[INTRA_MODES - 1], vp9_intra_mode_tree);
   vp9_cost_tokens(c->mb.intra_uv_mode_cost[0],
                   vp9_kf_uv_mode_prob[INTRA_MODES - 1],
                   vp9_intra_mode_tree);
 
   for (i = 0; i <= SWITCHABLE_FILTERS; ++i)
     vp9_cost_tokens((int *)c->mb.switchable_interp_costs[i],
-                    x->fc.switchable_interp_prob[i],
+                    cm->fc.switchable_interp_prob[i],
                     vp9_switchable_interp_tree);
 }