diff --git a/vp9/common/vp9_blockd.h b/vp9/common/vp9_blockd.h
index ff047b88aa7f51bdbb645676cd4d98cb78a749a9..d0d485272ef1cb01118b99f70536d3aa912d4d23 100644
--- a/vp9/common/vp9_blockd.h
+++ b/vp9/common/vp9_blockd.h
@@ -417,7 +417,7 @@ static void txfrm_block_to_raster_xy(BLOCK_SIZE plane_bsize,
   *y = (raster_mb >> tx_cols_log2) << tx_size;
 }
 
-static void extend_for_intra(MACROBLOCKD* const xd, BLOCK_SIZE plane_bsize,
+static void extend_for_intra(MACROBLOCKD *xd, BLOCK_SIZE plane_bsize,
                              int plane, int block, TX_SIZE tx_size) {
   struct macroblockd_plane *const pd = &xd->plane[plane];
   uint8_t *const buf = pd->dst.buf;
@@ -457,7 +457,7 @@ static void extend_for_intra(MACROBLOCKD* const xd, BLOCK_SIZE plane_bsize,
     }
   }
 }
-static void set_contexts_on_border(MACROBLOCKD *xd,
+static void set_contexts_on_border(const MACROBLOCKD *xd,
                                    struct macroblockd_plane *pd,
                                    BLOCK_SIZE plane_bsize,
                                    int tx_size_in_blocks, int has_eob,
@@ -495,7 +495,7 @@ static void set_contexts_on_border(MACROBLOCKD *xd,
     L[pt] = 0;
 }
 
-static void set_contexts(MACROBLOCKD *xd, struct macroblockd_plane *pd,
+static void set_contexts(const MACROBLOCKD *xd, struct macroblockd_plane *pd,
                          BLOCK_SIZE plane_bsize, TX_SIZE tx_size,
                          int has_eob, int aoff, int loff) {
   ENTROPY_CONTEXT *const A = pd->above_context + aoff;
diff --git a/vp9/common/vp9_entropy.h b/vp9/common/vp9_entropy.h
index ec7d09a00b0e67934773b5848b68c74d4729e71f..c58e852fe18e403d6650e1855363e6f4df3db1b5 100644
--- a/vp9/common/vp9_entropy.h
+++ b/vp9/common/vp9_entropy.h
@@ -153,8 +153,8 @@ typedef unsigned int vp9_coeff_count_model[REF_TYPES][COEF_BANDS]
 
 void vp9_model_to_full_probs(const vp9_prob *model, vp9_prob *full);
 
-static int get_entropy_context(TX_SIZE tx_size,
-                               ENTROPY_CONTEXT *a, ENTROPY_CONTEXT *l) {
+static int get_entropy_context(TX_SIZE tx_size, const ENTROPY_CONTEXT *a,
+                                                const ENTROPY_CONTEXT *l) {
   ENTROPY_CONTEXT above_ec = 0, left_ec = 0;
 
   switch (tx_size) {
@@ -163,16 +163,16 @@ static int get_entropy_context(TX_SIZE tx_size,
       left_ec = l[0] != 0;
       break;
     case TX_8X8:
-      above_ec = !!*(uint16_t *)a;
-      left_ec  = !!*(uint16_t *)l;
+      above_ec = !!*(const uint16_t *)a;
+      left_ec  = !!*(const uint16_t *)l;
       break;
     case TX_16X16:
-      above_ec = !!*(uint32_t *)a;
-      left_ec  = !!*(uint32_t *)l;
+      above_ec = !!*(const uint32_t *)a;
+      left_ec  = !!*(const uint32_t *)l;
       break;
     case TX_32X32:
-      above_ec = !!*(uint64_t *)a;
-      left_ec  = !!*(uint64_t *)l;
+      above_ec = !!*(const uint64_t *)a;
+      left_ec  = !!*(const uint64_t *)l;
       break;
     default:
       assert(!"Invalid transform size.");
diff --git a/vp9/common/vp9_reconintra.c b/vp9/common/vp9_reconintra.c
index bd609dcf0d43ca387c9c2ad1bfe540b4c3dd3d29..eb643b09089a8c2bcb2e5ce15507fc859507d44a 100644
--- a/vp9/common/vp9_reconintra.c
+++ b/vp9/common/vp9_reconintra.c
@@ -369,7 +369,7 @@ static void build_intra_predictors(const uint8_t *ref, int ref_stride,
   }
 }
 
-void vp9_predict_intra_block(MACROBLOCKD *xd, int block_idx, int bwl_in,
+void vp9_predict_intra_block(const MACROBLOCKD *xd, int block_idx, int bwl_in,
                             TX_SIZE tx_size, int mode,
                             const uint8_t *ref, int ref_stride,
                             uint8_t *dst, int dst_stride) {
diff --git a/vp9/common/vp9_reconintra.h b/vp9/common/vp9_reconintra.h
index e9d0dbf04cf2c76fe81119b6f3df5edf3a3555f5..6e3f55c4d83e1c533ecc3cfaf53adbf1a5dd6777 100644
--- a/vp9/common/vp9_reconintra.h
+++ b/vp9/common/vp9_reconintra.h
@@ -14,8 +14,8 @@
 #include "vpx/vpx_integer.h"
 #include "vp9/common/vp9_blockd.h"
 
-void vp9_predict_intra_block(MACROBLOCKD *xd, int block_idx, int bwl_in,
-                            TX_SIZE tx_size, int mode,
-                            const uint8_t *ref, int ref_stride,
-                            uint8_t *dst, int dst_stride);
+void vp9_predict_intra_block(const MACROBLOCKD *xd, int block_idx, int bwl_in,
+                             TX_SIZE tx_size, int mode,
+                             const uint8_t *ref, int ref_stride,
+                             uint8_t *dst, int dst_stride);
 #endif  // VP9_COMMON_VP9_RECONINTRA_H_
diff --git a/vp9/common/vp9_scan.h b/vp9/common/vp9_scan.h
index a5c8463d5711be942da0553d14cf17c6da4663ac..14a1a7eb02fd8d7b4b598865bbc25caea92233d4 100644
--- a/vp9/common/vp9_scan.h
+++ b/vp9/common/vp9_scan.h
@@ -191,8 +191,7 @@ static INLINE const int16_t* get_iscan_16x16(TX_TYPE tx_type) {
 }
 
 static INLINE int get_coef_context(const int16_t *neighbors,
-                                   uint8_t *token_cache,
-                                   int c) {
+                                   const uint8_t *token_cache, int c) {
   return (1 + token_cache[neighbors[MAX_NEIGHBORS * c + 0]] +
           token_cache[neighbors[MAX_NEIGHBORS * c + 1]]) >> 1;
 }
diff --git a/vp9/encoder/vp9_subexp.c b/vp9/encoder/vp9_subexp.c
index eb864d96cb5c6983c692e1e01740504387412aa7..387fc9056b5916fca6599cb2e9f56f9d8e45e40b 100644
--- a/vp9/encoder/vp9_subexp.c
+++ b/vp9/encoder/vp9_subexp.c
@@ -221,7 +221,7 @@ int vp9_prob_diff_update_savings_search_model(const unsigned int *ct,
 }
 
 void vp9_cond_prob_diff_update(vp9_writer *w, vp9_prob *oldp,
-                               unsigned int *ct) {
+                               const unsigned int ct[2]) {
   const vp9_prob upd = DIFF_UPDATE_PROB;
   vp9_prob newp = get_binary_prob(ct[0], ct[1]);
   const int savings = vp9_prob_diff_update_savings_search(ct, *oldp, &newp,