diff --git a/sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c b/sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c
--- a/sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c
@@ -472,7 +472,7 @@
 #define	DT_MASK_LO 0x00000000FFFFFFFFULL
 
 #define	DTRACE_STORE(type, tomax, offset, what) \
-	*((type *)((uintptr_t)(tomax) + (uintptr_t)offset)) = (type)(what);
+	*((type *)((uintptr_t)(tomax) + (size_t)offset)) = (type)(what);
 
 #if !defined(__x86) && !defined(__aarch64__)
 #define	DTRACE_ALIGNCHECK(addr, size, flags)				\
@@ -601,7 +601,7 @@
 static dtrace_helpers_t *dtrace_helpers_create(proc_t *);
 static void dtrace_buffer_drop(dtrace_buffer_t *);
 static int dtrace_buffer_consumed(dtrace_buffer_t *, hrtime_t when);
-static intptr_t dtrace_buffer_reserve(dtrace_buffer_t *, size_t, size_t,
+static ssize_t dtrace_buffer_reserve(dtrace_buffer_t *, size_t, size_t,
     dtrace_state_t *, dtrace_mstate_t *);
 static int dtrace_state_option(dtrace_state_t *, dtrace_optid_t,
     dtrace_optval_t);
@@ -2548,7 +2548,7 @@
 	caddr_t tomax, data, kdata;
 	dtrace_actkind_t action;
 	dtrace_action_t *act;
-	uintptr_t offs;
+	size_t offs;
 
 	if (buf == NULL)
 		return;
@@ -2843,7 +2843,7 @@
 	dtrace_buffer_t *src, *dest;
 	uintptr_t daddr, saddr, dlimit, slimit;
 	dtrace_speculation_state_t curstate, new = 0;
-	intptr_t offs;
+	ssize_t offs;
 	uint64_t timestamp;
 
 	if (which == 0)
@@ -6910,7 +6910,6 @@
 	char c[DTRACE_FULLNAMELEN + 80], *str;
 	char *msg = "dtrace: breakpoint action at probe ";
 	char *ecbmsg = " (ecb ";
-	uintptr_t mask = (0xf << (sizeof (uintptr_t) * NBBY / 4));
 	uintptr_t val = (uintptr_t)ecb;
 	int shift = (sizeof (uintptr_t) * NBBY) - 4, i = 0;
 
@@ -6951,9 +6950,9 @@
 		c[i++] = *ecbmsg++;
 
 	while (shift >= 0) {
-		mask = (uintptr_t)0xf << shift;
+		size_t mask = (size_t)0xf << shift;
 
-		if (val >= ((uintptr_t)1 << shift))
+		if (val >= ((size_t)1 << shift))
 			c[i++] = "0123456789abcdef"[(val & mask) >> shift];
 		shift -= 4;
 	}
@@ -8038,7 +8037,7 @@
 }
 
 static dtrace_hash_t *
-dtrace_hash_create(uintptr_t stroffs, uintptr_t nextoffs, uintptr_t prevoffs)
+dtrace_hash_create(size_t stroffs, size_t nextoffs, size_t prevoffs)
 {
 	dtrace_hash_t *hash = kmem_zalloc(sizeof (dtrace_hash_t), KM_SLEEP);
 
@@ -12316,11 +12315,11 @@
  * mstate.  Returns the new offset in the buffer, or a negative value if an
  * error has occurred.
  */
-static intptr_t
+static ssize_t
 dtrace_buffer_reserve(dtrace_buffer_t *buf, size_t needed, size_t align,
     dtrace_state_t *state, dtrace_mstate_t *mstate)
 {
-	intptr_t offs = buf->dtb_offset, soffs;
+	ssize_t offs = buf->dtb_offset, soffs;
 	intptr_t woffs;
 	caddr_t tomax;
 	size_t total;
diff --git a/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace_impl.h b/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace_impl.h
--- a/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace_impl.h
+++ b/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace_impl.h
@@ -149,9 +149,9 @@
 	int dth_size;				/* size of hash table */
 	int dth_mask;				/* mask to index into table */
 	int dth_nbuckets;			/* total number of buckets */
-	uintptr_t dth_nextoffs;			/* offset of next in probe */
-	uintptr_t dth_prevoffs;			/* offset of prev in probe */
-	uintptr_t dth_stroffs;			/* offset of str in probe */
+	size_t dth_nextoffs;			/* offset of next in probe */
+	size_t dth_prevoffs;			/* offset of prev in probe */
+	size_t dth_stroffs;			/* offset of str in probe */
 } dtrace_hash_t;
 
 /*