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diff --git a/sys/arm/arm/busdma_machdep.c b/sys/arm/arm/busdma_machdep.c
--- a/sys/arm/arm/busdma_machdep.c
+++ b/sys/arm/arm/busdma_machdep.c
@@ -398,6 +398,10 @@
/* Return a NULL tag on failure */
*dmat = NULL;
+ /* Filters are deprecated, emit a warning. */
+ if (filter != NULL || filterarg != NULL)
+ printf("Warning: use of filters is deprecated; see busdma(9)\n");
+
newtag = (bus_dma_tag_t)malloc(sizeof(*newtag), M_BUSDMA,
M_ZERO | M_NOWAIT);
if (newtag == NULL) {
diff --git a/sys/arm64/arm64/busdma_machdep.c b/sys/arm64/arm64/busdma_machdep.c
--- a/sys/arm64/arm64/busdma_machdep.c
+++ b/sys/arm64/arm64/busdma_machdep.c
@@ -161,6 +161,10 @@
struct bus_dma_tag_common *tc;
int error;
+ /* Filters are deprecated, emit a warning. */
+ if (filter != NULL || filterarg != NULL)
+ printf("Warning: use of filters is deprecated; see busdma(9)\n");
+
if (parent == NULL) {
error = bus_dma_bounce_impl.tag_create(parent, alignment,
boundary, lowaddr, highaddr, filter, filterarg, maxsize,
diff --git a/sys/powerpc/powerpc/busdma_machdep.c b/sys/powerpc/powerpc/busdma_machdep.c
--- a/sys/powerpc/powerpc/busdma_machdep.c
+++ b/sys/powerpc/powerpc/busdma_machdep.c
@@ -168,6 +168,10 @@
return (EINVAL);
}
+ /* Filters are deprecated, emit a warning. */
+ if (filter != NULL || filterarg != NULL)
+ printf("Warning: use of filters is deprecated; see busdma(9)\n");
+
/* Return a NULL tag on failure */
*dmat = NULL;
diff --git a/sys/riscv/riscv/busdma_machdep.c b/sys/riscv/riscv/busdma_machdep.c
--- a/sys/riscv/riscv/busdma_machdep.c
+++ b/sys/riscv/riscv/busdma_machdep.c
@@ -162,6 +162,10 @@
struct bus_dma_tag_common *tc;
int error;
+ /* Filters are deprecated, emit a warning. */
+ if (filter != NULL || filterarg != NULL)
+ printf("Warning: use of filters is deprecated; see busdma(9)\n");
+
if (parent == NULL) {
error = bus_dma_bounce_impl.tag_create(parent, alignment,
boundary, lowaddr, highaddr, filter, filterarg, maxsize,
diff --git a/sys/x86/x86/busdma_machdep.c b/sys/x86/x86/busdma_machdep.c
--- a/sys/x86/x86/busdma_machdep.c
+++ b/sys/x86/x86/busdma_machdep.c
@@ -184,6 +184,10 @@
struct bus_dma_tag_common *tc;
int error;
+ /* Filters are deprecated, emit a warning. */
+ if (filter != NULL || filterarg != NULL)
+ printf("Warning: use of filters is deprecated; see busdma(9)\n");
+
if (parent == NULL) {
error = bus_dma_bounce_impl.tag_create(parent, alignment,
boundary, lowaddr, highaddr, filter, filterarg, maxsize,

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