D19745.diff
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	Index: head/sys/arm/broadcom/bcm2835/bcm2835_sdhci.c
	===================================================================
	--- head/sys/arm/broadcom/bcm2835/bcm2835_sdhci.c
	+++ head/sys/arm/broadcom/bcm2835/bcm2835_sdhci.c
	@@ -66,8 +66,17 @@
	#define NUM_DMA_SEGS 2

	#ifdef DEBUG
	-#define dprintf(fmt, args...) do { printf("%s(): ", __func__); \
	- printf(fmt,##args); } while (0)
	+static int bcm2835_sdhci_debug = 0;
	+
	+TUNABLE_INT("hw.bcm2835.sdhci.debug", &bcm2835_sdhci_debug);
	+SYSCTL_INT(_hw_sdhci, OID_AUTO, bcm2835_sdhci_debug, CTLFLAG_RWTUN,
	+ &bcm2835_sdhci_debug, 0, "bcm2835 SDHCI debug level");
	+
	+#define dprintf(fmt, args...) \
	+ do { \
	+ if (bcm2835_sdhci_debug) \
	+ printf("%s: " fmt, __func__, ##args); \
	+ } while (0)
	#else
	#define dprintf(fmt, args...)
	#endif