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devkbd: return multiple messages per /dev/kbd read (helps with high latency links)

--- a/kern/devkbd.c

+++ b/kern/devkbd.c

@@ -39,7 +39,7 @@

 static void

 kbdinit(void)

 {

-	keyq = qopen(4*1024, 0, 0, 0);

+	keyq = qopen(4*1024, Qcoalesce, 0, 0);

 	if(keyq == nil)

 		panic("kbdinit");

 	qnoblock(keyq, 1);