[PATCH] use limited register constraint for setnz

[Steven Rostedt]

Impact: fix in compiling

GCC can decide to use %dil when "r" is used, which is not valid for
setnz.

This bug was brought out by Stephen Rothwell's merging of the
branch tracer into linux-next.

Signed-off-by: Steven Rostedt <srostedt@xxxxxxxxxx>

diff --git a/arch/x86/boot/tty.c b/arch/x86/boot/tty.c
index 0be77b3..c2121d2 100644
--- a/arch/x86/boot/tty.c
+++ b/arch/x86/boot/tty.c
@@ -74,7 +74,7 @@ static int kbd_pending(void)
 {
 	u8 pending;
 	asm volatile("int $0x16; setnz %0"
-		     : "=rm" (pending)
+		     : "=Qm" (pending)
 		     : "a" (0x0100));
 	return pending;
 }

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