x86: use limited register constraint for setnz

Impact: build fix with certain compilers

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.

[ Thanks to Uros Bizjak for recommending 'q' over 'Q' ]

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/boot/tty.c b/arch/x86/boot/tty.c
index 0be77b39328afc957c8aa70b64bbe0641f477a7c..7e8e8b25f5f6c89defd0df4064a61e3e16a4ea06 100644 (file)
--- 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;
 }