linux-kernel - [PATCH] use limited register constraint for setnz

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Message-ID: <alpine.DEB.1.10.0811250040060.2977@gandalf.stny.rr.com>
Date:	Tue, 25 Nov 2008 00:42:37 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	LKML <linux-kernel@...r.kernel.org>
cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org
Subject: [PATCH] use limited register constraint for setnz


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@...hat.com>

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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