linux-kernel - [PATCH] x86, irq Fix kbuild warning in smp_irq_move_cleanup

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Date:	Mon, 13 Jan 2014 08:40:20 -0500
From:	Prarit Bhargava <prarit@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Prarit Bhargava <prarit@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
	Joerg Roedel <joro@...tes.org>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: [PATCH] x86, irq Fix kbuild warning in smp_irq_move_cleanup_interrupt()

kbuild, 0day kernel build service, outputs the warning:

arch/x86/kernel/apic/io_apic.c:2211 smp_irq_move_cleanup_interrupt() warn:
always true condition '(irq <= -1) => (0-u32max <= (-1))'

because irq is defined as an unsigned int instead of an int.  Fix this
trivial error by redefining irq as a signed int.  The remaining consumers of the
int are okay.

Signed-off-by: Prarit Bhargava <prarit@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Fengguang Wu <fengguang.wu@...el.com>
---
 arch/x86/kernel/apic/io_apic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index e63a5bd..c4db751 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2202,7 +2202,7 @@ asmlinkage void smp_irq_move_cleanup_interrupt(void)
 
 	me = smp_processor_id();
 	for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
-		unsigned int irq;
+		int irq;
 		unsigned int irr;
 		struct irq_desc *desc;
 		struct irq_cfg *cfg;
-- 
1.7.9.3

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