linux-kernel - [PATCH 1/5] alpha: nautilus - fix compile failure with gcc-4.3

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Date:	Wed, 14 Jan 2009 17:32:28 +0300
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Daniel Drake <dsd@...too.org>, Richard Henderson <rth@...ddle.net>,
	Jay Estabrook <jay.estabrook@...com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] alpha: nautilus - fix compile failure with gcc-4.3

init_srm_irq() deals with irq's #16 and above, but size of irq_desc
array on nautilus and some other system types is 16. So gcc-4.3
complains that "array subscript is above array bounds", even though
this function is never called on those systems.

This adds a check for NR_IRQS <= 16, which effectively optimizes
init_srm_irq() code away on problematic platforms.

Thanks to Daniel Drake <dsd@...too.org> for detailed analysis
of the problem.

Signed-off-by: Ivan Kokshaysky <ink@...assic.park.msu.ru>
---
 arch/alpha/kernel/irq_srm.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/alpha/kernel/irq_srm.c b/arch/alpha/kernel/irq_srm.c
index 3221201..a03fbca 100644
--- a/arch/alpha/kernel/irq_srm.c
+++ b/arch/alpha/kernel/irq_srm.c
@@ -63,6 +63,8 @@ init_srm_irqs(long max, unsigned long ignore_mask)
 {
 	long i;
 
+	if (NR_IRQS <= 16)
+		return;
 	for (i = 16; i < max; ++i) {
 		if (i < 64 && ((ignore_mask >> i) & 1))
 			continue;
--
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