Linux 4.14.95

[thirdparty/kernel/stable-queue.git] / releases / 2.6.27.14 / alpha-nautilus-fix-compile-failure-with-gcc-4.3.patch

From 70b66cbfd3316b792a855cb9a2574e85f1a63d0f Mon Sep 17 00:00:00 2001
From: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Date: Thu, 15 Jan 2009 13:51:17 -0800
Subject: alpha: nautilus - fix compile failure with gcc-4.3

From: Ivan Kokshaysky <ink@jurassic.park.msu.ru>

commit 70b66cbfd3316b792a855cb9a2574e85f1a63d0f upstream.

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@gentoo.org> for detailed analysis
of the problem.

Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Tobias Klausmann <klausman@schwarzvogel.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 arch/alpha/kernel/irq_srm.c |    2 ++
 1 file changed, 2 insertions(+)

--- 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 ig
 {
 	long i;
 
+	if (NR_IRQS <= 16)
+		return;
 	for (i = 16; i < max; ++i) {
 		if (i < 64 && ((ignore_mask >> i) & 1))
 			continue;