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@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>

diff --git a/arch/alpha/kernel/irq_srm.c b/arch/alpha/kernel/irq_srm.c
index 32212014fbe91632e9bb80b5307725d16e758d1a..a03fbca4940eb0d0881b4d197cd3e84a3cf2b68a 100644 (file)
--- 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;