[PATCH] m32r: Should index be positive?

[Roel Kluin <roel.kluin@gmail.com>]

Index `ipi_num' is signed, test whether it is negative to
make sure we don't get a negative array element.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
---
 arch/m32r/kernel/smp.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

Found by code analysis, is it required?

diff --git a/arch/m32r/kernel/smp.c b/arch/m32r/kernel/smp.c
index 8a88f1f..31cef20 100644
--- a/arch/m32r/kernel/smp.c
+++ b/arch/m32r/kernel/smp.c
@@ -806,7 +806,7 @@ unsigned long send_IPI_mask_phys(cpumask_t physid_mask, int ipi_num,
 
 	if (mask & ~physids_coerce(phys_cpu_present_map))
 		BUG();
-	if (ipi_num >= NR_IPIS)
+	if (ipi_num >= NR_IPIS || ipi_num < 0)
 		BUG();
 
 	mask <<= IPI_SHIFT;