Commit-ID: 002fca5df168922103a2bb52748f9984e6de80b2 Gitweb: http://git.kernel.org/tip/002fca5df168922103a2bb52748f9984e6de80b2 Author: Axel Lin <[email protected]> AuthorDate: Fri, 5 Jul 2013 17:13:12 +0800 Committer: Thomas Gleixner <[email protected]> CommitDate: Fri, 5 Jul 2013 11:39:25 +0200
genirq: generic chip: Use DIV_ROUND_UP to calculate numchips The number of interrupts in a domain may be not divisible by the number of interrupts each chip handles. Integer division may truncate the result, thus use DIV_ROUND_UP to count numchips. Seems all users of irq_alloc_domain_generic_chips() in current code do not have this issue. I just found the issue while reading the code. Signed-off-by: Axel Lin <[email protected]> Cc: Grant Likely <[email protected]> Cc: Tony Lindgren <[email protected]> Cc: Arnd Bergmann <[email protected]> Link: http://lkml.kernel.org/r/1373015592.18252.2.camel@phoenix Signed-off-by: Thomas Gleixner <[email protected]> --- kernel/irq/generic-chip.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c index 1c39ecc..2f274f3 100644 --- a/kernel/irq/generic-chip.c +++ b/kernel/irq/generic-chip.c @@ -278,7 +278,7 @@ int irq_alloc_domain_generic_chips(struct irq_domain *d, int irqs_per_chip, if (d->revmap_type != IRQ_DOMAIN_MAP_LINEAR) return -EINVAL; - numchips = d->revmap_data.linear.size / irqs_per_chip; + numchips = DIV_ROUND_UP(d->revmap_data.linear.size, irqs_per_chip); if (!numchips) return -EINVAL; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
