From: Axel Lin <axel.lin@ingics.com>
Date: Fri, 5 Jul 2013 09:13:12 +0000 (+0800)
Subject: genirq: generic chip: Use DIV_ROUND_UP to calculate numchips
X-Git-Tag: v3.11-rc1~8^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=002fca5df168922103a2bb52748f9984e6de80b2;p=pandora-kernel.git

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 <axel.lin@ingics.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: http://lkml.kernel.org/r/1373015592.18252.2.camel@phoenix
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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