mailbox: rockchip: avoid 64-bit division
authorArnd Bergmann <arnd@arndb.de>
Mon, 14 Mar 2016 22:46:55 +0000 (23:46 +0100)
committerJassi Brar <jaswinder.singh@linaro.org>
Wed, 16 Mar 2016 03:48:15 +0000 (09:18 +0530)
commitc5a9d1f30c066b7922a5f66b8c03a263d2f06a8c
tree33491c8c2837f03b7675effd7dabbbe1631a5301
parentf70ed3b5dc8b0810a01a24b198eca3f562aedc14
mailbox: rockchip: avoid 64-bit division

The newly added rockchip mailbox driver causes a bug in
the ARM allyesconfig build because of a division of a resource_size_t
variable that may be 64 bit wide:

drivers/mailbox/built-in.o: In function `rockchip_mbox_probe':
:(.text+0x6614): undefined reference to `__aeabi_uldivmod'

This adds a cast to size_t, which turns it into a 32-bit division
in this case. This is safe because we know that we cannot possibly
map a resource that is longer than what a pointer contains, and
in practice it will be very short instead.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
drivers/mailbox/rockchip-mailbox.c