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 <[email protected]> --- drivers/mailbox/rockchip-mailbox.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mailbox/rockchip-mailbox.c b/drivers/mailbox/rockchip-mailbox.c index b79a2871227c..d702a204f5c1 100644 --- a/drivers/mailbox/rockchip-mailbox.c +++ b/drivers/mailbox/rockchip-mailbox.c @@ -213,7 +213,7 @@ static int rockchip_mbox_probe(struct platform_device *pdev) return PTR_ERR(mb->mbox_base); /* Each channel has two buffers for A2B and B2A */ - mb->buf_size = resource_size(res) / (drv_data->num_chans * 2); + mb->buf_size = (size_t)resource_size(res) / (drv_data->num_chans * 2); mb->pclk = devm_clk_get(&pdev->dev, "pclk_mailbox"); if (IS_ERR(mb->pclk)) { -- 2.7.0
