Re: [PATCH 4/4] iommu/iova: Make dma_32bit_pfn implicit

From: kbuild test robot
Date: Wed Jul 19 2017 - 11:08:07 EST


Hi Zhen,

[auto build test WARNING on iommu/next]
[also build test WARNING on v4.13-rc1]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Robin-Murphy/Optimise-64-bit-IOVA-allocations/20170719-060847
base: https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git next
config: arm-multi_v7_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=arm

All warnings (new ones prefixed by >>):

drivers/iommu/iova.c: In function 'init_iova_domain':
>> drivers/iommu/iova.c:53:41: warning: large integer implicitly truncated to unsigned type [-Woverflow]
iovad->dma_32bit_pfn = iova_pfn(iovad, 1ULL << 32);
^~~~

vim +53 drivers/iommu/iova.c

35
36 void
37 init_iova_domain(struct iova_domain *iovad, unsigned long granule,
38 unsigned long start_pfn)
39 {
40 /*
41 * IOVA granularity will normally be equal to the smallest
42 * supported IOMMU page size; both *must* be capable of
43 * representing individual CPU pages exactly.
44 */
45 BUG_ON((granule > PAGE_SIZE) || !is_power_of_2(granule));
46
47 spin_lock_init(&iovad->iova_rbtree_lock);
48 iovad->rbroot = RB_ROOT;
49 iovad->cached_node = NULL;
50 iovad->cached32_node = NULL;
51 iovad->granule = granule;
52 iovad->start_pfn = start_pfn;
> 53 iovad->dma_32bit_pfn = iova_pfn(iovad, 1ULL << 32);
54 init_iova_rcaches(iovad);
55 }
56 EXPORT_SYMBOL_GPL(init_iova_domain);
57

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