linux-kernel - drivers/vdpa/vdpa_user/iova_domain.c:305 vduse_domain_alloc_iova() warn: should 'iova

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Date:   Wed, 19 Jan 2022 07:44:03 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     kbuild@...ts.01.org, Xie Yongji <xieyongji@...edance.com>
Cc:     lkp@...el.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>
Subject: drivers/vdpa/vdpa_user/iova_domain.c:305 vduse_domain_alloc_iova()
 warn: should 'iova_pfn << shift' be a 64 bit type?

Hi Xie,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   79e06c4c4950be2abd8ca5d2428a8c915aa62c24
commit: c8a6153b6c59d95c0e091f053f6f180952ade91e vduse: Introduce VDUSE - vDPA Device in Userspace
config: arm-randconfig-m031-20220116 (https://download.01.org/0day-ci/archive/20220117/202201171409.rqbXNHlz-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>

smatch warnings:
drivers/vdpa/vdpa_user/iova_domain.c:305 vduse_domain_alloc_iova() warn: should 'iova_pfn << shift' be a 64 bit type?

vim +305 drivers/vdpa/vdpa_user/iova_domain.c

8c773d53fb7b64 Xie Yongji 2021-08-31  287  static dma_addr_t
8c773d53fb7b64 Xie Yongji 2021-08-31  288  vduse_domain_alloc_iova(struct iova_domain *iovad,
8c773d53fb7b64 Xie Yongji 2021-08-31  289  			unsigned long size, unsigned long limit)
8c773d53fb7b64 Xie Yongji 2021-08-31  290  {
8c773d53fb7b64 Xie Yongji 2021-08-31  291  	unsigned long shift = iova_shift(iovad);
8c773d53fb7b64 Xie Yongji 2021-08-31  292  	unsigned long iova_len = iova_align(iovad, size) >> shift;
8c773d53fb7b64 Xie Yongji 2021-08-31  293  	unsigned long iova_pfn;
8c773d53fb7b64 Xie Yongji 2021-08-31  294  
8c773d53fb7b64 Xie Yongji 2021-08-31  295  	/*
8c773d53fb7b64 Xie Yongji 2021-08-31  296  	 * Freeing non-power-of-two-sized allocations back into the IOVA caches
8c773d53fb7b64 Xie Yongji 2021-08-31  297  	 * will come back to bite us badly, so we have to waste a bit of space
8c773d53fb7b64 Xie Yongji 2021-08-31  298  	 * rounding up anything cacheable to make sure that can't happen. The
8c773d53fb7b64 Xie Yongji 2021-08-31  299  	 * order of the unadjusted size will still match upon freeing.
8c773d53fb7b64 Xie Yongji 2021-08-31  300  	 */
8c773d53fb7b64 Xie Yongji 2021-08-31  301  	if (iova_len < (1 << (IOVA_RANGE_CACHE_MAX_SIZE - 1)))
8c773d53fb7b64 Xie Yongji 2021-08-31  302  		iova_len = roundup_pow_of_two(iova_len);
8c773d53fb7b64 Xie Yongji 2021-08-31  303  	iova_pfn = alloc_iova_fast(iovad, iova_len, limit >> shift, true);
8c773d53fb7b64 Xie Yongji 2021-08-31  304  
8c773d53fb7b64 Xie Yongji 2021-08-31 @305  	return iova_pfn << shift;

I feel like iova_pfn should probably be declared as dma_addr_t?

8c773d53fb7b64 Xie Yongji 2021-08-31  306  }

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