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SubjectRe: [PATCH 3/3] mtd: onenand: Enable compile testing of OMAP and Samsung drivers
Hi Krzysztof,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.5-rc4 next-20191220]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url: https://github.com/0day-ci/linux/commits/Krzysztof-Kozlowski/mtd-onenand-samsung-Fix-pointer-cast-Wpointer-to-int-cast-warnings-on-64-bit/20191230-030838
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git bf8d1cd4386535004c4afe7f03d37f9864c9940e
reproduce:
# apt-get install sparse
# sparse version: v0.6.1-129-g341daf20-dirty
make ARCH=x86_64 allmodconfig
make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)

>> drivers/mtd/nand/onenand/samsung_mtd.c:678:17: sparse: sparse: incorrect type in argument 2 (different address spaces)
>> drivers/mtd/nand/onenand/samsung_mtd.c:678:17: sparse: expected void const *from
>> drivers/mtd/nand/onenand/samsung_mtd.c:678:17: sparse: got void [noderef] <asn:2> *[assigned] p
>> drivers/mtd/nand/onenand/samsung_mtd.c:679:19: sparse: sparse: incorrect type in assignment (different address spaces)
>> drivers/mtd/nand/onenand/samsung_mtd.c:679:19: sparse: expected void [noderef] <asn:2> *[assigned] p
>> drivers/mtd/nand/onenand/samsung_mtd.c:679:19: sparse: got unsigned char *
drivers/mtd/nand/onenand/samsung_mtd.c:682:9: sparse: sparse: incorrect type in argument 2 (different address spaces)
drivers/mtd/nand/onenand/samsung_mtd.c:682:9: sparse: expected void const *from
drivers/mtd/nand/onenand/samsung_mtd.c:682:9: sparse: got void [noderef] <asn:2> *[assigned] p

vim +678 drivers/mtd/nand/onenand/samsung_mtd.c

e23abf4b774322 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 614
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 615 static int s5pc110_read_bufferram(struct mtd_info *mtd, int area,
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 616 unsigned char *buffer, int offset, size_t count)
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 617 {
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 618 struct onenand_chip *this = mtd->priv;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 619 void __iomem *p;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 620 void *buf = (void *) buffer;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 621 dma_addr_t dma_src, dma_dst;
08b3af3092bb2c drivers/mtd/onenand/samsung.c Kyungmin Park 2010-11-02 622 int err, ofs, page_dma = 0;
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 623 struct device *dev = &onenand->pdev->dev;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 624
9aba97ad004ed0 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-08-27 625 p = this->base + area;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 626 if (ONENAND_CURRENT_BUFFERRAM(this)) {
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 627 if (area == ONENAND_DATARAM)
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 628 p += this->writesize;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 629 else
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 630 p += mtd->oobsize;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 631 }
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 632
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 633 if (offset & 3 || (size_t) buf & 3 ||
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 634 !onenand->dma_addr || count != mtd->writesize)
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 635 goto normal;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 636
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 637 /* Handle vmalloc address */
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 638 if (buf >= high_memory) {
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 639 struct page *page;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 640
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 641 if (((size_t) buf & PAGE_MASK) !=
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 642 ((size_t) (buf + count - 1) & PAGE_MASK))
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 643 goto normal;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 644 page = vmalloc_to_page(buf);
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 645 if (!page)
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 646 goto normal;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 647
08b3af3092bb2c drivers/mtd/onenand/samsung.c Kyungmin Park 2010-11-02 648 /* Page offset */
08b3af3092bb2c drivers/mtd/onenand/samsung.c Kyungmin Park 2010-11-02 649 ofs = ((size_t) buf & ~PAGE_MASK);
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 650 page_dma = 1;
08b3af3092bb2c drivers/mtd/onenand/samsung.c Kyungmin Park 2010-11-02 651
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 652 /* DMA routine */
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 653 dma_src = onenand->phys_base + (p - this->base);
08b3af3092bb2c drivers/mtd/onenand/samsung.c Kyungmin Park 2010-11-02 654 dma_dst = dma_map_page(dev, page, ofs, count, DMA_FROM_DEVICE);
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 655 } else {
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 656 /* DMA routine */
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 657 dma_src = onenand->phys_base + (p - this->base);
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 658 dma_dst = dma_map_single(dev, buf, count, DMA_FROM_DEVICE);
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 659 }
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 660 if (dma_mapping_error(dev, dma_dst)) {
102f66a740cfbe drivers/mtd/nand/onenand/samsung_mtd.c Krzysztof Kozlowski 2019-12-29 661 dev_err(dev, "Couldn't map a %zu byte buffer for DMA\n", count);
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 662 goto normal;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 663 }
81d46c59550997 drivers/mtd/onenand/samsung.c Arnd Bergmann 2014-05-08 664 err = s5pc110_dma_ops(dma_dst, dma_src,
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 665 count, S5PC110_DMA_DIR_READ);
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 666
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 667 if (page_dma)
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 668 dma_unmap_page(dev, dma_dst, count, DMA_FROM_DEVICE);
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 669 else
dcf08227e964a5 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-09-28 670 dma_unmap_single(dev, dma_dst, count, DMA_FROM_DEVICE);
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 671
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 672 if (!err)
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 673 return 0;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 674
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 675 normal:
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 676 if (count != mtd->writesize) {
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 677 /* Copy the bufferram to memory to prevent unaligned access */
9aba97ad004ed0 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-08-27 @678 memcpy(this->page_buf, p, mtd->writesize);
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 @679 p = this->page_buf + offset;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 680 }
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 681
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 682 memcpy(buffer, p, count);
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 683
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 684 return 0;
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 685 }
46f3e88bd9da01 drivers/mtd/onenand/samsung.c Kyungmin Park 2010-04-28 686

:::::: The code at line 678 was first introduced by commit
:::::: 9aba97ad004ed0cde9747a9daf5b1484edb746cd mtd: OneNAND: Fix 2KiB pagesize handling at Samsung SoCs

:::::: TO: Kyungmin Park <kyungmin.park@samsung.com>
:::::: CC: David Woodhouse <David.Woodhouse@intel.com>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation

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