linux-kernel - Re: [LINUX PATCH v12 3/3] mtd: rawnand: arasan: Add support for Arasan NAND Flash Controller

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Message-ID: <201811100712.fDf3TZu9%fengguang.wu@intel.com>
Date:   Sat, 10 Nov 2018 07:03:49 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
Cc:     kbuild-all@...org, boris.brezillon@...tlin.com,
        miquel.raynal@...tlin.com, richard@....at, dwmw2@...radead.org,
        computersforpeace@...il.com, marek.vasut@...il.com,
        michals@...inx.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, nagasuresh12@...il.com,
        robh@...nel.org,
        Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
Subject: Re: [LINUX PATCH v12 3/3] mtd: rawnand: arasan: Add support for
 Arasan NAND Flash Controller

Hi Naga,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on mtd/nand/next]
[also build test WARNING on v4.20-rc1 next-20181109]
[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/Naga-Sureshkumar-Relli/dt-bindings-mtd-arasan-Add-device-tree-binding-documentation/20181110-034106
base:   git://git.infradead.org/linux-mtd.git nand/next
config: sh-allyesconfig (attached as .config)
compiler: sh4-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=sh 

All warnings (new ones prefixed by >>):

   In file included from include/linux/scatterlist.h:9:0,
                    from include/linux/dma-mapping.h:11,
                    from drivers/mtd//nand/raw/arasan_nand.c:12:
   drivers/mtd//nand/raw/arasan_nand.c: In function 'anfc_rw_dma_op':
>> drivers/mtd//nand/raw/arasan_nand.c:353:16: warning: right shift count >= width of type [-Wshift-count-overflow]
     writel((paddr >> 32), nfc->base + DMA_ADDR1_OFST);
                   ^
   arch/sh/include/asm/io.h:31:77: note: in definition of macro '__raw_writel'
    #define __raw_writel(v,a) (__chk_io_ptr(a), *(volatile u32 __force *)(a) = (v))
                                                                                ^
   arch/sh/include/asm/io.h:46:62: note: in expansion of macro 'ioswabl'
    #define writel_relaxed(v,c) ((void)__raw_writel((__force u32)ioswabl(v),c))
                                                                 ^~~~~~~
   arch/sh/include/asm/io.h:56:32: note: in expansion of macro 'writel_relaxed'
    #define writel(v,a)  ({ wmb(); writel_relaxed((v),(a)); })
                                   ^~~~~~~~~~~~~~
>> drivers/mtd//nand/raw/arasan_nand.c:353:2: note: in expansion of macro 'writel'
     writel((paddr >> 32), nfc->base + DMA_ADDR1_OFST);
     ^~~~~~

vim +353 drivers/mtd//nand/raw/arasan_nand.c

   325	
   326	static void anfc_rw_dma_op(struct mtd_info *mtd, u8 *buf, int len,
   327				   bool do_read, u32 prog, int pktcount, int pktsize)
   328	{
   329		dma_addr_t paddr;
   330		struct nand_chip *chip = mtd_to_nand(mtd);
   331		struct anfc_nand_controller *nfc = to_anfc(chip->controller);
   332		struct anfc_nand_chip *achip = to_anfc_nand(chip);
   333		u32 eccintr = 0, dir;
   334	
   335		if (pktsize == 0)
   336			pktsize = len;
   337	
   338		anfc_setpktszcnt(nfc, pktsize, pktcount);
   339	
   340		if (!achip->strength)
   341			eccintr = MBIT_ERROR;
   342	
   343		if (do_read)
   344			dir = DMA_FROM_DEVICE;
   345		else
   346			dir = DMA_TO_DEVICE;
   347		paddr = dma_map_single(nfc->dev, buf, len, dir);
   348		if (dma_mapping_error(nfc->dev, paddr)) {
   349			dev_err(nfc->dev, "Read buffer mapping error");
   350			return;
   351		}
   352		writel(paddr, nfc->base + DMA_ADDR0_OFST);
 > 353		writel((paddr >> 32), nfc->base + DMA_ADDR1_OFST);
   354		anfc_enable_intrs(nfc, (XFER_COMPLETE | eccintr));
   355		writel(prog, nfc->base + PROG_OFST);
   356		anfc_wait_for_event(nfc);
   357		dma_unmap_single(nfc->dev, paddr, len, dir);
   358	}
   359	

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