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Date: Tue, 29 Dec 2020 14:48:08 +0530
From: Pratyush Yadav <p.yadav@...com>
To: kernel test robot <lkp@...el.com>
CC: Mark Brown <broonie@...nel.org>,
Vignesh Raghavendra <vigneshr@...com>,
<kbuild-all@...ts.01.org>, <clang-built-linux@...glegroups.com>,
<linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/7] spi: cadence-quadspi: Wait at least 500 ms for
direct reads
On 29/12/20 11:29AM, kernel test robot wrote:
> Hi Pratyush,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on spi/for-next]
> [also build test WARNING on v5.11-rc1 next-20201223]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
>
> url: https://github.com/0day-ci/linux/commits/Pratyush-Yadav/spi-cadence-quadspi-Add-Octal-DTR-support/20201223-025328
> base: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
> config: arm-randconfig-r006-20201221 (attached as .config)
> compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cee1e7d14f4628d6174b33640d502bff3b54ae45)
> reproduce (this is a W=1 build):
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # install arm cross compiling tool for clang build
> # apt-get install binutils-arm-linux-gnueabi
> # https://github.com/0day-ci/linux/commit/04a7bcbc449363e5d6f498376c69116567b49d7d
> git remote add linux-review https://github.com/0day-ci/linux
> git fetch --no-tags linux-review Pratyush-Yadav/spi-cadence-quadspi-Add-Octal-DTR-support/20201223-025328
> git checkout 04a7bcbc449363e5d6f498376c69116567b49d7d
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/spi/spi-cadence-quadspi.c:966:24: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (500UL) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
> msecs_to_jiffies(max(len, 500UL)))) {
> ^~~~~~~~~~~~~~~
> include/linux/minmax.h:58:19: note: expanded from macro 'max'
> #define max(x, y) __careful_cmp(x, y, >)
> ^~~~~~~~~~~~~~~~~~~~~~
> include/linux/minmax.h:42:24: note: expanded from macro '__careful_cmp'
> __builtin_choose_expr(__safe_cmp(x, y), \
> ^~~~~~~~~~~~~~~~
> include/linux/minmax.h:32:4: note: expanded from macro '__safe_cmp'
> (__typecheck(x, y) && __no_side_effects(x, y))
> ^~~~~~~~~~~~~~~~~
> include/linux/minmax.h:18:28: note: expanded from macro '__typecheck'
> (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
> ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~
> 1 warning generated.
On arm64 size_t is defined as unsigned long and on arm is it defined as
unsigned int. So using 500U would generate the same warning on 64-bit
platforms. Maybe the fix is to do something like: max(len, (size_t)500).
Any better ideas?
>
>
> vim +966 drivers/spi/spi-cadence-quadspi.c
>
> 919
> 920 static int cqspi_direct_read_execute(struct cqspi_flash_pdata *f_pdata,
> 921 u_char *buf, loff_t from, size_t len)
> 922 {
> 923 struct cqspi_st *cqspi = f_pdata->cqspi;
> 924 struct device *dev = &cqspi->pdev->dev;
> 925 enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
> 926 dma_addr_t dma_src = (dma_addr_t)cqspi->mmap_phys_base + from;
> 927 int ret = 0;
> 928 struct dma_async_tx_descriptor *tx;
> 929 dma_cookie_t cookie;
> 930 dma_addr_t dma_dst;
> 931 struct device *ddev;
> 932
> 933 if (!cqspi->rx_chan || !virt_addr_valid(buf)) {
> 934 memcpy_fromio(buf, cqspi->ahb_base + from, len);
> 935 return 0;
> 936 }
> 937
> 938 ddev = cqspi->rx_chan->device->dev;
> 939 dma_dst = dma_map_single(ddev, buf, len, DMA_FROM_DEVICE);
> 940 if (dma_mapping_error(ddev, dma_dst)) {
> 941 dev_err(dev, "dma mapping failed\n");
> 942 return -ENOMEM;
> 943 }
> 944 tx = dmaengine_prep_dma_memcpy(cqspi->rx_chan, dma_dst, dma_src,
> 945 len, flags);
> 946 if (!tx) {
> 947 dev_err(dev, "device_prep_dma_memcpy error\n");
> 948 ret = -EIO;
> 949 goto err_unmap;
> 950 }
> 951
> 952 tx->callback = cqspi_rx_dma_callback;
> 953 tx->callback_param = cqspi;
> 954 cookie = tx->tx_submit(tx);
> 955 reinit_completion(&cqspi->rx_dma_complete);
> 956
> 957 ret = dma_submit_error(cookie);
> 958 if (ret) {
> 959 dev_err(dev, "dma_submit_error %d\n", cookie);
> 960 ret = -EIO;
> 961 goto err_unmap;
> 962 }
> 963
> 964 dma_async_issue_pending(cqspi->rx_chan);
> 965 if (!wait_for_completion_timeout(&cqspi->rx_dma_complete,
> > 966 msecs_to_jiffies(max(len, 500UL)))) {
> 967 dmaengine_terminate_sync(cqspi->rx_chan);
> 968 dev_err(dev, "DMA wait_for_completion_timeout\n");
> 969 ret = -ETIMEDOUT;
> 970 goto err_unmap;
> 971 }
> 972
> 973 err_unmap:
> 974 dma_unmap_single(ddev, dma_dst, len, DMA_FROM_DEVICE);
> 975
> 976 return ret;
> 977 }
> 978
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
--
Regards,
Pratyush Yadav
Texas Instruments India
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