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SubjectRe: [PATCH 12/15] dmaengine: pxa: make the filter function internal
Hi Robert,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v4.16]
[cannot apply to arm-soc/for-next next-20180329]
[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/Robert-Jarzmik/ARM-pxa-switch-to-DMA-slave-maps/20180402-233029
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

drivers/mtd/nand/marvell_nand.c:2621:17: sparse: undefined identifier 'pxad_filter_fn'
>> drivers/mtd/nand/marvell_nand.c:2621:17: sparse: call with no type!
In file included from drivers/mtd/nand/marvell_nand.c:21:0:
drivers/mtd/nand/marvell_nand.c: In function 'marvell_nfc_init_dma':
drivers/mtd/nand/marvell_nand.c:2621:42: error: 'pxad_filter_fn' undeclared (first use in this function); did you mean 'dma_filter_fn'?
dma_request_slave_channel_compat(mask, pxad_filter_fn,
^
include/linux/dmaengine.h:1408:46: note: in definition of macro 'dma_request_slave_channel_compat'
__dma_request_slave_channel_compat(&(mask), x, y, dev, name)
^
drivers/mtd/nand/marvell_nand.c:2621:42: note: each undeclared identifier is reported only once for each function it appears in
dma_request_slave_channel_compat(mask, pxad_filter_fn,
^
include/linux/dmaengine.h:1408:46: note: in definition of macro 'dma_request_slave_channel_compat'
__dma_request_slave_channel_compat(&(mask), x, y, dev, name)
^

vim +2621 drivers/mtd/nand/marvell_nand.c

02f26ecf Miquel Raynal 2018-01-09 2588
02f26ecf Miquel Raynal 2018-01-09 2589 static int marvell_nfc_init_dma(struct marvell_nfc *nfc)
02f26ecf Miquel Raynal 2018-01-09 2590 {
02f26ecf Miquel Raynal 2018-01-09 2591 struct platform_device *pdev = container_of(nfc->dev,
02f26ecf Miquel Raynal 2018-01-09 2592 struct platform_device,
02f26ecf Miquel Raynal 2018-01-09 2593 dev);
02f26ecf Miquel Raynal 2018-01-09 2594 struct dma_slave_config config = {};
02f26ecf Miquel Raynal 2018-01-09 2595 struct resource *r;
02f26ecf Miquel Raynal 2018-01-09 2596 dma_cap_mask_t mask;
02f26ecf Miquel Raynal 2018-01-09 2597 struct pxad_param param;
02f26ecf Miquel Raynal 2018-01-09 2598 int ret;
02f26ecf Miquel Raynal 2018-01-09 2599
02f26ecf Miquel Raynal 2018-01-09 2600 if (!IS_ENABLED(CONFIG_PXA_DMA)) {
02f26ecf Miquel Raynal 2018-01-09 2601 dev_warn(nfc->dev,
02f26ecf Miquel Raynal 2018-01-09 2602 "DMA not enabled in configuration\n");
02f26ecf Miquel Raynal 2018-01-09 2603 return -ENOTSUPP;
02f26ecf Miquel Raynal 2018-01-09 2604 }
02f26ecf Miquel Raynal 2018-01-09 2605
02f26ecf Miquel Raynal 2018-01-09 2606 ret = dma_set_mask_and_coherent(nfc->dev, DMA_BIT_MASK(32));
02f26ecf Miquel Raynal 2018-01-09 2607 if (ret)
02f26ecf Miquel Raynal 2018-01-09 2608 return ret;
02f26ecf Miquel Raynal 2018-01-09 2609
02f26ecf Miquel Raynal 2018-01-09 2610 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
02f26ecf Miquel Raynal 2018-01-09 2611 if (!r) {
02f26ecf Miquel Raynal 2018-01-09 2612 dev_err(nfc->dev, "No resource defined for data DMA\n");
02f26ecf Miquel Raynal 2018-01-09 2613 return -ENXIO;
02f26ecf Miquel Raynal 2018-01-09 2614 }
02f26ecf Miquel Raynal 2018-01-09 2615
02f26ecf Miquel Raynal 2018-01-09 2616 param.drcmr = r->start;
02f26ecf Miquel Raynal 2018-01-09 2617 param.prio = PXAD_PRIO_LOWEST;
02f26ecf Miquel Raynal 2018-01-09 2618 dma_cap_zero(mask);
02f26ecf Miquel Raynal 2018-01-09 2619 dma_cap_set(DMA_SLAVE, mask);
02f26ecf Miquel Raynal 2018-01-09 2620 nfc->dma_chan =
02f26ecf Miquel Raynal 2018-01-09 @2621 dma_request_slave_channel_compat(mask, pxad_filter_fn,
02f26ecf Miquel Raynal 2018-01-09 2622 &param, nfc->dev,
02f26ecf Miquel Raynal 2018-01-09 2623 "data");
02f26ecf Miquel Raynal 2018-01-09 2624 if (!nfc->dma_chan) {
02f26ecf Miquel Raynal 2018-01-09 2625 dev_err(nfc->dev,
02f26ecf Miquel Raynal 2018-01-09 2626 "Unable to request data DMA channel\n");
02f26ecf Miquel Raynal 2018-01-09 2627 return -ENODEV;
02f26ecf Miquel Raynal 2018-01-09 2628 }
02f26ecf Miquel Raynal 2018-01-09 2629
02f26ecf Miquel Raynal 2018-01-09 2630 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
02f26ecf Miquel Raynal 2018-01-09 2631 if (!r)
02f26ecf Miquel Raynal 2018-01-09 2632 return -ENXIO;
02f26ecf Miquel Raynal 2018-01-09 2633
02f26ecf Miquel Raynal 2018-01-09 2634 config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
02f26ecf Miquel Raynal 2018-01-09 2635 config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
02f26ecf Miquel Raynal 2018-01-09 2636 config.src_addr = r->start + NDDB;
02f26ecf Miquel Raynal 2018-01-09 2637 config.dst_addr = r->start + NDDB;
02f26ecf Miquel Raynal 2018-01-09 2638 config.src_maxburst = 32;
02f26ecf Miquel Raynal 2018-01-09 2639 config.dst_maxburst = 32;
02f26ecf Miquel Raynal 2018-01-09 2640 ret = dmaengine_slave_config(nfc->dma_chan, &config);
02f26ecf Miquel Raynal 2018-01-09 2641 if (ret < 0) {
02f26ecf Miquel Raynal 2018-01-09 2642 dev_err(nfc->dev, "Failed to configure DMA channel\n");
02f26ecf Miquel Raynal 2018-01-09 2643 return ret;
02f26ecf Miquel Raynal 2018-01-09 2644 }
02f26ecf Miquel Raynal 2018-01-09 2645
02f26ecf Miquel Raynal 2018-01-09 2646 /*
02f26ecf Miquel Raynal 2018-01-09 2647 * DMA must act on length multiple of 32 and this length may be
02f26ecf Miquel Raynal 2018-01-09 2648 * bigger than the destination buffer. Use this buffer instead
02f26ecf Miquel Raynal 2018-01-09 2649 * for DMA transfers and then copy the desired amount of data to
02f26ecf Miquel Raynal 2018-01-09 2650 * the provided buffer.
02f26ecf Miquel Raynal 2018-01-09 2651 */
c495a927 Miquel Raynal 2018-01-19 2652 nfc->dma_buf = kmalloc(MAX_CHUNK_SIZE, GFP_KERNEL | GFP_DMA);
02f26ecf Miquel Raynal 2018-01-09 2653 if (!nfc->dma_buf)
02f26ecf Miquel Raynal 2018-01-09 2654 return -ENOMEM;
02f26ecf Miquel Raynal 2018-01-09 2655
02f26ecf Miquel Raynal 2018-01-09 2656 nfc->use_dma = true;
02f26ecf Miquel Raynal 2018-01-09 2657
02f26ecf Miquel Raynal 2018-01-09 2658 return 0;
02f26ecf Miquel Raynal 2018-01-09 2659 }
02f26ecf Miquel Raynal 2018-01-09 2660

:::::: The code at line 2621 was first introduced by commit
:::::: 02f26ecf8c772751d4b24744d487f6b1b20e75d4 mtd: nand: add reworked Marvell NAND controller driver

:::::: TO: Miquel Raynal <miquel.raynal@free-electrons.com>
:::::: CC: Boris Brezillon <boris.brezillon@free-electrons.com>

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

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