[xhci:for-usb-next 19/27] drivers/usb/host/xhci-dbgcap.c:410:1: warning: no previous prototype for function 'xhci_dbc_ring_alloc'

[xhci:for-usb-next 19/27] drivers/usb/host/xhci-dbgcap.c:410:1: warning: no previous prototype for function 'xhci_dbc_ring_alloc'

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git for-usb-next
head:   044dea1e1b49139f65a0fd11637daebb233123ef
commit: 461a5545eec20e9cc933b900f5efe7f4bce655ae [19/27] xhci: dbc: don't use generic xhci ring allocation functions for dbc.
config: x86_64-allyesconfig (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project e0ee2288424952e0445f096ae7800472eac11249)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        git checkout 461a5545eec20e9cc933b900f5efe7f4bce655ae
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> drivers/usb/host/xhci-dbgcap.c:410:1: warning: no previous prototype for function 'xhci_dbc_ring_alloc' [-Wmissing-prototypes]
   xhci_dbc_ring_alloc(struct device *dev, enum xhci_ring_type type, gfp_t flags)
   ^
   drivers/usb/host/xhci-dbgcap.c:409:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   struct xhci_ring *
   ^
   static 
   drivers/usb/host/xhci-dbgcap.c:530:18: warning: unused variable 'dev' [-Wunused-variable]
           struct device           *dev = xhci_to_hcd(xhci)->self.controller;
                                    ^
   2 warnings generated.

vim +/xhci_dbc_ring_alloc +410 drivers/usb/host/xhci-dbgcap.c

   408	
   409	struct xhci_ring *
 > 410	xhci_dbc_ring_alloc(struct device *dev, enum xhci_ring_type type, gfp_t flags)
   411	{
   412		struct xhci_ring *ring;
   413		struct xhci_segment *seg;
   414		dma_addr_t dma;
   415	
   416		ring = kzalloc(sizeof(*ring), flags);
   417		if (!ring)
   418			return NULL;
   419	
   420		ring->num_segs = 1;
   421		ring->type = type;
   422	
   423		seg = kzalloc(sizeof(*seg), flags);
   424		if (!seg)
   425			goto seg_fail;
   426	
   427		ring->first_seg = seg;
   428		ring->last_seg = seg;
   429		seg->next = seg;
   430	
   431		seg->trbs = dma_alloc_coherent(dev, TRB_SEGMENT_SIZE, &dma, flags);
   432		if (!seg->trbs)
   433			goto dma_fail;
   434	
   435		seg->dma = dma;
   436	
   437		/* Only event ring does not use link TRB */
   438		if (type != TYPE_EVENT) {
   439			union xhci_trb *trb = &seg->trbs[TRBS_PER_SEGMENT - 1];
   440	
   441			trb->link.segment_ptr = cpu_to_le64(dma);
   442			trb->link.control = cpu_to_le32(LINK_TOGGLE | TRB_TYPE(TRB_LINK));
   443		}
   444		INIT_LIST_HEAD(&ring->td_list);
   445		xhci_initialize_ring_info(ring, 1);
   446		return ring;
   447	dma_fail:
   448		kfree(seg);
   449	seg_fail:
   450		kfree(ring);
   451		return NULL;
   452	}
   453	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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