Re: [PATCH V3 2/5] mailbox: Add support for QTI CPUCP mailbox controller

[kernel test robot <lkp@intel.com>]

Hi Sibi,

kernel test robot noticed the following build errors:

[auto build test ERROR on robh/for-next]
[also build test ERROR on linus/master v6.9-rc4 next-20240419]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Sibi-Sankar/dt-bindings-mailbox-qcom-Add-CPUCP-mailbox-controller-bindings/20240417-213339
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20240417132856.1106250-3-quic_sibis%40quicinc.com
patch subject: [PATCH V3 2/5] mailbox: Add support for QTI CPUCP mailbox controller
config: hexagon-randconfig-r121-20240421 (https://download.01.org/0day-ci/archive/20240421/202404211602.d8vcGEH0-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project.git 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce: (https://download.01.org/0day-ci/archive/20240421/202404211602.d8vcGEH0-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404211602.d8vcGEH0-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/mailbox/qcom-cpucp-mbox.c:6:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/mailbox/qcom-cpucp-mbox.c:6:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/mailbox/qcom-cpucp-mbox.c:6:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
>> drivers/mailbox/qcom-cpucp-mbox.c:61:11: error: call to undeclared function 'readq'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
           status = readq(cpucp->rx_base + APSS_CPUCP_RX_MBOX_STAT);
                    ^
>> drivers/mailbox/qcom-cpucp-mbox.c:71:4: error: call to undeclared function 'writeq'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
                           writeq(BIT(i), cpucp->rx_base + APSS_CPUCP_RX_MBOX_CLEAR);
                           ^
   drivers/mailbox/qcom-cpucp-mbox.c:85:8: error: call to undeclared function 'readq'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
           val = readq(cpucp->rx_base + APSS_CPUCP_RX_MBOX_EN);
                 ^
   drivers/mailbox/qcom-cpucp-mbox.c:87:2: error: call to undeclared function 'writeq'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
           writeq(val, cpucp->rx_base + APSS_CPUCP_RX_MBOX_EN);
           ^
   drivers/mailbox/qcom-cpucp-mbox.c:98:8: error: call to undeclared function 'readq'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
           val = readq(cpucp->rx_base + APSS_CPUCP_RX_MBOX_EN);
                 ^
   drivers/mailbox/qcom-cpucp-mbox.c:100:2: error: call to undeclared function 'writeq'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
           writeq(val, cpucp->rx_base + APSS_CPUCP_RX_MBOX_EN);
           ^
   drivers/mailbox/qcom-cpucp-mbox.c:140:2: error: call to undeclared function 'writeq'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
           writeq(0, cpucp->rx_base + APSS_CPUCP_RX_MBOX_EN);
           ^
   6 warnings and 7 errors generated.


vim +/readq +61 drivers/mailbox/qcom-cpucp-mbox.c

    51	
    52	static irqreturn_t qcom_cpucp_mbox_irq_fn(int irq, void *data)
    53	{
    54		struct qcom_cpucp_mbox *cpucp = data;
    55		struct mbox_chan *chan;
    56		unsigned long flags;
    57		u64 status;
    58		u32 val;
    59		int i;
    60	
  > 61		status = readq(cpucp->rx_base + APSS_CPUCP_RX_MBOX_STAT);
    62	
    63		for (i = 0; i < APSS_CPUCP_IPC_CHAN_SUPPORTED; i++) {
    64			val = 0;
    65			if (status & BIT(i)) {
    66				val = readl(cpucp->rx_base + APSS_CPUCP_RX_MBOX_CMD(i) + APSS_CPUCP_MBOX_CMD_OFF);
    67				chan = &cpucp->chans[i];
    68				spin_lock_irqsave(&chan->lock, flags);
    69				if (chan->cl)
    70					mbox_chan_received_data(chan, &val);
  > 71				writeq(BIT(i), cpucp->rx_base + APSS_CPUCP_RX_MBOX_CLEAR);
    72				spin_unlock_irqrestore(&chan->lock, flags);
    73			}
    74		}
    75	
    76		return IRQ_HANDLED;
    77	}
    78	

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