linux-kernel - Re: [v6] serial: 8250_dw: Add support for big-endian MMIO accesses

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Date:	Tue, 6 Oct 2015 16:01:52 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Noam Camus <noamc@...hip.com>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, gregkh@...uxfoundation.org,
	jslaby@...e.com, peter@...leysoftware.com, fransklaver@...il.com,
	Alexey.Brodkin@...opsys.com, vgupta@...opsys.com,
	Noam Camus <noamc@...hip.com>
Subject: Re: [v6] serial: 8250_dw: Add support for big-endian MMIO accesses

Hi Noam,

[auto build test WARNING on v4.3-rc4 -- if it's inappropriate base, please ignore]

reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/tty/serial/8250/8250_dw.c:214:27: sparse: incorrect type in argument 1 (different modifiers)
   drivers/tty/serial/8250/8250_dw.c:214:27:    expected void [noderef] <asn:2>*<noident>
   drivers/tty/serial/8250/8250_dw.c:214:27:    got void const [noderef] <asn:2>*addr
   drivers/tty/serial/8250/8250_dw.c: In function '_dw8250_serial_in32be':
   drivers/tty/serial/8250/8250_dw.c:214:20: warning: passing argument 1 of 'ioread32be' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     return ioread32be(addr);
                       ^
   In file included from arch/x86/include/asm/io.h:203:0,
                    from arch/x86/include/asm/realmode.h:5,
                    from arch/x86/include/asm/acpi.h:33,
                    from arch/x86/include/asm/fixmap.h:19,
                    from arch/x86/include/asm/apic.h:12,
                    from arch/x86/include/asm/smp.h:12,
                    from arch/x86/include/asm/mmzone_64.h:10,
                    from arch/x86/include/asm/mmzone.h:4,
                    from include/linux/mmzone.h:934,
                    from include/linux/gfp.h:5,
                    from include/linux/device.h:29,
                    from drivers/tty/serial/8250/8250_dw.c:16:
   include/asm-generic/iomap.h:32:21: note: expected 'void *' but argument is of type 'const void *'
    extern unsigned int ioread32be(void __iomem *);
                        ^

vim +214 drivers/tty/serial/8250/8250_dw.c

   198	}
   199	
   200	static unsigned int dw8250_serial_in32(struct uart_port *p, int offset)
   201	{
   202		unsigned int value = readl(p->membase + (offset << p->regshift));
   203	
   204		return dw8250_modify_msr(p, offset, value);
   205	}
   206	
   207	static void _dw8250_serial_out32be(unsigned int value, void __iomem *addr)
   208	{
   209		iowrite32be(value, addr);
   210	}
   211	
   212	static unsigned int _dw8250_serial_in32be(const void __iomem *addr)
   213	{
 > 214		return ioread32be(addr);
   215	}
   216	
   217	static void dw8250_serial_out32be(struct uart_port *p, int offset, int value)
   218	{
   219		iowrite32be(value, p->membase + (offset << p->regshift));
   220		dw8250_check_LCR(p, offset, value);
   221	}
   222	

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