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asm-generic/io.h: Fix sparse warnings on big-endian architectures 

On big-endian architectures like OpenRISC, sparse outputs below warnings on
asm-generic/io.h.  This is due to io statements like:

  __raw_writel(cpu_to_le32(value), PCI_IOBASE + addr);

The __raw_writel() function expects native endianness, however
cpu_to_le32() returns __le32.  On little-endian machines these match up
and there is no issue.  However, on big-endian we get warnings, for IO
that is defined as little-endian the mismatch is expected.

The fix I propose is to __force to native endian.

Warnings:

./include/asm-generic/io.h:166:15: warning: cast to restricted __le16
./include/asm-generic/io.h:166:15: warning: cast to restricted __le16
./include/asm-generic/io.h:166:15: warning: cast to restricted __le16
./include/asm-generic/io.h:166:15: warning: cast to restricted __le16
./include/asm-generic/io.h:179:15: warning: cast to restricted __le32
./include/asm-generic/io.h:179:15: warning: cast to restricted __le32
./include/asm-generic/io.h:179:15: warning: cast to restricted __le32
./include/asm-generic/io.h:179:15: warning: cast to restricted __le32
./include/asm-generic/io.h:179:15: warning: cast to restricted __le32
./include/asm-generic/io.h:179:15: warning: cast to restricted __le32
./include/asm-generic/io.h:215:22: warning: incorrect type in argument 1 (different base types)
./include/asm-generic/io.h:215:22:    expected unsigned short [usertype] value
./include/asm-generic/io.h:215:22:    got restricted __le16 [usertype]
./include/asm-generic/io.h:225:22: warning: incorrect type in argument 1 (different base types)
./include/asm-generic/io.h:225:22:    expected unsigned int [usertype] value
./include/asm-generic/io.h:225:22:    got restricted __le32 [usertype]

Signed-off-by: Stafford Horne <shorne@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Stafford Horne 2020-07-29 21:03:14 +09:00
Родитель c28b27416d
Коммит c1d55d5013
1 изменённых файлов: 8 добавлений и 8 удалений
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16
include/asm-generic/io.h
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@ -163,7 +163,7 @@ static inline u16 readw(const volatile void __iomem *addr)
u16 val; u16 val;
__io_br(); __io_br();
val = __le16_to_cpu(__raw_readw(addr)); val = __le16_to_cpu((__le16 __force)__raw_readw(addr));
__io_ar(val); __io_ar(val);
return val; return val;
} }
@ -176,7 +176,7 @@ static inline u32 readl(const volatile void __iomem *addr)
u32 val; u32 val;
__io_br(); __io_br();
val = __le32_to_cpu(__raw_readl(addr)); val = __le32_to_cpu((__le32 __force)__raw_readl(addr));
__io_ar(val); __io_ar(val);
return val; return val;
} }
@ -212,7 +212,7 @@ static inline void writeb(u8 value, volatile void __iomem *addr)
static inline void writew(u16 value, volatile void __iomem *addr) static inline void writew(u16 value, volatile void __iomem *addr)
{ {
__io_bw(); __io_bw();
__raw_writew(cpu_to_le16(value), addr); __raw_writew((u16 __force)cpu_to_le16(value), addr);
__io_aw(); __io_aw();
} }
#endif #endif
@ -222,7 +222,7 @@ static inline void writew(u16 value, volatile void __iomem *addr)
static inline void writel(u32 value, volatile void __iomem *addr) static inline void writel(u32 value, volatile void __iomem *addr)
{ {
__io_bw(); __io_bw();
__raw_writel(__cpu_to_le32(value), addr); __raw_writel((u32 __force)__cpu_to_le32(value), addr);
__io_aw(); __io_aw();
} }
#endif #endif
@ -474,7 +474,7 @@ static inline u16 _inw(unsigned long addr)
u16 val; u16 val;
__io_pbr(); __io_pbr();
val = __le16_to_cpu(__raw_readw(PCI_IOBASE + addr)); val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
__io_par(val); __io_par(val);
return val; return val;
} }
@ -487,7 +487,7 @@ static inline u32 _inl(unsigned long addr)
u32 val; u32 val;
__io_pbr(); __io_pbr();
val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr)); val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
__io_par(val); __io_par(val);
return val; return val;
} }
@ -508,7 +508,7 @@ static inline void _outb(u8 value, unsigned long addr)
static inline void _outw(u16 value, unsigned long addr) static inline void _outw(u16 value, unsigned long addr)
{ {
__io_pbw(); __io_pbw();
__raw_writew(cpu_to_le16(value), PCI_IOBASE + addr); __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
__io_paw(); __io_paw();
} }
#endif #endif
@ -518,7 +518,7 @@ static inline void _outw(u16 value, unsigned long addr)
static inline void _outl(u32 value, unsigned long addr) static inline void _outl(u32 value, unsigned long addr)
{ {
__io_pbw(); __io_pbw();
__raw_writel(cpu_to_le32(value), PCI_IOBASE + addr); __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
__io_paw(); __io_paw();
} }
#endif #endif