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Commit bafe6803 authored by Haavard Skinnemoen's avatar Haavard Skinnemoen
Browse files

avr32: Work around byteswap bug in gcc < 4.2 



gcc versions earlier than 4.2 sign-extends the result of le16_to_cpu()
and friends when we implement __arch__swabX() using
__builtin_bswap_X(). Disable our arch-specific optimizations when those
gcc versions are being used.

Signed-off-by: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
parent d395991c

include/asm-avr32/byteorder.h

+6 −0
Original line number Diff line number Diff line
@@ -12,8 +12,14 @@ extern unsigned long __builtin_bswap_32(unsigned long x); 
extern unsigned short __builtin_bswap_16(unsigned short x);

#endif



/*

 * avr32-linux-gcc versions earlier than 4.2 improperly sign-extends

 * the result.

 */

#if !(__GNUC__ == 4 && __GNUC_MINOR__ < 2)

#define __arch__swab32(x) __builtin_bswap_32(x)

#define __arch__swab16(x) __builtin_bswap_16(x)

#endif



#if !defined(__STRICT_ANSI__) || defined(__KERNEL__)

# define __BYTEORDER_HAS_U64__