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| author | Haavard Skinnemoen <hskinnemoen@atmel.com> | 2008-03-10 12:56:12 +0100 |
|---|---|---|
| committer | Haavard Skinnemoen <hskinnemoen@atmel.com> | 2008-03-10 13:32:33 +0100 |
| commit | bafe68034e3ef5e9f512bd0468001caf34981c41 (patch) | |
| tree | adb0234b23fa2f5fac48f704e03a09f047a43c15 /include/asm-avr32 | |
| parent | d395991c117d43bfca97101a931a41d062a93852 (diff) | |
| download | lwn-bafe68034e3ef5e9f512bd0468001caf34981c41.tar.gz lwn-bafe68034e3ef5e9f512bd0468001caf34981c41.zip | |
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: Haavard Skinnemoen <hskinnemoen@atmel.com>
Diffstat (limited to 'include/asm-avr32')
| -rw-r--r-- | include/asm-avr32/byteorder.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-avr32/byteorder.h b/include/asm-avr32/byteorder.h index 402ff4125cdc..d77b48ba7338 100644 --- a/include/asm-avr32/byteorder.h +++ b/include/asm-avr32/byteorder.h @@ -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__ |