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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2008-03-10 12:56:12 +0100
committerHaavard Skinnemoen <hskinnemoen@atmel.com>2008-03-10 13:32:33 +0100
commitbafe68034e3ef5e9f512bd0468001caf34981c41 (patch)
treeadb0234b23fa2f5fac48f704e03a09f047a43c15
parentd395991c117d43bfca97101a931a41d062a93852 (diff)
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>
-rw-r--r--include/asm-avr32/byteorder.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-avr32/byteorder.h b/include/asm-avr32/byteorder.h
index 402ff4125cd..d77b48ba733 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__