From: Haavard Skinnemoen <hskinnemoen@atmel.com>
Date: Mon, 10 Mar 2008 11:56:12 +0000 (+0100)
Subject: avr32: Work around byteswap bug in gcc < 4.2
X-Git-Tag: v2.6.25-rc8~74^2~2
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=bafe68034e3ef5e9f512bd0468001caf34981c41;p=linux-2.6-omap-h63xx.git

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>
---

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__