tree f44d5d49cf4d95c57e067bd004fe99d072625d7d
parent 82c54f864fea26c4c44f27e2b4c4d9a811dde299
author Haavard Skinnemoen <hskinnemoen@atmel.com> 1191416720 +0200
committer Haavard Skinnemoen <hskinnemoen@atmel.com> 1192102376 +0200

[AVR32] Don't use __builtin_xchg()

The implementation of __builtin_xchg() in at least some versions of
avr32 gcc is buggy. Rather than find out exactly which versions that
have this bug, let's just avoid the problem altogether by implementing
xchg() in inline assembly.

Also, in most architectures, xchg() seems to imply a memory barrier,
while the existing avr32 implementation did not. This patch also fixes
that discrepancy.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>