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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2007-10-03 15:05:20 +0200
committerHaavard Skinnemoen <hskinnemoen@atmel.com>2007-10-11 13:32:56 +0200
commitbb7aa6d47fcd4f9ab18b4ade2ba078f7719f74ca (patch)
treef44d5d49cf4d95c57e067bd004fe99d072625d7d /drivers/acpi
parent82c54f864fea26c4c44f27e2b4c4d9a811dde299 (diff)
[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>
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