FreeBSD/src cd5b07b (r329974)sys/compat/linuxkpi/common/include/asm atomic.h

MFC r329523 and r329524:
Fix implementation of xchg() function macro in the LinuxKPI.
The exchange operation must be atomic.

Sponsored by:   Mellanox Technologies
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+35-6sys/compat/linuxkpi/common/include/asm/atomic.h
+35-61 files

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