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Commit c1217a75 authored by Kirill Korotaev's avatar Kirill Korotaev Committed by Thomas Gleixner
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x86: mark read_crX() asm code as volatile 

Some gcc versions (I checked at least 4.1.1 from RHEL5 & 4.1.2 from gentoo)
can generate incorrect code with read_crX()/write_crX() functions mix up,
due to cached results of read_crX().

The small app for x8664 below compiled with -O2 demonstrates this
(i686 does the same thing):
parent f891dd18
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