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Subject2.3.30 patch

from spinlock.h section.

+/*
+ * Sadly, some early PPro chips require the locked access,
+ * otherwise we could just always simply do
+ *
+ * #define spin_unlock_string \
+ * "movb $0,%0"
+ *
+ * Which is noticeably faster.
+ */

If it's that noticeable, how about a CONFIG option for those of us with
non-broken machines? Distributions keep it as lock;btrl, those making
custom use the faster.

-George Greer


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