- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Include sys/systm.h after sys/param.h.

Suggested by: pluknet

Put the general logic for being a CPU hog into a new function
should_yield(). Use this in various places. Encapsulate the common
case of check-and-yield into a new function maybe_yield().

Change several checks for a magic number of iterations to use
should_yield() instead.

MFC after: 1 week

For CPUs which ignore TD_CV and support hardware unaliasing don't
bother doing page coloring. This results in a small but measurable
performance improvement in buildworld times.

/* -> /*- for license, minor formatting changes

Properly free the temporary sf_buf in uiomove_fromphys() if a copyin or
copyout fails.

Obtained from: DragonFlyBSD

Correct some uses of the wrong members of the *min()/*max()-familiy, e.g.
min() on unsigned long. None of these are believed to have been fatal though.

Reviewed by: tmm

Remove checks for curthread == NULL - it can't happen.

Move TDF_DEADLKTREAT into td_pflags (and rename it accordingly) to avoid
having to acquire sched_lock when manipulating it in lockmgr(), uiomove(),
and uiomove_fromphys().

Reviewed by: jhb

Remove advertising clause from University of California Regent's
license, per letter dated July 22, 1999 and email from Peter Wemm,
Alan Cox and Robert Watson.

Approved by: core, peter, alc, rwatson

In some cases, sf_buf_alloc() should sleep with pri PCATCH; in others, it
should not. Add a new parameter so that the caller can specify which is
the case.

Reported by: dillon

Add an implementation of uiomove_fromphys() to sparc64. This
implementation could be characterized as a hybrid of the amd64 and i386
implementations. Specifically, the direct virtual-to-physical mapping is
used if possible and sf_buf_alloc() is used if the direct map cannot.