Instead of caching the ucred reference, just go ahead and eat the
decerement and increment of the refcount. Now that Giant is pushed down
into crfree(), we no longer have to get Giant in the common case. In the
case when we are actually free'ing the ucred, we would normally free it on
the next kernel entry, so the cost there is not new, just in a different
place. This also removse td_cache_ucred from struct thread. This is
still only done #ifdef DIAGNOSTIC.
Tested on: i386, alpha
a bit before handing it over to the OS. I occasionally have 11
segments with several 8K or so fragments depending on nvram settings and
what I have done under loader(8) before booting. This needs to be
revisited.
a language feature that I do not know about. gcc is complaining about
a left shift >= sizeof type, even when shifting a (cast) 64 bit type left
by 43 bits.
lose if a process is preempted while pmap is temporarily switched to
another pmap.
* For SMP, drop the high-fp state when a thread is switched away from
so that if another cpu resumes that thread, it doesn't have to play
games with IPI to get ahold of the correct register values.
* Don't call ast() from interrupt() - if we switch, then we will miss
writing cr.eoi which will prevent the current cpu from receiving
interrupts until the current thread is resumed. The call to ast()
happens magically in exception_restore where it is safe.
* Add DDB 'show irq' command to examine interrupt hardware state.
* Use ptc.g instead of ptc.l so that TLB shootdowns are broadcast to the
coherence domain.
* Use smp_rendezvous for pmap_invalidate_all to ensure it happens on all
cpus.
* Dike out a DIAGNOSTIC printf which didn't compile.
* Protect the internals of pmap_install with cpu_critical_enter/exit.
o In i386's <machine/endian.h>, macros have some advantages over
inlines, so change some inlines to macros.
o In i386's <machine/endian.h>, ungarbage collect word_swap_int()
(previously __uint16_swap_uint32), it has some uses on i386's with
PDP endianness.
Submitted by: bde
o Move a comment up in <machine/endian.h> that was accidentially moved
down a few revisions ago.
o Reenable userland's use of optimized inline-asm versions of
byteorder(3) functions.
o Fix ordering of prototypes vs. redefinition of byteorder(3)
functions, so that the non-GCC (libc asm) case has proper
prototypes.
o Add proper prototypes for byteorder(3) functions in <sys/param.h>.
o Prevent redundant duplicate prototypes by making use of the
_BYTEORDER_PROTOTYPED define.
o Move the bswap16(), bswap32(), bswap64() C functions into MD space
for platforms in which asm versions don't exist. This significantly
reduces the complexity of some things at the cost of duplicate code.
Reviewed by: bde
