as its cache/tlb management smarts relied too heavily on pre-merge context-
switch behaviour. See PR kern/36548 for one manifestation of the breakage.
To address this:
- Ditch the shadow pmap variables in the PCB (pagedir, l1vec, dacr, cstate)
as it was too easy for them to get out of sync with the pmap.
- Re-write (and fix) the convoluted cpuswitch.S cache/tlb ASM code in C.
It's only slightly less efficient, but is much more readable/maintainable.
- Document cpufuncs.cf_context_switch() as being C-callable.
- pmap_activate() becomes a no-op if the lwp's vmspace is already active.
(Good performance win, since pmap_activate() is now invoked on every
context-switch, even though ARM's cpu_switchto() already does all the
grunt work)
XXX: Some CPU-specific armXX_context_switch() implementations (arm67,
arm7tdmi, arm8) always flush the I+D caches. This should not be necessary.
Someone with access to hardware (acorn32?) needs to deal with this.
the following do not wake other threads early:
pthread_mutex_lock(&mutex);
pthread_cond_broadcast(&cond);
foo = malloc(100); /* takes libc mutexes */
pthread_mutex_unlock(&mutex);
Copy the entire sockaddr to the buffer to be written to user space,
according to its length, not just the part that fits in struct
sockaddr.
This fixes the 'bad MAC address' problem in dhclient.
next ifreq is sizeof(struct ifreq) after the current one unless the
sockaddr is bigger than the union in ifreq that holds it.
In the original 4.4BSD code, this interpretation results in the same
behavior as the "is the sockaddr bigger than struct sockaddr", because
sizeof(struct sockaddr) and sizeof(ifc->ifr_ifru) are the same.
Add comments pointing out problems in the 'need bigger buffer' code,
and copying excessive amounts of data.
Exports some sensors through the envsys(4) framework available
in some Thinkpad laptops.
Ported by Pierre Pronchery from OpenBSD, via PR port-i386/36852.
Tweaks, LKM and misc improvements by me. Added into i386/GENERIC
commented out.
sockaddrs bigger than struct sockaddr. Tightly bind decrementing
available space and using it, avoiding incorrect accounting in an
error case. Document invariants. Document calling convention for
SIOCGIFCONF. Simplify by removing code to handle sockaddrs that don't
fit in struct ifreq; with sockaddr_storage this can no longer occur.
Add several KASSERTs.
This commit resolves the problem with racoon failing to list
interfaces.
Proposed on tech-net@ with no objections.
