Interrupt driven configuration hooks serve two purposes: they are a
mechanism for registering for a callback that is invoked once interrupt
services are available, and they hold off root device selection so long
as any configuration hooks are still active. Before this change, it was
not possible to safely register additional hooks from the context of a
configuration hook callback. The need for this feature arises when
interrupts are required to discover new devices (e.g. access to the XenStore
to find para-virtualized devices) which in turn also require the ability
to hold off root device selection until some lengthy, interrupt driven,
configuration task has completed (e.g. Xen front/back device driver
negotiation).
More specifically, the mutex protecting the list of active configuration
hooks is never held during a callback, and static information is used
to ensure proper ordering and only a single callback to each hook even
when faced with registration or removal of a hook during an active run.
Sponsored by: Spectra Logic Corporation
MFC after: 1 week.
time-of-day clock or vice versa. For x86 systems, RTC resolution is one
second and we used to lose up to one second whenever we initialize system
time from RTC or write system time back to RTC. With this change, margin
of error per conversion is roughly between -0.5 and +0.5 second rather
than between -1 and 0 second. Note that it does not take care of errors
from getnanotime(9) (which is up to 1/hz second) or CLOCK_GETTIME() latency.
These are just too expensive to correct and it is not worthy of the cost.
case future compile-time knobs were added that it wants to use.
Also add include guards and forward declarations to vm/memguard.h.
Approved by: zml (mentor)
MFC after: 1 month
if the device file appears during or after the link creation.
User created symbolic links are now inserted at the head of the
directory entry list after the "." and ".." entries. A new directory
entry flag DE_COVERED indicates that an entry is covered by a symbolic
link.
PR: kern/114057
Reviewed by: kib
Idea from: kib
Discussed on: freebsd-current (mostly silence)
I used the wrong type when setting st_name in the symbol table entry
struct. It's an Elf64_Word which is defined as an unsigned 32 bit int
on both 32 and 64 bit platforms.
To make things sensible, define some new macros to use as "word" macros
and use those, rather than simply using the explicit 32 bit macros.
As long as interrupts are disabled and there is not explicit call to
sched_add() there can't be any preemption there, thus the calls may be
consistent.
Reported by: kib, jhb
- Enable KX and UX bits on CPU startup for non-boot CPUs
- Keep the KX bit when in userspace - XTLB handler needs it to access
PCPU data
- revert r210638 partly - we don't need to enable KX on kernel entry
now
Reviewed by: jmallett, imp
1. Move dirty bit emulation code that is duplicted for kernel and user
in trap.c to a function pmap_emulate_modified() in pmap.c.
2. While doing dirty bit emulation, it is not necessary to update the
TLB entry on all CPUs using smp_rendezvous(), we can just update the
TLB entry on the current CPU, and let the other CPUs update their TLB
entry lazily if they get an exception.
Reviewed by: alc, neel
per-cpu variants are also available to be called. The per-cpu variants
are needed for some later optimizations.
Also remove unnecessary casts, do some style fixes.
Reviewed by: alc, neel
bufobj lock. If b_bufobj is not NULL, then bufobj lock should be
held when manipulating the flags. Not doing this sometimes leaves
BV_BKGRDINPROG to be erronously set, causing softdep' getdirtybuf() to
stuck indefinitely in "getbuf" sleep, waiting for background write to
finish which is not actually performed.
Add BO_LOCK() in the cases where it was missed.
In collaboration with: pho
Tested by: bz
Reviewed by: jeff
MFC after: 1 month
the worklist (in softdep_process_journal), but also after flushing the
workitems. Might be, we should even do this before bwillwrite() too, but
this seems to be not needed for now.
Fs might be suspended during processing the queue, and then there is
nobody around to unsuspend.
In collaboration with: pho
Tested by: bz
Reviewed by: jeff
If it does, don't then try reprogramming the NF "cap" values (ie
what values are the "maximum" value the NF can be) - instead,
just leave the current CCA value as the NF cap.
This was inspired by some similar work from ath9k. It isn't
a 100% complete solution (as there may be some reason where a
high NF CCA/cap is written, causing the baseband to stop thinking it
is able to transmit, leading to stuck beacon and interface reset)
which I'll investigate and look at fixing in a later commit.
Obtained from: Linux
AR5416 and later chipsets.
ath_hal_calibrateN() calls the HAL calibrateN function with rxchainmask=0x1.
This is not necessarily the case for AR5416 and later chipsets.
use-after-free over a longer time. Also release the backing pages of
a guarded allocation at free(9) time to reduce the overhead of using
memguard(9). Allow setting and varying the malloc type at run-time.
Add knobs to allow:
- randomly guarding memory
- adding un-backed KVA guard pages to detect underflow and overflow
- a lower limit on the size of allocations that are guarded
Reviewed by: alc
Reviewed by: brueffer, Ulrich Spörlein <uqs spoerlein net> (man page)
Silence from: -arch
Approved by: zml (mentor)
MFC after: 1 month
print-jobs which have last-modification times that are in the future.
This shouldn't happen, of course, but it can. And when it did happen,
the previous check could cause completely-spooled jobs to sit in the
queue for 20 minutes per job. The new code waits until the last-modify
time is not changing, instead of making decisions based on the specific
value of last-modify.
MFC after: 2 weeks
o return the correct status in proc_wstatus()
o proc_read takes a void *
o correctly allocate the objs structure array
Sponsored by: The FreeBSD Foundation
For mptest, add delays to I/O that simulate real disks better. This
also allows us to simulate what happens when a device goes away
with active transactions. It's pretty spectacular.
Sponsored by: Panasas
MFC after: 1 month
