which prevents us from doing a "callout_drain()" call. The callout in
question has a lock associated with it and we are not freeing the
callout. That means we can use the "callout_stop()" function to
atomically stop the callback iff the "callout_stop()" function is
called locked. This patch applies proper locking to "callout_stop()"
and replaces a "callout_drain()" with a "callout_stop()".
MFC after: 1 week
witness printouts in the console driver clients can cause this mutex
to recurse by calls to "printf()" from witness for example. In
particular this can happen if "debug.witness.skipspin=0" is set in the
boot environment.
MFC after: 1 week
job
The h_raw application doesn't do proper bounds checking without the option
being supplied via the build, which means that it doesn't throw signals and
fail as expected
PR: 196430
X-MFC with: r276479
roughly 10 years, and the driver has not enjoyed any significant maintenance
since long before that. Despite well-meaning efforts from a number of
people, myself included, it never made the jump to 64-bit and was relegated
to the back-corners of i386. Now its frailty is hampering forward progress
with Clang. Any renewed engineering efforts are of course welcome and can
happen outside of the tree. No MFC of this is planned.
When we started compiling the kernel with -march=armv7 the compiler
started emitting new types of relocation info which are incompatible with
the shared-lib file format used by .ko modules. This workaround prevents
the compiler from emitting the instruction sequences that require the
new relocs. This amounts to using an undocumented internal compiler
flag, so this is just a temporary workaround while we look for a good fix.
PR: 196407
physical address zero. Assume that the lowest page is always mapped
by direct map.
This restores access to the page at zero through /dev/mem after
r263475.
Reported and tested by: neel
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Rename some internal templates to avoid conflict with complier
intrinsics. __is_constructible --> __libcpp_is_constructible,
__is_nothrow_constructible --> __libcpp_is_nothrow_constructible, and
__is_nothrow_assignable --> __libcpp_is_nothrow_assignable. No
functionality change.
Pull in r206805 from upstream libc++ trunk (by Marshall Clow):
Use compiler intrinsic __is_constructible if available
This should fix building parts of world with -std=c++11 enabled.
Reported by: Oliver Hartmann <ohartman@zedat.fu-berlin.de>
MFC after: 1 week
PR20228: don't retain a pointer to a vector element after the
container has been resized.
This fixes a possible crash when compiling certain parts of libc++'s
type_traits header.
the Open Firmware, as provided by petitboot, for example. Note that this is
not quite complete, since RTAS instantiation still depends on callable
firmware.
MFC after: 2 weeks
but not always, identical. In particular, the path entry may contain a
unit address that the name does not. If the FDT node does have an explicit
name property, treat that as an override of the FDT path rather than
ignoring it.
MFC after: 2 weeks
the place where the C dialect is selected. Have a fairly long list
of newly requires warning suppression for clang 3.5.0, also
centralized in kern.mk. Survive the fallout of the removal of
bsd.sys.mk from bsd.kmod.mk.
raft of new warnings that appear to be on by default in clang 3.5.0.
Fix RPI-B build issues with new clang not liking the ability to pass
arbitrary flags to as, since some flags are more arbitrary (and thus
verboten) than others.
These warnings should be actually fixed in the code, but this is a
band-aide to get things (almost) building again.
a) Front load as much work as possible in if_transmit, before any driver
lock or software queue has to get involved.
b) Replace buf_ring with a brand new mp_ring (multiproducer ring). This
is specifically for the tx multiqueue model where one of the if_transmit
producer threads becomes the consumer and other producers carry on as
usual. mp_ring is implemented as standalone code and it should be
possible to use it in any driver with tx multiqueue. It also has:
- the ability to enqueue/dequeue multiple items. This might become
significant if packet batching is ever implemented.
- an abdication mechanism to allow a thread to give up writing tx
descriptors and have another if_transmit thread take over. A thread
that's writing tx descriptors can end up doing so for an unbounded
time period if a) there are other if_transmit threads continuously
feeding the sofware queue, and b) the chip keeps up with whatever the
thread is throwing at it.
- accurate statistics about interesting events even when the stats come
at the expense of additional branches/conditional code.
The NIC txq lock is uncontested on the fast path at this point. I've
left it there for synchronization with the control events (interface
up/down, modload/unload).
c) Add support for "type 1" coalescing work request in the normal NIC tx
path. This work request is optimized for frames with a single item in
the DMA gather list. These are very common when forwarding packets.
Note that netmap tx in cxgbe already uses these "type 1" work requests.
d) Do not request automatic cidx updates every 32 descriptors. Instead,
request updates via bits in individual work requests (still every 32
descriptors approximately). Also, request an automatic final update
when the queue idles after activity. This means NIC tx reclaim is still
performed lazily but it will catch up quickly as soon as the queue
idles. This seems to be the best middle ground and I'll probably do
something similar for netmap tx as well.
e) Implement a faster tx path for WRQs (used by TOE tx and control
queues, _not_ by the normal NIC tx). Allow work requests to be written
directly to the hardware descriptor ring if room is available. I will
convert t4_tom and iw_cxgbe modules to this faster style gradually.
MFC after: 2 months
rather than passing them in by value.
The eventual aim is to do incremental hash construction rather than
all of the memcpy()'ing into a contiguous buffer for the hash
function, which does show up as taking quite a bit of CPU during
profiling.
Tested:
* a variety of laptops/desktop setups I have, with v6 connectivity
Differential Revision: D1404
Reviewed by: bz, rpaulo
Exit with EXIT_FAILURE for invalid arguments.
Fixes NetBSD-PR 43517.
Print version string to stdout instead of stderr;
it is user-requested and not an error.
Obtained from: NetBSD
MFC after: 5 days
end of the actual instruction sequence for the function but before some
misc data in the text segment. This eliminates a strange "size must be
constant" error from the integrated assembler. Also, the build_pagetables
function was missing an END(), but really the problem is that it shouldn't
have an ASENTRY() because it's not a function that needs to be a global
symbol with unwind info and all, it's just a little private subroutine
used in very early kernel init.
