give rwlock(9) the ability to crunch different type of structures, with
the only constraint that they have a lock cookie named rw_lock.
This name, then, becames reserved from the struct that wants to use
the rwlock(9) KPI and other locking primitives cannot reuse it for
their members.
Namely such structs are the current struct rwlock and the new struct
rwlock_padalign. The new structure will define an object which has the
same layout of a struct rwlock but will be allocated in areas aligned
to the cache line size and will be as big as a cache line.
For further details check comments on above mentioned revisions.
Reviewed by: jimharris, jeff
Since I've committed this I've receieved roughly an equal
amount of email thanking me for making this change
and asking me to revert it.
I've resisted making this change because
new users tend to prefer less over more
and these users are the least likely to know
how to change the PAGER on their own.
Requested by: many
Objected to: just as many
Decision made by: core
Approved by: cperciva
MFC after: 3 days
* introduce a new HAL API method to pull out the TX status descriptor
contents.
* Add num_delims to the 11n first aggr method. This isn't used by the
driver at the moment so it won't affect anything.
command properly. Without this change, mfi(4) always sends 10 byte READ
and WRITE commands, which will cause data corruption when device is
larger than 2^32 sectors.
PR: kern/173291
Submitted by: Steven Hartland <steven.hartland multiplay.co.uk>
Reviewed by: mav
MFC after: 2 weeks
the previous diradd had already finished it could have been reclaimed
already. This would only happen under heavy dependency pressure.
Reported by: Andrey Zonov <zont@FreeBSD.org>
Discussed with: mckusick
MFC after: 1 week
was still possible to open for write from the lower filesystem. There
is a symmetric situation where the binary could already has file
descriptors opened for write, but it can be executed from the nullfs
overlay.
Handle the issue by passing one v_writecount reference to the lower
vnode if nullfs vnode has non-zero v_writecount. Note that only one
write reference can be donated, since nullfs only keeps one use
reference on the lower vnode. Always use the lower vnode v_writecount
for the checks.
Introduce the VOP_GET_WRITECOUNT to read v_writecount, which is
currently always bypassed to the lower vnode, and VOP_ADD_WRITECOUNT
to manipulate the v_writecount value, which manages a single bypass
reference to the lower vnode. Caling the VOPs instead of directly
accessing v_writecount provide the fix described in the previous
paragraph.
Tested by: pho
MFC after: 3 weeks
provide this information along with messages documentation,
like this done in manual pages for other netgraph nodes.
Submitted by: Mamontov Roman <mr.xanto gmail.com>
all supported debugging bits.
- If DRM_DEBUG_DEFAULT_ON isn't defined, then initialize drm_debug_flag
to zero.
DRM_DEBUG_DEFAULT_ON is defined when module is build with -DDEBUG_DRM
or if kernel config has 'options DEBUG_DRM'.
Reviewed by: kib
Instead, add protocol specific mbuf flags M_IP_NEXTHOP and
M_IP6_NEXTHOP. Use them to indicate that the mbuf's chain
contains the PACKET_TAG_IPFORWARD tag. And do a tag lookup
only when this flag is set.
Suggested by: andre
floppies.
Its unlikely that anyone actually uses these or cares about these
anymore, since we support other floppy types and this change doesn't
hurt - just add it.
PR: conf/40777
Submitted by: Antti Kantee <pooka@cubical.fi>
Arrival-Date: Fri Jul 19 08:50:02 PDT 2002
Approved by: cperciva (implicit)
MFC after: 1 week
Add software mixer table for FastTrack Ultra.
Only set volume controls which are valid at startup for standard
USB audio devices, so that settings like treble and bass use
the reset defaults.
MFC after: 1 week
PCM API doesn't support showing all the knobs. Make sure all the USB audio
mixer nodes are freed at detach. Before this patch USB audio would leak
some memory at detach. Print out buffer sizes in number of samples at attach.
Fix setting of volume controls when the number of channels is greater than two.
MFC after: 1 week
the call to pmap_remove_all() within vm_page_cache() is usually redundant.
This change eliminates that call to pmap_remove_all() and introduces a
call to pmap_remove_all() before vm_page_cache() in the one place where
it didn't already exist.
When iterating over a paging queue, if the object containing the current
page has a zero reference count, then the page can't have any managed
mappings. So, a call to pmap_remove_all() is pointless.
Change a panic() call in vm_page_cache() to a KASSERT().
MFC after: 6 weeks
%gs, when supported. Note that WRFSBASE and WRGSBASE are not very
useful on FreeBSD right now, because a return from the kernel mode to
userspace reloads the bases specified by the sysarch(2) syscall, most
likely.
Enable the Supervisor Mode Execution Prevention (SMEP) when
supported. Since the loader(8) performs hand-off to the kernel with
the page tables which contradict the SMEP, postpone enabling the SMEP
on BSP until pmap switched for the proper kernel tables.
Debugged with the help from: avg
Tested by: avg, Michael Moll <kvedulv@kvedulv.de>
MFC after: 1 month
introduced with the IvyBridge CPUs. Provide the definitions for new
bits in CR3 and CR4 registers.
Tested by: avg, Michael Moll <kvedulv@kvedulv.de>
MFC after: 2 weeks
