since they are only tested for zero/nonzero; but it's arguably a bad
idea to set a {-1, 0} variable to 1 (as happens in this code).
Found by: Coverity Prevent
and nfs requests processing. Lockmgr lock provides the shared locking for
nfs requests, while exclusive mode is used for modifications. The writer
starvation is handled by lockmgr too.
Reported by: kris, pho, many
Based on the submission by: mohan
Tested by: pho
MFC after: 2 weeks
In the FreeBSD base system, there are only two utilities that use struct
tty, namely pstat and sicontrol. The sicontrol utility calls the
TCSI_TTY ioctl(), which copies struct tty back to userspace.
sicontrol should not have this functionality. The same data is already
provided by pstat. If we really want to be able to export these numbers
through a file descriptor to userspace, we can export struct xtty, which
should provide a better abstraction. The ttystat option was only used as
a debugging aid.
This makes sicontrol compile in the mpsafetty branch.
Reviewed by: peter
Approved by: philip (mentor)
path relative to /usr/include. It looks much better anyway.
Instead of referencing "socket", which is bogus, reference
'sys/socket.h', which is what should be placed here from
the beggining.
Suggested by: maxim
newvers.sh is run pwd is actually the obj directory, so "../../.svn"
doesn't exist and the test always fails. The second is that buildkernel
is executed with a restrictive PATH, so unless you have svnversion in
/bin or /usr/bin it can't run.
Fix this by looking for svnversion in /bin, /usr/bin, and /usr/local/bin
in that order. If found, store the location and derive the value of the
source directory. Then run svnversion in the appropriate directory.
There is one possible refinement which would be to add a test for
LOCALBASE!=/usr/local if we don't find svnversion the first time, but
IMO that's not necessary at this time.
is in little endian form. Likewise setting DC_AL_PAR0/DC_AL_PAR1
register expect the address to be in little endian form. For big
endian architectures the address should be swapped to get correct
one.
Change setting/getting ethernet hardware address to big endian
architecture frendly.
Reported by: Robert Murillo ( billypilgrim782001 at yahoo dot com )
Tested by: Robert Murillo ( billypilgrim782001 at yahoo dot com )
some longstanding issues:
o pass the vap since it's now the "coin of the realm" and required
to do things like set initial tx parameters in private node
state for use prior to association
o pass the mac address as cards that maintain outboard station
tables require this to create an entry (e.g. in ibss mode)
o remove the node table reference, we only have one node table
and it's unlikely this will change so this is not needed to
find the com structure
Cast string precision to `int'. amd64 systems warn about the
field precision being `long int' if we don't, and pathnames are
normally short enough to fit in an `int'.
Noticed by: pav
entry in the SMAP is a 20 byte structure and they are queried from the
BIOS via sucessive BIOS calls. Due to an apparent bug in the R900's
BIOS, for some SMAP requests the BIOS overflows the 20 byte buffer
trashing a few bytes of memory immediately after the SMAP structure. As
a workaround, add 8 bytes of padding after the SMAP structure used in
the loader for SMAP queries.
PR: i386/122668
Submitted by: Mike Hibler mike flux.utah.edu, silby
MFC after: 3 days
o gctl_delete_param() -- intended for parameters that are consumed
by geom(8) itself and which should not be passed to the kernel.
o gctl_has_param() -- intended to check if optional parameters are
present.
Both are needed by gpart(8) to process the optional parameter for
writing bootcode to a partition (as part of the bootcode verb).
However, the kernel is itself not involved in this matter and the
parameter needs to be removed from the request destined for the
kernel.
- Store the softc of the device in the 'si_drv1' of the cdev.
- Lookup the softc via 'si_drv1' in cdev methods rather than using the
minor number as a unit for devclass_get_softc().
- Lookup the device_t via the softc field in cdev methods rather than
using the minor number as a unit for devclass_get_device().
- Add a mutex to the softc to protect 'sc_opened'.
- Remove D_NEEDGIANT as all the smbus drivers are now MPSAFE and this driver
is now MPSAFE.
- Remove some checks for NULL softc pointers that can't happen and don't
bzero the softc during attach.
work. (Moreover, I don't believe that they have ever worked as intended.)
The explanation is fairly simple. Both MADV_DONTNEED and MADV_FREE perform
vm_page_dontneed() on each page within the range given to madvise(). This
function moves the page to the inactive queue. Specifically, if the page is
clean, it is moved to the head of the inactive queue where it is first in
line for processing by the page daemon. On the other hand, if it is dirty,
it is placed at the tail. Let's further examine the case in which the page
is clean. Recall that the page is at the head of the line for processing by
the page daemon. The expectation of vm_page_dontneed()'s author was that
the page would be transferred from the inactive queue to the cache queue by
the page daemon. (Once the page is in the cache queue, it is, in effect,
free, that is, it can be reallocated to a new vm object by vm_page_alloc()
if it isn't reactivated quickly enough by a user of the old vm object.) The
trouble is that nowhere in the execution of either MADV_DONTNEED or
MADV_FREE is either the machine-independent reference flag (PG_REFERENCED)
or the reference bit in any page table entry (PTE) mapping the page cleared.
Consequently, the immediate reaction of the page daemon is to reactivate the
page because it is referenced. In effect, the madvise() was for naught.
The case in which the page was dirty is not too different. Instead of being
laundered, the page is reactivated.
Note: The essential difference between MADV_DONTNEED and MADV_FREE is
that MADV_FREE clears a page's dirty field. So, MADV_FREE is always
executing the clean case above.
This revision changes vm_page_dontneed() to clear both the machine-
independent reference flag (PG_REFERENCED) and the reference bit in all PTEs
mapping the page.
MFC after: 6 weeks
