first calls mmap() with the arguments PROT_NONE and MAP_ANON to reserve a
single, contiguous range of virtual addresses for the entire shared library.
Later, rtld calls mmap() with the the shared library's file descriptor
and the argument MAP_FIXED to place the text and data sections within the
reserved range. The rationale for mapping shared libraries in this way is
explained in the commit message for Revision 190885. However, this approach
does have an unintended, negative consequence. Since the first call to
mmap() specifies MAP_ANON and not the shared library's file descriptor, the
kernel has no idea what alignment the vm object backing the file prefers.
As a result, the reserved range's alignment is unlikely to be the same as
the vm object's, and so mapping with superpages becomes impossible. To
address this problem, this revision adds the argument MAP_ALIGNED_SUPER to
the first call to mmap() if the text section is larger than the smallest
superpage size.
To determine if the text section is larger than the smallest superpage
size, rtld must always fetch the page size information. As a result, the
private code for fetching the base page size in rtld's builtin malloc is
redundant. Eliminate it. Requested by: kib
Tested by: zbb (on arm)
Reviewed by: kib (an earlier version)
Discussed with: jhb
all FreeBSD versions, not just 10.x and earlier. Apparently too many
people seem to have trouble with post-1993 formats.
Also remove the related notes about messing with kernel configuration
files from UPDATING, which are now superfluous.
Requested by: many
MFC after: 3 days
variables. These are intended to allow bypassing the
'svn co /usr/{src,doc,ports}' step in the chroot when the
tree exists from external means.
The use case here is that /usr/src, /usr/doc, and /usr/ports
in the chroot exist as result of zfs dataset clones, so it
is possible (and happens quite often) that the included
distributions may not be consistent. (This is not the case
for -RELEASE builds, but does happen for snapshot builds.)
Tested on: stable/9@r264319
MFC After: 3 days
Sponsored by: The FreeBSD Foundation
- remove redundant code
- remove erroneous setting of the error return
in vmmdev_ioctl()
- use style(9) initialization
- in vmx_inject_pir(), document the race condition
that the final conditional statement was detecting,
Tested with both gcc and clang builds.
Reviewed by: neel
This KASSERT() existed as a sanity check that upper layers in the network
stack (e.g. inet, inet6) had released their reference to the underlying
driver's multicast memberships (ifmultiaddr{}). However it assumes the
lifecycle of the driver membership corresponds to the lifecycle of the
network layer membership.
In the submitter's case, ieee80211_ioctl_updatemulti() attempts to
reprogram the (parent, physical) ifnet{} memberships in response
to a change in membership on the (child, virtual) VAP ifnet, using
a batched update mechanism. These updates happen independently from
the network layer, causing a "false negative" assertion failure.
There are possibly other use cases where this KASSERT() may be triggered
by other networking stack activity (e.g. where a nesting relationship
exists between multiple ifnet{} instances). This suggests that further
review of FreeBSD's approach to nested ifnet relationships is needed.
MFC after: 6 weeks
Submitted by: adrian@
walks the list of connections in TIME_WAIT closing expired connections
due to contention on the global TCP pcbinfo lock.
To remediate, introduce a new global lock to protect the list of
connections in TIME_WAIT. Only acquire the TCP pcbinfo lock when
closing an expired connection. This limits the window of time when
TCP input processing is stopped to the amount of time needed to close
a single connection.
Submitted by: Julien Charbon <jcharbon@verisign.com>
Reviewed by: rwatson, rrs, adrian
MFC after: 2 months
Previously ${COMPILER_TYPE} was checked in sys/boot/amd64, and the efi
subdirectory was skipped altogether for gcc (since GCC does not support
a required attribute). However, during the early buildworld stages
${COMPILER_TYPE} is the existing system compiler (i.e., gcc on 9.x build
hosts), not the compiler that will eventually be used. This caused
"make obj" to skip the efi subdirectory. In later build stages
${COMPILER_TYPE} is "clang", and then the efi loader would attempt to
build in the source directory.
Sponsored by: The FreeBSD Foundation
This caused incorrect behavior of arrays with big-endian DDF metadata.
Little-endian (like used by Adaptec controllers) should not be harmed.
Add workaround should be enough to manage compatibility.
MFC after: 2 weeks
Unfortunately we can't check range collisions for UNMAP commands alike
to writes, because they include multiple ranges, which are also passed
in data block, not in CDB. As result, UNMAP commands have to be treated
as colliding with any other command accessing the media.
From the other side all UNMAPs are equal (we don't support ANCHOR flag),
so we can execute several UNMAPs same time.
This code was heavily broken few months ago during CAM locking changes.
Fixing it would require almost complete rewrite. Since there are no
known devices on market using this interface younger then ~15 years, and
they are CD, not even DVD, I don't see much reason to rewrite it.
This change does not mean those devices won't work. They will just work
slower due to inefficient disks load/unload schedule if several LUNs
accessed same time.
Discussed with: ken@
Silence on: scsi@, hardware@
MFC after: 1 week
motherboard. PHY hardware used for the controller responded at
all possible addresses which in turn resulted in having 32 PHYs
for the controller. If driver detects "MSI K9N6PGM2-V2 (MS-7309)"
motherboard, tell miibus(4) PHY is located at 0.
Tested by: Chris H
binmisc code to be build on amd64/i386 for the kernel.
Update NOTES with some indication of what this code is used for.
Pointed out by jhb@ ... thanks!
Submitted by: jhb@
0xff. Some guests may attempt to read from this port to identify
psuedo-PNP ISA devices. (The ie(4) driver in FreeBSD/i386 is one
example.)
Reviewed by: grehan
This patch adds support for three new SCSI commands: UNMAP, WRITE SAME(10)
and WRITE SAME(16). WRITE SAME commands support both normal write mode
and UNMAP flag. To properly report UNMAP capabilities this patch also adds
support for reporting two new VPD pages: Block limits and Logical Block
Provisioning.
UNMAP support can be enabled per-LUN by adding "-o unmap=on" to `ctladm
create` command line or "option unmap on" to lun sections of /etc/ctl.conf.
At this moment UNMAP supported for ramdisks and device-backed block LUNs.
It was tested to work great with ZFS ZVOLs. For file-backed LUNs UNMAP
support is unfortunately missing due to absence of respective VFS KPI.
Reviewed by: ken
MFC after: 1 month
Sponsored by: iXsystems, Inc
execution to a emumation program via parsing of ELF header information.
With this kernel module and userland tool, poudriere is able to build
ports packages via the QEMU userland tools (or another emulator program)
in a different architecture chroot, e.g. TARGET=mips TARGET_ARCH=mips
I'm not connecting this to GENERIC for obvious reasons, but this should
allow the kernel module to be built by default and enable the building
of the userland tool (which automatically loads the kernel module).
Submitted by: sson@
Reviewed by: jhb@
