Commit Graph

189433 Commits

Author SHA1 Message Date
Glen Barber
8c89d53018 MFC r282112:
Fix a comment.

Sponsored by:	The FreeBSD Foundation
2015-04-30 00:34:41 +00:00
John Baldwin
4860da78ac MFC 280721:
Allow additional flags to be passed to netstat -i in the daily status check.
In particular, this allows an administrator to specify "-h" for human
readable output if that is preferred.

The default setting passes "-d", so that can be excluded by using a custom
setting.
2015-04-29 18:57:19 +00:00
Glen Barber
2c8a8b73a1 Document r282199, drm update to match Linux 3.8.13.
Sponsored by:	The FreeBSD Foundation
2015-04-29 16:15:38 +00:00
Glen Barber
875a6ad6f7 Document r280632, kern.osreldate now configurable jail(8) parameters.
Sponsored by:	The FreeBSD Foundation
2015-04-29 16:15:36 +00:00
Glen Barber
6c8076309b Document r278608, bcm2835_cpufreq driver addition.
Sponsored by:	The FreeBSD Foundation
2015-04-29 16:15:34 +00:00
Glen Barber
444d09ca06 Document r277592, file(1) update to version 5.22.
Sponsored by:	The FreeBSD Foundation
2015-04-29 16:15:32 +00:00
Pedro F. Giffuni
877736eadf MFC r281857:
_pthread_cleanup_push: fix allocator sizeof operand mismatch

Same fix appears to be in DragonFly's libthread_xu.

Found by:	Clang Static Analyzer
2015-04-29 15:33:07 +00:00
Pedro F. Giffuni
99b44427ad MFC r281875:
libgeom: plug memory leak in EndElement.

CID:		1016696
Found by:	Clang static checker
2015-04-29 15:26:58 +00:00
Jean-Sébastien Pédron
83559633d5 drm: Allow parallel builds of drivers and firmwares
Submitted by:	hps@
MFC of:		r279600
2015-04-29 12:54:21 +00:00
Devin Teske
0b449b3a80 MFC r281780: Update usage statement; align with post-r279624. 2015-04-28 22:32:52 +00:00
Glen Barber
d3ce4eab4b Document r281255, devfs(5) read/write update timestamp
precision.

Sponsored by:	The FreeBSD Foundation
2015-04-28 21:58:11 +00:00
Jean-Sébastien Pédron
23d9fcab40 drm: Update the device-independent code to match Linux 3.8.13
This update brings few features:
    o  Support for the setmaster/dropmaster ioctls. For instance, they
       are used to run multiple X servers simultaneously.
    o  Support for minor devices. The only user-visible change is a new
       entry in /dev/dri but it is useless at the moment. This is a
       first step to support render nodes [1].

The main benefit is to greatly reduce the diff with Linux (at the
expense of an unreadable commit diff). Hopefully, next upgrades will be
easier.

No updates were made to the drivers, beside adapting them to API
changes.

[1] https://en.wikipedia.org/wiki/Direct_Rendering_Manager#Render_nodes

r280814 is merged at the same time to avoid a short window where RANDR
might be broken:

drm: Import Linux commit 9bc3cd5673d84d29272fa7181a4dfca83cbb48c1

Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Fri May 31 12:17:08 2013 +0000

    drm: Sort connector modes based on vrefresh

    Keeping the modes sorted by vrefresh before the pixel clock makes the
    mode list somehow more pleasing to the eye.

    Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

PR:		198936 (r280814)
Tested by:	Many people
MFC of:		r280183, r280187 (original commit by glebius), r280814
Relnotes:	yes
2015-04-28 19:35:05 +00:00
Glen Barber
34bc9c6f84 Fix a whitespace nit.
Sponsored by:	The FreeBSD Foundation
2015-04-28 18:12:10 +00:00
Glen Barber
ba650c2149 Update svn revision marker.
Sponsored by:	The FreeBSD Foundation
2015-04-28 18:12:08 +00:00
Glen Barber
cd9f9141d6 Document r281957, hptnr(4) driver updated to version 1.1.1.
Sponsored by:	The FreeBSD Foundation
2015-04-28 18:12:05 +00:00
Glen Barber
62323484da Document r281936, disallow ar(1) directory traversal.
Sponsored by:	The FreeBSD Foundation
2015-04-28 18:12:03 +00:00
Glen Barber
e6a1f9cc53 Document r281843, GELI passphrase prompt support in loader.
Sponsored by:	The FreeBSD Foundation
2015-04-28 18:12:01 +00:00
Glen Barber
9fceabd77a Document r281687, ACPI update to 20150410.
Sponsored by:	The FreeBSD Foundation
2015-04-28 18:11:59 +00:00
Glen Barber
55eb065886 Document r281161, '-R' flag added to netstat(8).
Add Limelight Networks to sponsors.ent.

Sponsored by:	The FreeBSD Foundation
2015-04-28 18:11:56 +00:00
Glen Barber
3bb53d6a32 Document r281075, ACPICA update to version 20150204.
Sponsored by:	The FreeBSD Foundation
2015-04-28 18:11:54 +00:00
Glen Barber
a5cadd46ff Document r281044, fix directory inclusion when '--one-file-system'
is specified.

Sponsored by:	The FreeBSD Foundation
2015-04-28 18:11:51 +00:00
Glen Barber
0027fa6e78 Document r280392, make sure that setmode sets errno on failure.
Sponsored by:	The FreeBSD Foundation
2015-04-28 18:11:49 +00:00
Glen Barber
8488b7e518 Document r280370, DSM TRIM support for virtual AHCI disks.
Sponsored by:	The FreeBSD Foundation
2015-04-28 18:11:47 +00:00
Glen Barber
2b3e28664a Document r280304, OpenSSL update to version 1.0.1m.
Sponsored by:	The FreeBSD Foundation
2015-04-28 18:11:45 +00:00
Ed Maste
09ac1975fc MFC r277877: Use zero register instead of immediate 0x0 in MIPS assembly
It seems GAS makes the substitution automatically, but Clang's
  integrated assembler does not (yet). It fails with "invalid operand for
  instruction."
2015-04-28 12:52:08 +00:00
Ed Maste
391bd93d91 MFC r281107: MIPS rtld: report missing symbol rather than segfaulting
This is only an interim fix; MIPS should be using the MI code instead,
  which does not have this issue.
2015-04-28 12:48:30 +00:00
Jean-Sébastien Pédron
d53f53a4bc DRM2: fix off-by-one overflow in ioctl processing
Call to the driver-specific ioctl used to process ioctl number
that will lead to the out-of-bounds access to the ioctl handler
array.

PR:             193367
Approved by:    kib
MFC of:		r275209 (original commit by rea)
2015-04-28 12:37:09 +00:00
Jean-Sébastien Pédron
e07c5ce784 drm: Import Linux commit b7ea85a4fed37835eec78a7be3039c8dc22b8178
Author: Huacai Chen <chenhc@lemote.com>
Date:   Tue May 21 06:23:43 2013 +0000

    drm: fix a use-after-free when GPU acceleration disabled

    When GPU acceleration is disabled, drm_vblank_cleanup() will free the
    vblank-related data, such as vblank_refcount, vblank_inmodeset, etc.
    But we found that drm_vblank_post_modeset() may be called after the
    cleanup, which use vblank_refcount and vblank_inmodeset. And this will
    cause a kernel panic.

    Fix this by return immediately if dev->num_crtcs is zero. This is the
    same thing that drm_vblank_pre_modeset() does.

    Call trace of a drm_vblank_post_modeset() after drm_vblank_cleanup():
    [   62.628906] [<ffffffff804868d0>] drm_vblank_post_modeset+0x34/0xb4
    [   62.628906] [<ffffffff804c7008>] atombios_crtc_dpms+0xb4/0x174
    [   62.628906] [<ffffffff804c70e0>] atombios_crtc_commit+0x18/0x38
    [   62.628906] [<ffffffff8047f038>] drm_crtc_helper_set_mode+0x304/0x3cc
    [   62.628906] [<ffffffff8047f92c>] drm_crtc_helper_set_config+0x6d8/0x988
    [   62.628906] [<ffffffff8047dd40>] drm_fb_helper_set_par+0x94/0x104
    [   62.628906] [<ffffffff80439d14>] fbcon_init+0x424/0x57c
    [   62.628906] [<ffffffff8046a638>] visual_init+0xb8/0x118
    [   62.628906] [<ffffffff8046b9f8>] take_over_console+0x238/0x384
    [   62.628906] [<ffffffff80436df8>] fbcon_takeover+0x7c/0xdc
    [   62.628906] [<ffffffff8024fa20>] notifier_call_chain+0x44/0x94
    [   62.628906] [<ffffffff8024fcbc>] __blocking_notifier_call_chain+0x48/0x68
    [   62.628906] [<ffffffff8042d990>] register_framebuffer+0x228/0x260
    [   62.628906] [<ffffffff8047e010>] drm_fb_helper_single_fb_probe+0x260/0x314
    [   62.628906] [<ffffffff8047e2c4>] drm_fb_helper_initial_config+0x200/0x234
    [   62.628906] [<ffffffff804e5560>] radeon_fbdev_init+0xd4/0xf4
    [   62.628906] [<ffffffff804e0e08>] radeon_modeset_init+0x9bc/0xa18
    [   62.628906] [<ffffffff804bfc14>] radeon_driver_load_kms+0xdc/0x12c
    [   62.628906] [<ffffffff8048b548>] drm_get_pci_dev+0x148/0x238
    [   62.628906] [<ffffffff80423564>] local_pci_probe+0x5c/0xd0
    [   62.628906] [<ffffffff80241ac4>] work_for_cpu_fn+0x1c/0x30
    [   62.628906] [<ffffffff802427c8>] process_one_work+0x274/0x3bc
    [   62.628906] [<ffffffff80242934>] process_scheduled_works+0x24/0x44
    [   62.628906] [<ffffffff8024515c>] worker_thread+0x31c/0x3f4
    [   62.628906] [<ffffffff802497a8>] kthread+0x88/0x90
    [   62.628906] [<ffffffff80206794>] kernel_thread_helper+0x10/0x18

    Signed-off-by: Huacai Chen <chenhc@lemote.com>
    Signed-off-by: Binbin Zhou <zhoubb@lemote.com>
    Cc: <stable@vger.kernel.org>
    Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
    Acked-by: Paul Menzel <paulepanter@users.sourceforge.net>
    Signed-off-by: Dave Airlie <airlied@gmail.com>

Reported by:    J.R. Oldroyd <fbsd@opal.com>
MFC of:		r279599
2015-04-28 12:02:24 +00:00
Ed Maste
5a416dd467 MFC r281005: Make die available as rtld_die for use by MD relocation code
Sponsored by:	The FreeBSD Foundation
2015-04-28 01:15:17 +00:00
Glen Barber
f3e8c4299d MFC r280299, r280840, r280846, r280879, r280881, r280884, r280928,
r281783, r281809, r281832:

 r280299 (cperciva):
  When creating VM images, copy the contents of the created filesystem
  into a new filesystem before packaging it into a disk image.  This
  prevents "remnants" of deleted files from showing up in the VM images,
  and reduces their compressed size (by about 10% for the cloudware
  images) as a result.

 r280840 (cperciva):
  Clean up filesystem unmounting in vmimage builds:
  - Remove vm_umount_base function which is currently unused.
  - Add umount_loop function which loops attempting to unmount one
    filesystem.
  - Replace calls to umount with calls to umount_loop.
  - Don't attempt to unmount ${DESTDIR}/dev if it isn't mounted.

  The looping is necessary because sometimes umount fails due to
  filesystems being busy.  The most common cause of such busyness is
  periodic(8) jobs running `find / ...`.

 r280846 (cperciva):
  Improve check for whether ${DESTDIR}/dev is mounted.

 r280879 (cperciva):
  Add bits for building EC2 disk images.

 r280881 (cperciva):
  Partially revert r278118 now that the required logic for deciding
  whether freebsd-update can be useful has moved into the
  firstboot_freebsd_update script.

 r280884 (cperciva):
  Fix pkg(8) command line in vm_extra_pre_umount().

 r280928 (cperciva):
  Add code for creating an EC2 AMI.

 r281783:
  When building VM disk images, vm_copy_base() uses tar(1) to copy
  the userland from one md(4)-mounted filesystem to a clean filesystem
  to prevent remnants of files that were added and removed from
  resulting in an unclean filesystem.  When newfs(8) creates the first
  filesystem with journaled soft-updates enabled, the /.sujournal file
  in the new filesystem cannot be overwritten by the /.sujournal in the
  original filesystem.

  To avoid this particular error case, do not enable journaled
  soft-updates when creating the md(4)-backed filesystems, and instead
  use tunefs(8) to enable journaled soft-updates after the new
  filesystem is populated in vm_copy_base().

  While here, fix a long standing bug where the build environment /boot
  files were used by mkimg(1) when creating the VM disk images by using
  the files in .OBJDIR.

 r281809:
  Simplify variable expansion in attempt to fix the vm-image build.

 r281832:
  Fix locating the /boot files.

Sponsored by:	The FreeBSD Foundation
2015-04-27 19:41:40 +00:00
Pedro F. Giffuni
03c6427eaa MFC r281769:
g_uncompress_taste: prevent a double free.

Found by:	Clang Static Analyzer
2015-04-27 14:59:31 +00:00
Konstantin Belousov
d5da5622d1 MFC r272290 (by mjg):
Use bzero instead of explicitly zeroing stuff in do_execve.
2015-04-27 12:54:04 +00:00
Konstantin Belousov
23ff8662d4 MFC r281762:
Remove duplicate definitions of MWAIT_CX hints.  Identical defines in
specialreg.h are enough.
2015-04-27 08:06:33 +00:00
Konstantin Belousov
e3b8ae8988 MFC r281495:
Add config option PAE_TABLES for the i386 kernel.  It switches pmap to
use PAE format for the page tables, but does not incur other
consequences of the full PAE config.  In particular, vm_paddr_t and
bus_addr_t are left 32bit, and max supported memory is still limited
by 4GB.

The option allows to have nx permissions for memory mappings on i386
kernel, while keeping the usual i386 KBI and avoiding the kernel data
sizing problems typical for the PAE config.
2015-04-27 08:02:12 +00:00
Xin LI
6dc1527c43 MFC r281500,281540,281626:
Sync with NetBSD:
 - Mention xz(1) in gzip(1).
 - Strip away path from header name when decompressing.
2015-04-27 05:49:18 +00:00
Xin LI
e0d9e55807 MFC r281502:
Sync with OpenBSD: Use volatile instead of __volatile__.
2015-04-27 05:42:14 +00:00
Konstantin Belousov
9aa3ed9771 MFC r281712:
Make wait6(2), waitid(3) and ppoll(2) cancellation points.
2015-04-25 08:14:08 +00:00
Konstantin Belousov
0ece765d2b MFC r281696:
Initialize td_sel in the thread_init().

PR:	199518
2015-04-25 08:06:21 +00:00
Konstantin Belousov
4db3b46de2 MFC r281883:
Handle incorrect ELF images specifying size for PT_GNU_STACK not being
multiple of page size.
2015-04-25 08:03:36 +00:00
Alexander Motin
ff4d1f5cef MFC r281698:
Do not report stripe size if it is equal to sector size.
2015-04-25 06:49:18 +00:00
Enji Cooper
f628ad08fe MFC r261550,r281354,r281355,r281356,r281358,r281359,r281360,r281361,r281362,r281391,r281392,r281393,r281394,r281395,r281397,r281398,r281399,r281400,r281401,r281402,r281403,r281404,r281407,r281408,r281409,r281410,r281411:
r261550 (by glebius):

Add test case for kern/181741. Right now test fails.

PR:		181741
Sponsored by:	Nginx, Inc.

r281354:

Fix warnings, fix a typo in a testcase description, bump WARNS to 3

- Remove argc/argv (-Wunused)
- Cast len in comparison to size_t (-Wsign-compare)

Sponsored by: EMC / Isilon Storage Division

r281355:

Fix -Wunused warnings, bump WARNS to 6

The testcase fails today on subtest # 9

The output is still broken if prove -rv is run and the testcase aborts
prematurely (the testcase doesn't really conform to TAP protocol properly,
except when it completes fully)

Sponsored by: EMC / Isilon Storage Division

r281356:

Fix -Wunused warnings, bump WARNS to 6

The output is still broken if prove -rv is run and the testcase aborts
prematurely with fail_assertion (the testcase doesn't really conform to TAP
protocol properly, except when it completes fully)

Sponsored by: EMC / Isilon Storage Division

r281358:

- Parameterize out the number of accept/connect attempts
- Randomize the bind port to allow 2+ consecutive calls in < 10 minutes, and
  to also not fail if (for instance) there's a server already listening on port
  8080
- Don't leak the listening socket / fds into the child process
- Fix warnings:
-- Remove argc/argv (-Wunused)
-- Mark sig __unused (-Wunused)
-- Mark quit static (-Wmissing-variable-declarations)

Sponsored by: EMC / Isilon Storage Division

r281359:

Remove argc/argv (-Wunused)

Sponsored by: EMC / Isilon Storage Division

r281360:

Fix warnings

- Remove argc/argv (-Wunused)
- Mark some parameters to socket_listen_update __unused (-Wunused)

Sponsored by: EMC / Isilon Storage Division

r281361:

Remove argc/argv (-Wunused)

Sponsored by: EMC / Isilon Storage Division

r281362:

Use _exit, not exit in forked process

Sponsored by: EMC / Isilon Storage Division

r281391:

- Use static buffers for temporary file paths instead of strdup of constant strings
- Don't use /tmp because it's outside ATF's prescribed sandbox
- Use mkstemp instead of mktemp to eliminate warning

Sponsored by: EMC / Isilon Storage Division

r281392:

- Garbage collect argc/argv (-Wunused)
- Bump WARNS to 6

Sponsored by: EMC / Isilon Storage Division

r281393:

Fix warnings and bump WARNS to 6
- Garbage collect argc/argv (-Wunused)
- sleep(3) will always return an unsigned int; don't check for return codes <0
  (-Wsign-compare)

Sponsored by: EMC / Isilon Storage Division

r281394:

- Don't use /tmp because it's outside ATF's prescribed sandbox
- Replace a hardcoded PATH_MAX value with sizeof(path)
- Use path like an array, not a pointer, and always try to unlink it in cleanup

Sponsored by: EMC / Isilon Storage Division

r281395:

Fix a -Wuninitialized warning by setting the socket to -1 and bump WARNS to 6

Sponsored by: EMC / Isilon Storage Division

r281397:

Mark signum unused in signal_handler; bump WARNS to 6

Sponsored by: EMC / Isilon Storage Division

r281398:

Garbage collect argc/argv and bump WARNS to 6

Sponsored by: EMC / Isilon Storage Division

r281399:

Fix warnings and bump WARNS to 6
- Staticize variables as needed
- Garbage collect argc/argv
- Fix -Wsign-compare warnings by casting small sizeof to (int)

Sponsored by: EMC / Isilon Storage Division

r281400:

- Garbage collect argc/argv; bump WARNS to 6
- Make the socket path random and move it out of /tmp as that's outside ATF's
  prescribed path

Sponsored by: EMC / Isilon Storage Division

r281401:

- Garbage collect argc/argv
- Use random paths instead of one in /tmp

Sponsored by: EMC / Isilon Storage Division

r281402:

Garbage collect argc/argv and bump WARNS to 6

Sponsored by: EMC / Isilon Storage Division

r281403:

Garbage collect argc/argv and bump WARNS to 6

Sponsored by: EMC / Isilon Storage Division

r281404:

Generate temporary files with mkstemp instead of mktemp

Sponsored by: EMC / Isilon Storage Division

r281407:

Fix the knob twiddling to work properly per src.opts.mk

Sponsored by: EMC / Isilon Storage Division

r281408:

- Remove the .t wrapper and put the "magic" of determining the number of
  testcases into the .c file
- Require root for now because it fails with SOCK_RAW without root privileges
- Increment the test count properly on socket create failure

Sponsored by: EMC / Isilon Storage Division

r281409:

Fix warnings, bump WARNS to 6, and use a temporary socket instead of one in /tmp

Sponsored by: EMC / Isilon Storage Division

r281410:

Fix more warnings I didn't catch in the first go-around

Sponsored by: EMC / Isilon Storage Division

r281411:

Fix even more warnings..

Sponsored by: EMC / Isilon Storage Division
2015-04-25 05:31:52 +00:00
Enji Cooper
89d0270f37 MFC r280893:
Cleanup and do minor refactoring before converting testcases to ATF

- Convert errx(-1, ..) to errx(1, ..)
- Move the aio(4) checks to a single function (aio_available); use modfind(2)
  instead of depending on SIGSYS (doesn't work when aio(4) support is missing,
  not documented in the aio syscall manpages).
- Use aio_available liberally in the testcase functions
- Use mkstemp(3) + unlink(2) instead of mktemp(3)
- Fix some -Wunused warnings
- Bump WARNS to 6

Submitted by: mjohnston [*]
Sponsored by: EMC / Isilon Storage Division
2015-04-25 04:49:45 +00:00
Enji Cooper
dbe60ae012 MFC r280475:
The number of commands added when ddb(4) is enabled is 3, not 2

Sponsored by: EMC / Isilon Storage Division
2015-04-25 04:40:08 +00:00
Rui Paulo
b813f38994 MFC r281704:
Synaptics: don't report the middle button when clickPad is used.
2015-04-25 01:23:29 +00:00
Rui Paulo
24557749f0 MFC r281544:
snd_hda: add support for the Lenovo X1 20BS model.

  This requires a patch to redirect the output to a separate DAC when
  the headphones are used.  While there, add device strings for Intel
  Broadwell HDA controllers and Realtek ALC292 codecs.
2015-04-25 01:11:33 +00:00
Pedro F. Giffuni
640a0c47fc MFC r281795:
scsi_parse_transportid_rdma(): fix mismatch in memory access size.

Independently found by Coverity and gcc49.

CID:		1230006
Reviewed by:	ken
2015-04-25 00:58:19 +00:00
Xin LI
ca585570ba MFC r281667:
Remove vfs.zfs.snapshot_list_prefetch, the corresponding code was
gone in r248571 already.
2015-04-25 00:36:43 +00:00
Xin LI
a471e5a660 MFC r281387:
Merge changes from vendor driver version 1.1.1:

v1.1.1 2015-03-26
 * Support 4Kn drive.
 * Change the SCSI target ID of the disk to be the index of physical
   connetion to the HBA.
 * Support staggered drive spin up.
 * Fix a bug that command would be timeout because of improper
   interrupt service routine.
 * Error handling to avoid scsi command lost which caused system
   hang up.
 * Fix a bug that fail to get the devcie's serial number via
   FreeNAS WebGUI.

Many thanks to HighPoint for continued support of FreeBSD!

Relnotes:	yes
2015-04-25 00:32:47 +00:00
Hiren Panchasara
8978b18bf3 MFC r275358 r275483 r276982 - Removing M_FLOWID by hps@
r275358:
Start process of removing the use of the deprecated "M_FLOWID" flag
from the FreeBSD network code. The flag is still kept around in the
"sys/mbuf.h" header file, but does no longer have any users. Instead
the "m_pkthdr.rsstype" field in the mbuf structure is now used to
decide the meaning of the "m_pkthdr.flowid" field. To modify the
"m_pkthdr.rsstype" field please use the existing "M_HASHTYPE_XXX"
macros as defined in the "sys/mbuf.h" header file.

This patch introduces new behaviour in the transmit direction.
Previously network drivers checked if "M_FLOWID" was set in "m_flags"
before using the "m_pkthdr.flowid" field. This check has now now been
replaced by checking if "M_HASHTYPE_GET(m)" is different from
"M_HASHTYPE_NONE". In the future more hashtypes will be added, for
example hashtypes for hardware dedicated flows.

"M_HASHTYPE_OPAQUE" indicates that the "m_pkthdr.flowid" value is
valid and has no particular type. This change removes the need for an
"if" statement in TCP transmit code checking for the presence of a
valid flowid value. The "if" statement mentioned above is now a direct
variable assignment which is then later checked by the respective
network drivers like before.

r275483:
Remove M_FLOWID from SCTP code.

r276982:
Remove no longer used "M_FLOWID" flag from mbuf.h and update the netisr
manpage.

Note: The FreeBSD version has been bumped.

Reviewed by:    hps, tuexen
Sponsored by:   Limelight Networks
2015-04-24 23:26:44 +00:00
Enji Cooper
40364c8ebf MFC r279393:
Pad RX copy alignment calculation to avoid illegal memory accesses

The optimization made in r239940 is valid for struct mbuf's current structure
and size in FreeBSD, but hardcodes assumptions about sizes of struct mbuf,
which are unfortunately broken if additional data is added to the beginning of
struct mbuf

X-MFC note (discussed with rwatson):

This change requires the MPKTHSIZE definition, which is only available after
head@r277203 and will not be MFCed as it breaks mbuf(9) KPI.

A direct commit to stable/10 and merges to other branches to add the necessary
definitions to work with the code as-is will be done to facilitate this MFC

PR: 194314
Approved/Reviewed by: erj, jfv
Sponsored by: EMC / Isilon Storage Division
2015-04-24 22:18:50 +00:00