Impact: reduce kernel BSS size by 7 pages, improve code readability

Two page tables are used in current x86_64 kexec implementation. One
is used to jump from kernel virtual address to identity map address,
the other is used to map all physical memory. In fact, on x86_64,
there is no conflict between kernel virtual address space and physical
memory space, so just one page table is sufficient. The page table
pages used to map control page are dynamically allocated to save
memory if kexec image is not loaded. ASM code used to map control page
is replaced by C code too.
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Impact: make nmi_shootdown_cpus() callable from preemptible context

We need to know on which CPU we are running on, and we don't want to be
preempted while doing this.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Impact: widen nmi_shootdown_cpus() availability

The X86_LOCAL_APIC #ifdef was for kdump. For !SMP, the function simply
does nothing.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Impact: make nmi_shootdown_cpus() available to the rest of the x86 platform

Now nmi_shootdown_cpus() is ready to be used by non-kdump code also.
Move it to reboot.c.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Impact: make API available to the rest of x86 platform code

Add prototype to asm/reboot.h.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Impact: extend nmi_shootdown_cpus() with a callback

The reboot code will use a different function on crash_nmi_callback().
Adding a function pointer parameter to nmi_shootdown_cpus() for that.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Impact: cleanup

For the kdump-specific code that was living on nmi_shootdown_cpus().
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Impact: cleanup

This variable will be moved to non-kdump-specific code.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Impact: cleanup

The NMI CPU-halting code will be used on non-kdump cases, also
(e.g. emergency_reboot when virtualization is enabled).
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  timers: handle HRTIMER_CB_IRQSAFE_UNLOCKED correctly from softirq context
  nohz: disable tick_nohz_kick_tick() for now
  irq: call __irq_enter() before calling the tick_idle_check
  x86: HPET: enter hpet_interrupt_handler with interrupts disabled
  x86: HPET: read from HPET_Tn_CMP() not HPET_T0_CMP
  x86: HPET: convert WARN_ON to WARN_ON_ONCE

Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  sched: release buddies on yield
  fix for account_group_exec_runtime(), make sure ->signal can't be freed under rq->lock
  sched: clean up debug info

Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  ring-buffer: prevent infinite looping on time stamping
  ftrace: disable tracing on resize
  ftrace: fix breakage in bin_fmt results
  ftrace: ftrace.txt version update
  ftrace: update txt document

* 'for-linus' of git://oss.sgi.com/xfs/xfs:
  [XFS] XFS: Check for valid transaction headers in recovery
  [XFS] handle memory allocation failures during log initialisation
  [XFS] Account for allocated blocks when expanding directories
  [XFS] Wait for all I/O on truncate to zero file size
  [XFS] Fix use-after-free with log and quotas

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2: (21 commits)
  ocfs2: Check search result in ocfs2_xattr_block_get()
  ocfs2: fix printk related build warnings in xattr.c
  ocfs2: truncate outstanding block after direct io failure
  ocfs2/xattr: Proper hash collision handle in bucket division
  ocfs2: return 0 in page_mkwrite to let VFS retry.
  ocfs2: Set journal descriptor to NULL after journal shutdown
  ocfs2: Fix check of return value of ocfs2_start_trans() in xattr.c.
  ocfs2: Let inode be really deleted when ocfs2_mknod_locked() fails
  ocfs2: Fix checking of return value of new_inode()
  ocfs2: Fix check of return value of ocfs2_start_trans()
  ocfs2: Fix some typos in xattr annotations.
  ocfs2: Remove unused ocfs2_restore_xattr_block().
  ocfs2: Don't repeat ocfs2_xattr_block_find()
  ocfs2: Specify appropriate journal access for new xattr buckets.
  ocfs2: Check errors from ocfs2_xattr_update_xattr_search()
  ocfs2: Don't return -EFAULT from a corrupt xattr entry.
  ocfs2: Check xattr block signatures properly.
  ocfs2: add handler_map array bounds checking
  ocfs2: remove duplicate definition in xattr
  ocfs2: fix function declaration and definition in xattr
  ...

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6: (35 commits)
  V4L/DVB (9516): cx18: Move DVB buffer transfer handling from irq handler to work_queue
  V4L/DVB (9557): gspca: Small changes for the sensor HV7131B in zc3xx.
  V4L/DVB (9556): gspca: Bad init sequence for sensor HV7131B in zc3xx.
  V4L/DVB (9549): gspca: Fix a typo in one of gspca chips name.
  V4L/DVB (9515): cx18: Use correct Mailbox IRQ Ack values and misc IRQ handling cleanup
  V4L/DVB (9493): kconfig patch
  V4L/DVB (9527): af9015: fix compile warnings
  V4L/DVB (9524): af9013: fix bug in status reading
  V4L/DVB (9511): cx18: Mark CX18_CPU_DE_RELEASE_MDL as a slow API call
  V4L/DVB (9510): cx18: Fix write retries for registers that always change - part 2.
  V4L/DVB (9506): ivtv/cx18: fix test whether modules should be loaded or not.
  V4L/DVB (9499): cx88-mpeg: final fix for analogue only compilation + de-alloc fix
  V4L/DVB (9496): cx88-blackbird: bugfix: cx88-blackbird-mpeg-users
  V4L/DVB (9495): cx88-blackbird: bugfix: cx88-blackbird-poll-fix
  V4L/DVB (9494): anysee: initialize anysee_usb_mutex statically
  V4L/DVB (9492): unplug oops from dvb_frontend_init...
  V4L/DVB (9486): ivtv/ivtvfb: no longer experimental
  V4L/DVB (9485): ivtv: remove incorrect V4L1 & tvaudio dependency
  V4L/DVB (9482): Documentation, especially regarding audio and informational links
  V4L/DVB (9475): cx18: Disable write retries for registers that always change - part 1.
  ...

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc:
  powerpc: Update desktop/server defconfigs
  powerpc: Fix msr check in compat_sys_swapcontext
  powerpc: Repair device bindings documentation
  powerpc: Updated Freescale PPC related defconfigs
  powerpc: Update QE/CPM2 usb_ctlr structures for USB support
  powerpc/86xx: Correct SOC bus-frequency in GE Fanuc SBC610 DTS
  powerpc: Fix Book-E watchdog timer interval setting
  powerpc/fsl-booke: Fix synchronization bug w/local tlb invalidates

* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
  drm/i915: Move legacy breadcrumb out of the reserved status page area
  drm/i915: Filter pci devices based on PCI_CLASS_DISPLAY_VGA
  drm/radeon: map registers at load time
  drm: Remove infrastructure for supporting i915's vblank swapping.
  i915: Remove racy delayed vblank swap ioctl.
  i915: Don't whine when pci_enable_msi() fails.
  i915: Don't attempt to short-circuit object_wait_rendering by checking domains.
  i915: Clean up sarea pointers on leavevt
  i915: Save/restore MCHBAR_RENDER_STANDBY on GM965/GM45

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  libata: fix last_reset timestamp handling
  libata: Avoid overflow in ata_tf_read_block() when tf->hba_lbal > 127
  [libata] pata_pcmcia: another memory card support
  [libata] pata_sch: notice attached slave devices
  [libata] pata_cs553*.c: cleanup kernel-doc

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  sparc64: Update defconfig.
  Revert "sparc: correct section of current_pc()"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6:
  dsa: fix master interface allmulti/promisc handling
  dsa: fix skb->pkt_type when mac address of slave interface differs
  net: fix setting of skb->tail in skb_recycle_check()
  net: fix /proc/net/snmp as memory corruptor
  mac80211: fix a buffer overrun in station debug code
  netfilter: payload_len is be16, add size of struct rather than size of pointer
  ipv6: fix ip6_mr_init error path
  [4/4] dca: fixup initialization dependency
  [3/4] I/OAT: fix async_tx.callback checking
  [2/4] I/OAT: fix dma_pin_iovec_pages() error handling
  [1/4] I/OAT: fix channel resources free for not allocated channels
  ssb: Fix DMA-API compilation for non-PCI systems
  SSB: hide empty sub menu
  vlan: Fix typos in proc output string
  [netdrvr] usb/hso: Cleanup rfkill error handling
  sfc: Correct address of gPXE boot configuration in EEPROM
  el3_common_init() should be __devinit, not __init
  hso: rfkill type should be WWAN
  mlx4_en: Start port error flow bug fix
  af_key: mark policy as dead before destroying

Clear buddies on yield, so that the buddy rules don't schedule them
despite them being placed right-most.

This fixed a performance regression with yield-happy binary JVMs.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Tested-by: Lin Ming <ming.m.lin@intel.com>

cx18: Move DVB buffer transfer handling from irq handler to work_queue thread.
In order to properly lock the epu2cpu mailbox for driver to CX23418 commands,
the DVB/TS buffer handling needs to be moved from the IRQ handler and IRQ
context to a work queue.  This work_queue implmentation is strikingly similar
to the ivtv implementation - for better or worse.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

- touch only one register for brightness change
- no quality control
- don't probe again at streamon time.
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

This patch fixes the H flip and the R & B color inversion of mode 320x240.
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

cx18: Use correct Mailbox IRQ Ack values and misc IRQ handling cleanup.
The SCB field definitions for Ack IRQ's for mailboxes were inconsistent with
the bitmasks being loaded into those SCB fields and the SW2 Ack IRQ handling
logic.  Renamed fields in SCB to make things consistent and did misc IRQ
handling cleanups: removing legacy ivtv dma_reg_lock, HPU IRQ flags, etc.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Ok I made a patch that converts gspca kconfig file to a more standard=
one, with tabs + 2 white spaces, so that if a warning is added it still
compiles
please find it attached
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

- use static to avoid compile warnings
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

- ! has a higher precedence than &
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

cx18: Mark CX18_CPU_DE_RELEASE_MDL as a slow API call.
Give the encoder time to complete the MDL release before destroying the
encoder internal task.  This avoids an encoder lockup on the next digital
capture and error messages about buffers being returned for an inactive
encoder task handle.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

cx18: Fix write retries for registers that always change - part 2.
Some registers, especially interrupt related ones, will never read
back the value just written.  Modified interrupt register readback
checks to make sure the intended effect was achieved.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Final fix for when analogue only is selected
for compilation (ie, !CX88_DVB)

This tidies up previous fix and adds missing
de-alloc memory leak on fault (eg, if fe1 fails to alloc
where fe0 was allocated).
Signed-off-by: Darron Broad <darron@kewl.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Allows multiple access to the mpeg device
Signed-off-by: Frederic CAND <frederic.cand@anevia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Starts encoder not only on a read call but also on a poll command.
Signed-off-by: Frederic CAND <frederic.cand@anevia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

anysee_usb_mutex is initialized at every time the anysee device is probed.
If the second anysee device is probed while anysee_usb_mutex is locked by
the first anysee device, the mutex is broken.

This patch fixes by initialize anysee_usb_mutex statically rather
than initialize at probe time.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

When inadvertently hot-unplugging a WT-220U USB DVB-T receiver with
2.6.24, I was met with an oops [1]. The problem is relevant to
2.6.25/26-rc also.

dvb_frontend_init() was called either from re-creation of the kdvb-fe0
thread - seems unlikely, or someone called
dvb_frontend_reinitialise(), causing this path in the thread - really
unlikely, as I can't find any call-site for it.

Either way, quite a number of drivers call dvb_usb_generic_rw() [2]
without checking the validity of the relevant member in the
dvb_usb_device struct - which had changed. Having dvb_usb_generic_rw()
sanity-check and fail (rather than loading from 0x120) seems
reasonable defensive programming [3], in light of it being called in
this way.

The problem with this, is that drivers don't check the return code of
the init call [4]. Does it make sense to cook a patch which allows the
failure to be propagated back up, or am I missing something else?

Thanks,
  Daniel

<whoops, hot unplug>

[83711.538485] dvb-usb: bulk message failed: -71 (1/0)
[83711.538875] dvb-usb: bulk message failed: -71 (1/0)
[83711.538899] usb 7-5: USB disconnect, address 3
[83711.538905] dvb-usb: bulk message failed: -22 (1/0)
[83711.538924] dvb-usb: bulk message failed: -22 (1/0)
[83711.538943] dvb-usb: bulk message failed: -22 (1/0)
[83711.588979] dvb-usb: bulk message failed: -22 (1/0)
[83711.589031] dvb-usb: bulk message failed: -22 (1/0)
[83711.589078] dvb-usb: bulk message failed: -22 (1/0)
[83711.589122] dvb-usb: bulk message failed: -22 (1/0)
[83711.589167] dvb-usb: bulk message failed: -22 (1/0)
[83711.639233] dvb-usb: bulk message failed: -22 (1/0)
[83711.639282] dvb-usb: bulk message failed: -22 (1/0)
[83711.639330] dvb-usb: bulk message failed: -22 (1/0)
[83711.639374] dvb-usb: bulk message failed: -22 (1/0)
[83711.639421] dvb-usb: bulk message failed: -22 (1/0)
[83711.658391] dvb-usb: bulk message failed: -22 (1/0)
[83768.174281] dvb-usb: bulk message failed: -22 (2/-32512)
[83768.174350] Unable to handle kernel NULL pointer
dereference<6>dvb-usb: WideView WT-220U PenType Receiver
(Typhoon/Freecom) successfully deinitialized and disconnected.
[83768.174459]  at 0000000000000120 RIP:
[83768.174459]  [<ffffffff88339b4f>] :dvb_usb:dvb_usb_generic_rw+0x2f/0x1a0
[83768.174580] PGD 0
[83768.174643] Oops: 0000 [1] SMP
[83768.174723] CPU 0
[83768.174782] Modules linked in: nfsd auth_rpcgss exportfs nfs lockd
nfs_acl sunrpc af_packet xt_length ipt_tos ipt_TOS xt_CLASSIFY sch_sfq
sch_htb ipt_MASQUERADE ipt_REDIRECT xt_limit xt_state xt_tcpudp
iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack iptable_mangle
iptable_filter ip_tables x_tables xfs sbp2 parport_pc lp parport loop
ftdi_sio usbserial evdev dvb_usb_dtt200u dvb_usb dvb_core i2c_core
sky2 iTCO_wdt iTCO_vendor_support snd_hda_intel shpchp snd_pcm
snd_timer snd_page_alloc snd_hwdep snd pci_hotplug soundcore ipv6
button intel_agp ext3 jbd mbcache sg sd_mod ata_generic pata_acpi ahci
ata_piix libata scsi_mod ohci1394 ieee1394 ehci_hcd uhci_hcd usbcore
e1000 thermal processor fan fbcon tileblit font bitblit softcursor
fuse
[83768.176968] Pid: 5732, comm: kdvb-fe-0 Not tainted 2.6.24-16-server #1
[83768.177009] RIP: 0010:[<ffffffff88339b4f>]  [<ffffffff88339b4f>]
:dvb_usb:dvb_usb_generic_rw+0x2f/0x1a0
[83768.177096] RSP: 0018:ffff810021939df0  EFLAGS: 00010286
[83768.177138] RAX: ffff81003bc7cc00 RBX: 0000000000000001 RCX: 0000000000000000
[83768.177181] RDX: 0000000000000001 RSI: ffff810021939e67 RDI: 0000000000000000
[83768.177223] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[83768.177267] R10: ffff810001009880 R11: 0000000000000001 R12: ffff81003c10b400
[83768.177311] R13: ffff81003c10b5b0 R14: ffff810021939ec0 R15: 0000000000000000
[83768.177354] FS:  0000000000000000(0000) GS:ffffffff805c3000(0000)
knlGS:0000000000000000
[83768.177409] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[83768.177449] CR2: 0000000000000120 CR3: 0000000000201000 CR4: 00000000000006e0
[83768.177491] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[83768.177534] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[83768.177576] Process kdvb-fe-0 (pid: 5732, threadinfo
ffff810021938000, task ffff81003bd1b7a0)
[83768.177629] Stack:  ffff81003e9b6828 0000000000000000
ffff8100378369f8 0000000000000000
[83768.177800]  ffff81003bd1b7a0 ffff810037836d48 ffff81003bc7cc30
ffff81003c10b400
[83768.177943]  ffff81003c10b5b0 ffff810021939ec0 ffff81003c10b5e0
ffffffff88342452
[83768.178054] Call Trace:
[83768.178130]  [<ffffffff88342452>] :dvb_usb_dtt200u:dtt200u_fe_init+0x22/0x30
[83768.178178]  [<ffffffff88339f6a>] :dvb_usb:dvb_usb_fe_wakeup+0x3a/0x50
[83768.178229]  [<ffffffff88325c41>] :dvb_core:dvb_frontend_init+0x21/0x70
[83768.178278]  [<ffffffff8832746b>] :dvb_core:dvb_frontend_thread+0x8b/0x370
[83768.178329]  [<ffffffff883273e0>] :dvb_core:dvb_frontend_thread+0x0/0x370
[83768.178382]  [<ffffffff80253e3b>] kthread+0x4b/0x80
[83768.178427]  [<ffffffff8020d198>] child_rip+0xa/0x12
[83768.178473]  [<ffffffff80253df0>] kthread+0x0/0x80
[83768.178514]  [<ffffffff8020d18e>] child_rip+0x0/0x12
[83768.178557]
[83768.178594]
[83768.178594] Code: 44 8b 87 20 01 00 00 49 89 f4 45 89 ce 45 85 c0
0f 84 ad 00
[83768.179167] RIP  [<ffffffff88339b4f>] :dvb_usb:dvb_usb_generic_rw+0x2f/0x1a0
[83768.179234]  RSP <ffff810021939df0>
[83768.179271] CR2: 0000000000000120
[83768.179419] ---[ end trace dba8483163cb1700 ]---
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>