Jeff Chua bisected down a vmware guest boot breakage (hang) to
this paravirt change:

  commit 8d947344
  Author: Glauber de Oliveira Costa <gcosta@redhat.com>
  Date:   Wed Jan 30 13:31:12 2008 +0100

    x86: change write_idt_entry signature

fix the off-by-one indexing bug ...
Bisected-by: NJeff Chua <jeff.chua.linux@gmail.com>
Tested-by: NJeff Chua <jeff.chua.linux@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Kevin Winchester reported the loss of direct rendering, due to:

[    0.588184] agpgart: Detected AGP bridge 0
[    0.588184] agpgart: unable to get memory for graphics translation table.
[    0.588184] agpgart: agp_backend_initialize() failed.
[    0.588207] agpgart-amd64: probe of 0000:00:00.0 failed with error -12

and bisected it down to:

  commit 266b9f87
  Author: Thomas Gleixner <tglx@linutronix.de>
  Date:   Wed Jan 30 13:34:06 2008 +0100

      x86: fix ioremap RAM check

this check was too strict and caused an ioremap() failure.

the problem is due to the somewhat unclean way of how the GART code
reserves a memory range for its aperture, and how it utilizes it
later on.

Allow RAM pages to be ioremap()-ed too, as long as they are reserved.
Bisected-by: NKevin Winchester <kjwinchester@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Tested-by: NKevin Winchester <kjwinchester@gmail.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

* git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6: (95 commits)
  ide-tape: remove idetape_config_t typedef
  ide-tape: remove mtio.h related comments
  ide-tape: make function name more accurate
  ide-tape: remove unused sense packet commands.
  ide-tape: use generic byteorder macros
  ide-tape: remove EXPERIMENTAL driver status
  ide-tape: use generic scsi commands
  ide-tape: remove struct idetape_block_size_page_t
  ide-tape: remove structs os_partition_t, os_dat_entry_t, os_dat_t
  ide-tape: remove struct idetape_parameter_block_descriptor_t
  ide-tape: remove struct idetape_medium_partition_page_t
  ide-tape: remove struct idetape_data_compression_page_t
  ide-tape: remove struct idetape_inquiry_result_t
  ide-tape: remove struct idetape_capabilities_page_t
  ide-tape: remove IDETAPE_DEBUG_BUGS
  ide-tape: remove IDETAPE_DEBUG_INFO
  ide-tape: dump gcw fields on error in idetape_identify_device()
  ide-tape: remove struct idetape_mode_parameter_header_t
  ide-tape: remove struct idetape_request_sense_result_t
  ide-tape: remove dead code
  ...

Frederik Himpe reported an unkillable and un-straceable pan process.

Zero length iovecs can go into an infinite loop in writev, because the
iovec iterator does not always advance over them.

The sequence required to trigger this is not trivial. I think it
requires that a zero-length iovec be followed by a non-zero-length iovec
which causes a pagefault in the atomic usercopy. This causes the writev
code to drop back into single-segment copy mode, which then tries to
copy the 0 bytes of the zero-length iovec; a zero length copy looks like
a failure though, so it loops.

Put a test into iov_iter_advance to catch zero-length iovecs. We could
just put the test in the fallback path, but I feel it is more robust to
skip over zero-length iovecs throughout the code (iovec iterator may be
used in filesystems too, so it should be robust).
Signed-off-by: NNick Piggin <npiggin@suse.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
  ieee1394: sbp2: fix bogus s/g access change

Since this is used only in idetape_blkdev_ioctl(), remove the typedef and make
the struct function-local.

Bart:
- s/sizeof(struct idetape_config)/sizeof(config)/
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Those are already in mtio.h.

Bart:
- undo 'unsigned int/unsigned long' -> 'uint/ulong' conversion
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

idetape_active_next_stage() was rather ambiguous wrt its purpose. Make that
more explicit and remove superfluous comment.
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

This is not a network driver.
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

ide-tape has depended on EXPERIMENTAL for ages. Change that since the driver is
being only maintained now.
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Also, remove those which weren't used.
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

They seem just to sit there completely unused.
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Also, shorten function name idetape_get_blocksize_from_block_descriptor() and
move its definition up thereby getting rid of its forward declaration.
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

There should be no functional changes resulting from this patch.
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

There should be no functional changes resulting from this patch.
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

There should be no functional changes resulting from this patch.
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

All those 2-byte values denoting the different capabilities are being written to
the local copy of the caps buffer without being converted to big endian for
simplicity of usage and shorter code later.  Also, we add some comments stating
which are the fields of the caps page in question in order to alleviate the
cryptic pointer casting exercises as in e.g. idetape_get_mode_sense_results().

There should be no functional changes resulting from this patch.

Bart:
- remove two needless "!!"
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

The device capabilities are probed for during device initialization so this
info is available through proc/ioctl() und it is redundant here.
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Cc: Borislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Bart:
- remove 'capabilities->speed' chunk
- re-add brackets to block_descrp assignment
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Bart:
- remove unnecessary comment change
- remove two needless "!!"
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Also, cleanup whitespace and update comments.

Bart:
- remove reference to drivers/block/ide.c
- move driver documentation to Documentation/ide/ide-tape.txt
Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

No reason to use ide_init_hwif_ports() in ide-cs (as a nice side-effect
this makes ide-cs work on archs that don't define IDE_ARCH_OBSOLETE_INIT).
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

* Move check_dma_crc() to ide-dma.c and add inline version for
  CONFIG_BLK_DEV_IDEDMA=n case.

* Rename check_dma_crc() to ide_check_dma_crc().
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

While at it:

* Remove needless '!drive->crc_count' check.
Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

SELECT_DRIVE() is called by IDE core code in start_request() before device
driver's ->do_request method.  In ide-scsi case ->do_request is implemented
by idescsi_do_request() which is also the only user of idescsi_issue_pc().
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

* Use __ide_set_handler() in ide_execute_command().

While at it:

* Fix whitespace damage in ide_execute_command().
Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

* siimage.c: use hwif->sata_scr[SATA_{ERROR,STATUS}_OFFSET] instead of
  SATA_{ERROR,STATUS}_REG macros.

* Remove no longer needed SATA_*_REG macros.

While at it:

* Remove needless SATA Status register read from sil_sata_reset_poll().
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

* ->nice0 and ->nice2 ide_drive_t fields are always zero so remove them.

* IDE_NICE_0 and IDE_NICE_2 defines from <linux/hdreg.h> are no longer
  used by any kernel code so cover them with #ifndef/#endif __KERNEL__.
Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

* Cache value read from the Status register in 'stat' variable in do_probe()
  and enable_nest(), then remove remove needless Status register reads.

While at it:

* Add proper KERN_* levels to printk() calls.
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>