Eric Lee / smarc-fsl-linux-kernel

30 Jan, 2010

1 commit

  • 221af7f87   Split 'flush_old_exec' into two functions ... Browse Code »

    'flush_old_exec()' is the point of no return when doing an execve(), and
    it is pretty badly misnamed. It doesn't just flush the old executable
    environment, it also starts up the new one.

    Which is very inconvenient for things like setting up the new
    personality, because we want the new personality to affect the starting
    of the new environment, but at the same time we do _not_ want the new
    personality to take effect if flushing the old one fails.

    As a result, the x86-64 '32-bit' personality is actually done using this
    insane "I'm going to change the ABI, but I haven't done it yet" bit
    (TIF_ABI_PENDING), with SET_PERSONALITY() not actually setting the
    personality, but just the "pending" bit, so that "flush_thread()" can do
    the actual personality magic.

    This patch in no way changes any of that insanity, but it does split the
    'flush_old_exec()' function up into a preparatory part that can fail
    (still called flush_old_exec()), and a new part that will actually set
    up the new exec environment (setup_new_exec()). All callers are changed
    to trivially comply with the new world order.

    Signed-off-by: H. Peter Anvin
    Cc: stable@kernel.org
    Signed-off-by: Linus Torvalds

    Linus Torvalds
     

29 Jan, 2010

9 commits

28 Jan, 2010

10 commits

  • 010c108d7   MIPS: PowerTV: Fix support for timer interrupts with > 64 external IRQs ... Browse Code »

    The MIPS processor is limited to 64 external interrupt sources. Using a
    greater number without IRQ sharing requires reading platform-specific
    registers. On such platforms, reading the IntCtl register to determine
    which interrupt corresponds to a timer interrupt will not work.

    On MIPSR2 systems there is a solution - the TI bit in the Cause register,
    specifically indicates that a timer interrupt has occured. This patch uses
    that bit to detect interrupts for MIPSR2 processors, which may be expected
    to work regardless of how the timer interrupt may be routed in the hardware.

    Signed-off-by: David VomLehn (dvomlehn@cisco.com)
    To: linux-mips@linux-mips.org
    Patchwork: http://patchwork.linux-mips.org/patch/804/
    Signed-off-by: Ralf Baechle

    David VomLehn
     
  • 59dfa2fca   MIPS: PowerTV: Streamline access to platform device registers ... Browse Code »

    Pre-compute addresses for the basic ASIC registers. This speeds up access
    and allows memory for unused configurations to be freed. In addition,
    uninitialized register addresses will be returned as NULL to catch bad
    usage quickly.

    Signed-off-by: David VomLehn
    To: linux-mips@linux-mips.org
    Patchwork: http://patchwork.linux-mips.org/patch/806/
    Signed-off-by: Ralf Baechle

    David VomLehn
     
  • 9c4a6fce2   MIPS: Fix vmlinuz build for 32bit-only math shells ... Browse Code »

    POSIX requires $(()) arithmetic in sh only to have long
    arithmetic so on 32-bit sh binaries might do only 32-bit arithmetic but
    the arithmetic done in arch/mips/boot/compressed/Makefile needs 64-bit.

    I play with the AR7 platform, so VMLINUX_LOAD_ADDRESS is
    0xffffffff94100000, and for an example 4MiB kernel
    VMLINUZ_LOAD_ADDRESS is made out to be:
    ----
    alex@berk:~$ bash -c 'printf "%x\n" $((0xffffffff94100000 + 0x400000))'
    ffffffff94500000
    alex@berk:~$ dash -c 'printf "%x\n" $((0xffffffff94100000 + 0x400000))'
    80000000003fffff
    ----

    The former is obviously correct whilst the later breaks things royally.

    Fortunately working with only the lower 32bit's works for both bash and
    dash:
    ----
    $ bash -c 'printf "%x\n" $((0x94100000 + 0x400000))'
    94500000
    $ dash -c 'printf "%x\n" $((0x94100000 + 0x400000))'
    94500000
    ----

    So, we can split the original 64bit string to two parts, and only
    calculate the low 32bit part, which is big enough (1GiB kernel sizes
    anyone?) for a normal Linux kernel image file, now, we calculate the
    VMLINUZ_LOAD_ADDRESS like this:

    1. if present, append top 32bit of VMLINUX_LOAD_ADDRESS" as a prefix
    2. get the sum of the low 32bit of VMLINUX_LOAD_ADDRESS + VMLINUX_SIZE

    This patch fixes vmlinuz kernel builds on systems where only a
    32bit-only math shell is available.

    Patch Changelog:
    Version 2
    - simplified method by using 'expr' for 'substr' and making it work
    with dash once again
    Version 1
    - Revert the removals of '-n "$(VMLINUX_SIZE)"' to avoid the error
    of "make clean"
    - Consider more cases of the VMLINUX_LOAD_ADDRESS
    Version 0
    - initial release

    Signed-off-by: Alexander Clouter
    Acked-by: Wu Zhangjin
    Patchwork: http://patchwork.linux-mips.org/patch/861/
    Signed-off-by: Ralf Baechle

    Alexander Clouter
     
  • fe1d45e08   MIPS: Add support of LZO-compressed kernels ... Browse Code »

    The necessary changes to the x86 Kconfig and boot/compressed to allow the
    use of this new compression method.

    Signed-off-by: Wu Zhangjin
    Cc: linux-mips@linux-mips.org
    Cc: Sergei Shtylyov
    Patchwork: http://patchwork.linux-mips.org/patch/857/
    Signed-off-by: Ralf Baechle

    Wu Zhangjin
     
  • 00e4acb1e   Merge branch 'for-rmk' of git://git.marvell.com/orion Browse Code »
    Russell King
     
  • be8cde8b2   Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6 ... Browse Code »

    * git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6:
    [SCSI] aic79xx: check for non-NULL scb in ahd_handle_nonpkt_busfree
    [SCSI] zfcp: Set hardware timeout as requested by BSG request.
    [SCSI] zfcp: Introduce bsg_timeout callback.
    [SCSI] scsi_transport_fc: Allow LLD to reset FC BSG timeout
    [SCSI] zfcp: add missing compat ptr conversion
    [SCSI] zfcp: Fix linebreak in hba trace
    [SCSI] zfcp: Issue zfcp_fc_wka_port_put after FC CT BSG request
    [SCSI] qla2xxx: Update version number to 8.03.01-k10.
    [SCSI] fc-transport: Use packed modifier for fc_bsg_request structure.
    [SCSI] qla2xxx: Perform fast mailbox read of flash regardless of size nor address alignment.
    [SCSI] qla2xxx: Correct FCP2 recovery handling.
    [SCSI] scsi_lib: Fix bug in completion of bidi commands
    [SCSI] mptsas: Fix issue with chain pools allocation on katmai
    [SCSI] aacraid: fix File System going into read-only mode
    [SCSI] lpfc: fix file permissions

    Linus Torvalds
     
  • 981a2edd1   Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6 ... Browse Code »

    * 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
    [S390] fix single stepped svcs with TRACE_IRQFLAGS=y
    [S390] zcrypt: Do not remove coprocessor for error 8/72
    [S390] sclp_vt220: set initial terminal window size
    [S390] use set_current_state in sigsuspend
    [S390] irqflags: add missing types.h include
    [S390] dasd: fix possible NULL pointer errors

    Linus Torvalds
     
  • 4bdadb978   drm/i915: Selectively enable self-reclaim ... Browse Code »

    Having missed the ENOMEM return via i915_gem_fault(), there are probably
    other paths that I also missed. By not enabling NORETRY by default these
    paths can run the shrinker and take memory from the system (but not from
    our own inactive lists because our shrinker can not run whilst we hold
    the struct mutex) and this may allow the system to survive a little longer
    whilst our drivers consume all available memory.

    References:
    OOM killer unexpectedly called with kernel 2.6.32
    http://bugzilla.kernel.org/show_bug.cgi?id=14933

    v2: Pass gfp into page mapping.
    v3: Use new read_cache_page_gfp() instead of open-coding.

    Signed-off-by: Chris Wilson
    Cc: KOSAKI Motohiro
    Cc: Hugh Dickins
    Cc: Jesse Barnes
    Cc: Eric Anholt
    Cc: stable@kernel.org
    Signed-off-by: Linus Torvalds

    Chris Wilson
     
  • 7a4814367   firewire: ohci: fix crashes with TSB43AB23 on 64bit systems ... Browse Code »

    Unsurprisingly, Texas Instruments TSB43AB23 exhibits the same behaviour
    as TSB43AB22/A in dual buffer IR DMA mode: If descriptors are located
    at physical addresses above the 31 bit address range (2 GB), the
    controller will overwrite random memory. With luck, this merely
    prevents video reception. With only a little less luck, the machine
    crashes.

    We use the same workaround here as with TSB43AB22/A: Switch off the
    dual buffer capability flag and use packet-per-buffer IR DMA instead.
    Another possible workaround would be to limit the coherent DMA mask to
    31 bits.

    In Linux 2.6.33, this change serves effectively only as documentation
    since dual buffer mode is not used for any controller anymore. But
    somebody might want to re-enable it in the future to make use of
    features of dual buffer DMA that are not available in packet-per-buffer
    mode.

    In Linux 2.6.32 and older, this update is vital for anyone with this
    controller, more than 2 GB RAM, a 64 bit kernel, and FireWire video or
    audio applications.

    We have at least four reports:
    http://bugzilla.kernel.org/show_bug.cgi?id=13808
    http://marc.info/?l=linux1394-user&m=126154279004083
    https://bugzilla.redhat.com/show_bug.cgi?id=552142
    http://marc.info/?l=linux1394-user&m=126432246128386

    Reported-by: Paul Johnson
    Reported-by: Ronneil Camara
    Reported-by: G Zornetzer
    Reported-by: Mark Thompson
    Cc: stable@kernel.org
    Signed-off-by: Stefan Richter

    Stefan Richter
     
  • 0531b2aac   mm: add new 'read_cache_page_gfp()' helper function ... Browse Code »

    It's a simplified 'read_cache_page()' which takes a page allocation
    flag, so that different paths can control how aggressive the memory
    allocations are that populate a address space.

    In particular, the intel GPU object mapping code wants to be able to do
    a certain amount of own internal memory management by automatically
    shrinking the address space when memory starts getting tight. This
    allows it to dynamically use different memory allocation policies on a
    per-allocation basis, rather than depend on the (static) address space
    gfp policy.

    The actual new function is a one-liner, but re-organizing the helper
    functions to the point where you can do this with a single line of code
    is what most of the patch is all about.

    Tested-by: Chris Wilson
    Signed-off-by: Linus Torvalds

    Linus Torvalds
     

27 Jan, 2010

20 commits