Eric Lee / smarc-fsl-linux-kernel

30 Mar, 2010

1 commit

  • 5a0e3ad6a   include cleanup: Update gfp.h and slab.h includes to prepare for breaking implic… ... Browse Code »

    …it slab.h inclusion from percpu.h

    percpu.h is included by sched.h and module.h and thus ends up being
    included when building most .c files. percpu.h includes slab.h which
    in turn includes gfp.h making everything defined by the two files
    universally available and complicating inclusion dependencies.

    percpu.h -> slab.h dependency is about to be removed. Prepare for
    this change by updating users of gfp and slab facilities include those
    headers directly instead of assuming availability. As this conversion
    needs to touch large number of source files, the following script is
    used as the basis of conversion.

    http://userweb.kernel.org/~tj/misc/slabh-sweep.py

    The script does the followings.

    * Scan files for gfp and slab usages and update includes such that
    only the necessary includes are there. ie. if only gfp is used,
    gfp.h, if slab is used, slab.h.

    * When the script inserts a new include, it looks at the include
    blocks and try to put the new include such that its order conforms
    to its surrounding. It's put in the include block which contains
    core kernel includes, in the same order that the rest are ordered -
    alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
    doesn't seem to be any matching order.

    * If the script can't find a place to put a new include (mostly
    because the file doesn't have fitting include block), it prints out
    an error message indicating which .h file needs to be added to the
    file.

    The conversion was done in the following steps.

    1. The initial automatic conversion of all .c files updated slightly
    over 4000 files, deleting around 700 includes and adding ~480 gfp.h
    and ~3000 slab.h inclusions. The script emitted errors for ~400
    files.

    2. Each error was manually checked. Some didn't need the inclusion,
    some needed manual addition while adding it to implementation .h or
    embedding .c file was more appropriate for others. This step added
    inclusions to around 150 files.

    3. The script was run again and the output was compared to the edits
    from #2 to make sure no file was left behind.

    4. Several build tests were done and a couple of problems were fixed.
    e.g. lib/decompress_*.c used malloc/free() wrappers around slab
    APIs requiring slab.h to be added manually.

    5. The script was run on all .h files but without automatically
    editing them as sprinkling gfp.h and slab.h inclusions around .h
    files could easily lead to inclusion dependency hell. Most gfp.h
    inclusion directives were ignored as stuff from gfp.h was usually
    wildly available and often used in preprocessor macros. Each
    slab.h inclusion directive was examined and added manually as
    necessary.

    6. percpu.h was updated not to include slab.h.

    7. Build test were done on the following configurations and failures
    were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
    distributed build env didn't work with gcov compiles) and a few
    more options had to be turned off depending on archs to make things
    build (like ipr on powerpc/64 which failed due to missing writeq).

    * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
    * powerpc and powerpc64 SMP allmodconfig
    * sparc and sparc64 SMP allmodconfig
    * ia64 SMP allmodconfig
    * s390 SMP allmodconfig
    * alpha SMP allmodconfig
    * um on x86_64 SMP allmodconfig

    8. percpu.h modifications were reverted so that it could be applied as
    a separate patch and serve as bisection point.

    Given the fact that I had only a couple of failures from tests on step
    6, I'm fairly confident about the coverage of this conversion patch.
    If there is a breakage, it's likely to be something in one of the arch
    headers which should be easily discoverable easily on most builds of
    the specific arch.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>

    Tejun Heo
     

17 Dec, 2009

1 commit

09 Sep, 2009

1 commit

  • 09c8a5b85   ioat: switch watchdog and reset handler from workqueue to timer ... Browse Code »

    In order to support dynamic resizing of the descriptor ring or polling
    for a descriptor in the presence of a hung channel the reset handler
    needs to make progress while in a non-preemptible context. The current
    workqueue implementation precludes polling channel reset completion
    under spin_lock().

    This conversion also allows us to return to opportunistic cleanup in the
    ioat2 case as the timer implementation guarantees at least one cleanup
    after every descriptor is submitted. This means the worst case
    completion latency becomes the timer frequency (for exceptional
    circumstances), but with the benefit of avoiding busy waiting when the
    lock is contended.

    Signed-off-by: Maciej Sosnowski
    Signed-off-by: Dan Williams

    Dan Williams
     

29 Jul, 2009

1 commit

  • 584ec2275   ioat: move to drivers/dma/ioat/ ... Browse Code »

    When first created the ioat driver was the only inhabitant of
    drivers/dma/. Now, it is the only multi-file (more than a .c and a .h)
    driver in the directory. Moving it to an ioat/ subdirectory allows the
    naming convention to be cleaned up, and allows for future splitting of
    the source files by hardware version (v1, v2, and v3).

    Signed-off-by: Maciej Sosnowski
    Signed-off-by: Dan Williams

    Dan Williams
     

29 May, 2009

1 commit

  • 2f102607a   i7300_idle: allow testing on i5000-series hardware w/o re-compile ... Browse Code »

    Testing the i7300_idle driver on i5000-series hardware required
    an edit to i7300_idle.h to "#define SUPPORT_I5000 1" and a re-build
    of both i7300_idle and ioat_dma.

    Replace that build-time scheme with a load-time module parameter:
    "7300_idle.forceload=1" to make it easier to test the driver
    on hardware that while not officially validated, works fine
    and is much more commonly available.

    By default (no modparam) the driver will continue to load
    only on the i7300.

    Note that ioat_dma runs a copy of i7300_idle's probe routine
    to know to reserve an IOAT channel for i7300_idle.
    This change makes ioat_dma do that always on the i5000,
    just like it does on the i7300.

    Signed-off-by: Len Brown
    Acked-by: Andrew Henroid

    Len Brown
     

07 Apr, 2009

1 commit

07 Jan, 2009

1 commit

28 Oct, 2008

1 commit

25 Oct, 2008

2 commits

22 Oct, 2008

1 commit

  • 27471fdb3   i7300_idle driver v1.55 ... Browse Code »

    The Intel 7300 Memory Controller supports dynamic throttling of memory which can
    be used to save power when system is idle. This driver does the memory
    throttling when all CPUs are idle on such a system.

    Refer to "Intel 7300 Memory Controller Hub (MCH)" datasheet
    for the config space description.

    Signed-off-by: Andy Henroid
    Signed-off-by: Len Brown
    Signed-off-by: Venkatesh Pallipadi

    Andy Henroid