Eric Lee / smarc-fsl-linux-kernel

17 Dec, 2018

1 commit

  • 891e5a89f   lib/rbtree-test: lower default params ... Browse Code »

    commit 0b548e33e6cb2bff240fdaf1783783be15c29080 upstream.

    Fengguang reported soft lockups while running the rbtree and interval
    tree test modules. The logic for these tests all occur in init phase,
    and we currently are pounding with the default values for number of
    nodes and number of iterations of each test. Reduce the latter by two
    orders of magnitude. This does not influence the value of the tests in
    that one thousand times by default is enough to get the picture.

    Link: http://lkml.kernel.org/r/20171109161715.xai2dtwqw2frhkcm@linux-n805
    Signed-off-by: Davidlohr Bueso
    Reported-by: Fengguang Wu
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds
    Cc: Guenter Roeck
    Signed-off-by: Greg Kroah-Hartman

    Davidlohr Bueso
     

09 Sep, 2017

3 commits

24 Jan, 2014

2 commits

12 Sep, 2013

1 commit

01 May, 2013

2 commits

18 Dec, 2012

2 commits

  • 496f2f93b   random32: rename random32 to prandom ... Browse Code »

    This renames all random32 functions to have 'prandom_' prefix as follows:

    void prandom_seed(u32 seed); /* rename from srandom32() */
    u32 prandom_u32(void); /* rename from random32() */
    void prandom_seed_state(struct rnd_state *state, u64 seed);
    /* rename from prandom32_seed() */
    u32 prandom_u32_state(struct rnd_state *state);
    /* rename from prandom32() */

    The purpose of this renaming is to prevent some kernel developers from
    assuming that prandom32() and random32() might imply that only
    prandom32() was the one using a pseudo-random number generator by
    prandom32's "p", and the result may be a very embarassing security
    exposure. This concern was expressed by Theodore Ts'o.

    And furthermore, I'm going to introduce new functions for getting the
    requested number of pseudo-random bytes. If I continue to use both
    prandom32 and random32 prefixes for these functions, the confusion
    is getting worse.

    As a result of this renaming, "prandom_" is the common prefix for
    pseudo-random number library.

    Currently, srandom32() and random32() are preserved because it is
    difficult to rename too many users at once.

    Signed-off-by: Akinobu Mita
    Cc: "Theodore Ts'o"
    Cc: Robert Love
    Cc: Michel Lespinasse
    Cc: Valdis Kletnieks
    Cc: David Laight
    Cc: Adrian Hunter
    Cc: Artem Bityutskiy
    Cc: David Woodhouse
    Cc: Eilon Greenstein
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Akinobu Mita
     
  • 918854a65   lib/rbtree_test.c: fix uninitialized variable warning ... Browse Code »

    Fix this warning:

    lib/rbtree_test.c: In function `check':
    lib/rbtree_test.c:121: warning: `blacks' may be used uninitialized in this function

    Signed-off-by: Cong Ding
    Cc: Michel Lespinasse
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Cong Ding
     

09 Oct, 2012

6 commits

  • 9c079add0   rbtree: move augmented rbtree functionality to rbtree_augmented.h ... Browse Code »

    Provide rb_insert_augmented() and rb_erase_augmented() through a new
    rbtree_augmented.h include file. rb_erase_augmented() is defined there as
    an __always_inline function, in order to allow inlining of augmented
    rbtree callbacks into it. Since this generates a relatively large
    function, each augmented rbtree user should make sure to have a single
    call site.

    Signed-off-by: Michel Lespinasse
    Cc: Rik van Riel
    Cc: Hillf Danton
    Cc: Peter Zijlstra
    Cc: Catalin Marinas
    Cc: Andrea Arcangeli
    Cc: David Woodhouse
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Michel Lespinasse
     
  • 3908836aa   rbtree: add RB_DECLARE_CALLBACKS() macro ... Browse Code »

    As proposed by Peter Zijlstra, this makes it easier to define the augmented
    rbtree callbacks.

    Signed-off-by: Michel Lespinasse
    Cc: Rik van Riel
    Cc: Peter Zijlstra
    Cc: Andrea Arcangeli
    Cc: David Woodhouse
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Michel Lespinasse
     
  • 14b94af0b   rbtree: faster augmented rbtree manipulation ... Browse Code »

    Introduce new augmented rbtree APIs that allow minimal recalculation of
    augmented node information.

    A new callback is added to the rbtree insertion and erase rebalancing
    functions, to be called on each tree rotations. Such rotations preserve
    the subtree's root augmented value, but require recalculation of the one
    child that was previously located at the subtree root.

    In the insertion case, the handcoded search phase must be updated to
    maintain the augmented information on insertion, and then the rbtree
    coloring/rebalancing algorithms keep it up to date.

    In the erase case, things are more complicated since it is library
    code that manipulates the rbtree in order to remove internal nodes.
    This requires a couple additional callbacks to copy a subtree's
    augmented value when a new root is stitched in, and to recompute
    augmented values down the ancestry path when a node is removed from
    the tree.

    In order to preserve maximum speed for the non-augmented case,
    we provide two versions of each tree manipulation function.
    rb_insert_augmented() is the augmented equivalent of rb_insert_color(),
    and rb_erase_augmented() is the augmented equivalent of rb_erase().

    Signed-off-by: Michel Lespinasse
    Acked-by: Rik van Riel
    Cc: Peter Zijlstra
    Cc: Andrea Arcangeli
    Cc: David Woodhouse
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Michel Lespinasse
     
  • dadf93534   rbtree: augmented rbtree test ... Browse Code »

    Small test to measure the performance of augmented rbtrees.

    Signed-off-by: Michel Lespinasse
    Acked-by: Rik van Riel
    Cc: Peter Zijlstra
    Cc: Andrea Arcangeli
    Cc: David Woodhouse
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Michel Lespinasse
     
  • 28d753092   rbtree test: fix sparse warning about 64-bit constant ... Browse Code »

    Just a small fix to make sparse happy.

    Signed-off-by: Michel Lespinasse
    Reported-by: Fengguang Wu
    Acked-by: Rik van Riel
    Cc: Peter Zijlstra
    Cc: Andrea Arcangeli
    Cc: David Woodhouse
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Michel Lespinasse
     
  • 910a742d4   rbtree: performance and correctness test ... Browse Code »

    This small module helps measure the performance of rbtree insert and
    erase.

    Additionally, we run a few correctness tests to check that the rbtrees
    have all desired properties:

    - contains the right number of nodes in the order desired,
    - never two consecutive red nodes on any path,
    - all paths to leaf nodes have the same number of black nodes,
    - root node is black

    [akpm@linux-foundation.org: fix printk warning: sparc64 cycles_t is unsigned long]
    Signed-off-by: Michel Lespinasse
    Cc: Andrea Arcangeli
    Acked-by: David Woodhouse
    Cc: Rik van Riel
    Cc: Peter Zijlstra
    Cc: Daniel Santos
    Cc: Jens Axboe
    Cc: "Eric W. Biederman"
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Michel Lespinasse