Eric Lee / smarc-fsl-linux-kernel

03 Nov, 2011

2 commits

  • f567a1859   include/linux/sem.h: make sysv_sem empty if SYSVIPC is disabled ... Browse Code »

    For the sysvsem undo, each task struct contains a sysv_sem structure with
    a pointer to the undo information.

    This pointer is only necessary if sysvipc is enabled - thus the pointer
    can be made conditional on CONFIG_SYSVIPC.

    Signed-off-by: Manfred Spraul
    Acked-by: Peter Zijlstra
    Cc: Thomas Gleixner
    Cc: Mike Galbraith
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Manfred Spraul
     
  • e57940d71   ipc/sem.c: remove private structures from public header file ... Browse Code »

    include/linux/sem.h contains several structures that are only used within
    ipc/sem.c.

    The patch moves them into ipc/sem.c - there is no need to expose the
    structures to the whole kernel.

    No functional changes, only whitespace cleanups and 80-char per line
    fixes.

    Signed-off-by: Manfred Spraul
    Acked-by: Peter Zijlstra
    Cc: Thomas Gleixner
    Cc: Mike Galbraith
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Manfred Spraul
     

27 Jul, 2011

1 commit

  • 60063497a   atomic: use <linux/atomic.h> ... Browse Code »

    This allows us to move duplicated code in
    (atomic_inc_not_zero() for now) to

    Signed-off-by: Arun Sharma
    Reviewed-by: Eric Dumazet
    Cc: Ingo Molnar
    Cc: David Miller
    Cc: Eric Dumazet
    Acked-by: Mike Frysinger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arun Sharma
     

28 May, 2010

1 commit

  • 31a7c4746   ipc/sem.c: cacheline align the ipc spinlock for semaphores ... Browse Code »

    Cacheline align the spinlock for sysv semaphores. Without the patch, the
    spinlock and sem_otime [written by every semop that modified the array]
    and sem_base [read in the hot path of try_atomic_semop()] can be in the
    same cacheline.

    Signed-off-by: Manfred Spraul
    Cc: Chris Mason
    Cc: Zach Brown
    Cc: Jens Axboe
    Cc: Nick Piggin
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Manfred Spraul
     

16 Dec, 2009

1 commit

  • b97e820ff   ipc/sem.c: add a per-semaphore pending list ... Browse Code »

    Based on Nick's findings:

    sysv sem has the concept of semaphore arrays that consist out of multiple
    semaphores. Atomic operations that affect multiple semaphores are
    supported.

    The patch is the first step for optimizing simple, single semaphore
    operations: In addition to the global list of all pending operations, a
    2nd, per-semaphore list with the simple operations is added.

    Note: this patch does not make sense by itself, the new list is used
    nowhere.

    Signed-off-by: Manfred Spraul
    Cc: Nick Piggin
    Cc: Pierre Peiffer
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Manfred Spraul
     

26 Jul, 2008

4 commits

  • 380af1b33   ipc/sem.c: rewrite undo list locking ... Browse Code »

    The attached patch:
    - reverses the locking order of ulp->lock and sem_lock:
    Previously, it was first ulp->lock, then inside sem_lock.
    Now it's the other way around.
    - converts the undo structure to rcu.

    Benefits:
    - With the old locking order, IPC_RMID could not kfree the undo structures.
    The stale entries remained in the linked lists and were released later.
    - The patch fixes a a race in semtimedop(): if both IPC_RMID and a semget() that
    recreates exactly the same id happen between find_alloc_undo() and sem_lock,
    then semtimedop() would access already kfree'd memory.

    [akpm@linux-foundation.org: coding-style fixes]
    Signed-off-by: Manfred Spraul
    Reviewed-by: Nadia Derbey
    Cc: Pierre Peiffer
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Manfred Spraul
     
  • a1193f8ec   ipc/sem.c: convert sem_array.sem_pending to struct list_head ... Browse Code »

    sem_array.sem_pending is a double linked list, the attached patch converts
    it to struct list_head.

    [akpm@linux-foundation.org: coding-style fixes]
    Signed-off-by: Manfred Spraul
    Reviewed-by: Nadia Derbey
    Cc: Pierre Peiffer
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Manfred Spraul
     
  • 2c0c29d41   ipc/sem.c: remove unused entries from struct sem_queue ... Browse Code »

    sem_queue.sma and sem_queue.id were never used, the attached patch removes
    them.

    Signed-off-by: Manfred Spraul
    Reviewed-by: Nadia Derbey
    Cc: Pierre Peiffer
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Manfred Spraul
     
  • 4daa28f6d   ipc/sem.c: convert undo structures to struct list_head ... Browse Code »

    The undo structures contain two linked lists, the attached patch replaces
    them with generic struct list_head lists.

    [akpm@linux-foundation.org: coding-style fixes]
    Signed-off-by: Manfred Spraul
    Cc: Nadia Derbey
    Cc: Pierre Peiffer
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Manfred Spraul
     

20 Oct, 2007

1 commit

  • 7ca7e564e   ipc: store ipcs into IDRs ... Browse Code »

    This patch introduces ipcs storage into IDRs. The main changes are:
    . This ipc_ids structure is changed: the entries array is changed into a
    root idr structure.
    . The grow_ary() routine is removed: it is not needed anymore when adding
    an ipc structure, since we are now using the IDR facility.
    . The ipc_rmid() routine interface is changed:
    . there is no need for this routine to return the pointer passed in as
    argument: it is now declared as a void
    . since the id is now part of the kern_ipc_perm structure, no need to
    have it as an argument to the routine

    Signed-off-by: Nadia Derbey
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nadia Derbey
     

25 Apr, 2006

1 commit

07 Nov, 2005

1 commit

  • 8c65b4a60   [PATCH] fix remaining missing includes ... Browse Code »

    Fix more include file problems that surfaced since I submitted the previous
    fix-missing-includes.patch. This should now allow not to include sched.h
    from module.h, which is done by a followup patch.

    Signed-off-by: Tim Schmielau
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Tim Schmielau
     

08 Sep, 2005

1 commit

17 Apr, 2005

1 commit

  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »

    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.

    Let it rip!

    Linus Torvalds