Eric Lee / smarc-fsl-linux-kernel

26 Mar, 2006

1 commit

  • f348d70a3   [PATCH] POLLRDHUP/EPOLLRDHUP handling for half-closed devices notifications ... Browse Code »

    Implement the half-closed devices notifiation, by adding a new POLLRDHUP
    (and its alias EPOLLRDHUP) bit to the existing poll/select sets. Since the
    existing POLLHUP handling, that does not report correctly half-closed
    devices, was feared to be changed, this implementation leaves the current
    POLLHUP reporting unchanged and simply add a new bit that is set in the few
    places where it makes sense. The same thing was discussed and conceptually
    agreed quite some time ago:

    http://lkml.org/lkml/2003/7/12/116

    Since this new event bit is added to the existing Linux poll infrastruture,
    even the existing poll/select system calls will be able to use it. As far
    as the existing POLLHUP handling, the patch leaves it as is. The
    pollrdhup-2.6.16.rc5-0.10.diff defines the POLLRDHUP for all the existing
    archs and sets the bit in the six relevant files. The other attached diff
    is the simple change required to sys/epoll.h to add the EPOLLRDHUP
    definition.

    There is "a stupid program" to test POLLRDHUP delivery here:

    http://www.xmailserver.org/pollrdhup-test.c

    It tests poll(2), but since the delivery is same epoll(2) will work equally.

    Signed-off-by: Davide Libenzi
    Cc: "David S. Miller"
    Cc: Michael Kerrisk
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Davide Libenzi
     

24 Mar, 2006

1 commit

  • ab7efcc97   [PATCH] abstract type/size specification for assembly ... Browse Code »

    Provide abstraction for generating type and size information of assembly
    routines and data, while permitting architectures to override these
    defaults.

    Signed-off-by: Jan Beulich
    Cc: "Russell King"
    Cc: Ralf Baechle
    Cc: "Andi Kleen"
    Cc: "Luck, Tony"
    Cc: Miles Bader
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jan Beulich
     

16 Feb, 2006

1 commit

  • 5f6164f30   [PATCH] add asm-generic/mman.h ... Browse Code »

    Make new MADV_REMOVE, MADV_DONTFORK, MADV_DOFORK consistent across all
    arches. The idea is to make it possible to use them portably even before
    distros include them in libc headers.

    Move common flags to asm-generic/mman.h

    Signed-off-by: Michael S. Tsirkin
    Cc: Roland Dreier
    Cc: Badari Pulavarty
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Michael S. Tsirkin
     

15 Feb, 2006

1 commit

  • f82256616   [PATCH] madvise MADV_DONTFORK/MADV_DOFORK ... Browse Code »

    Currently, copy-on-write may change the physical address of a page even if the
    user requested that the page is pinned in memory (either by mlock or by
    get_user_pages). This happens if the process forks meanwhile, and the parent
    writes to that page. As a result, the page is orphaned: in case of
    get_user_pages, the application will never see any data hardware DMA's into
    this page after the COW. In case of mlock'd memory, the parent is not getting
    the realtime/security benefits of mlock.

    In particular, this affects the Infiniband modules which do DMA from and into
    user pages all the time.

    This patch adds madvise options to control whether memory range is inherited
    across fork. Useful e.g. for when hardware is doing DMA from/into these
    pages. Could also be useful to an application wanting to speed up its forks
    by cutting large areas out of consideration.

    Signed-off-by: Michael S. Tsirkin
    Acked-by: Hugh Dickins
    Cc: Michael Kerrisk
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Michael S. Tsirkin
     

04 Feb, 2006

1 commit

  • bcc68b861   [PATCH] include/asm-*/bitops.h: fix more "~0UL >> size" typos ... Browse Code »

    "[PATCH] m68knommu: fix find_next_zero_bit in bitops.h" fixed a typo in
    m68knommu implementation of find_next_zero_bit().

    grep(1) shows that cris, frv, h8300, v850 are also affected.

    Signed-off-by: Alexey Dobriyan
    Cc: Mikael Starvik
    Cc: David Howells
    Cc: Yoshinori Sato
    Cc: Miles Bader
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Alexey Dobriyan
     

15 Jan, 2006

1 commit

13 Jan, 2006

2 commits

11 Jan, 2006

1 commit

10 Jan, 2006

2 commits

09 Jan, 2006

3 commits

  • a13656470   [PATCH] remove gcc-2 checks ... Browse Code »

    Remove various things which were checking for gcc-1.x and gcc-2.x compilers.

    From: Adrian Bunk

    Some documentation updates and removes some code paths for gcc < 3.2.

    Acked-by: Russell King
    Signed-off-by: Adrian Bunk
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Andrew Morton
     
  • f8aaeacec   [PATCH] consolidate asm/futex.h ... Browse Code »

    Most of the architectures have the same asm/futex.h. This consolidates them
    into asm-generic, with the arches including it from their own asm/futex.h.

    In the case of UML, this reverts the old broken futex.h and goes back to using
    the same one as almost everyone else.

    Signed-off-by: Jeff Dike
    Cc: Paolo 'Blaisorblade' Giarrusso
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     
  • 1fd73c6b6   [PATCH] Kill L1_CACHE_SHIFT_MAX ... Browse Code »

    Kill L1_CACHE_SHIFT from all arches. Since L1_CACHE_SHIFT_MAX is not used
    anymore with the introduction of INTERNODE_CACHE, kill L1_CACHE_SHIFT_MAX.

    Signed-off-by: Ravikiran Thirumalai
    Signed-off-by: Shai Fultheim
    Signed-off-by: Andi Kleen
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Ravikiran G Thirumalai
     

07 Jan, 2006

2 commits

  • d3cb48714   [PATCH] atomic_long_t & include/asm-generic/atomic.h V2 ... Browse Code »

    Several counters already have the need to use 64 atomic variables on 64 bit
    platforms (see mm_counter_t in sched.h). We have to do ugly ifdefs to fall
    back to 32 bit atomic on 32 bit platforms.

    The VM statistics patch that I am working on will also make more extensive
    use of atomic64.

    This patch introduces a new type atomic_long_t by providing definitions in
    asm-generic/atomic.h that works similar to the c "long" type. Its 32 bits
    on 32 bit platforms and 64 bits on 64 bit platforms.

    Also cleans up the determination of the mm_counter_t in sched.h.

    Signed-off-by: Christoph Lameter
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Christoph Lameter
     
  • f6b3ec238   [PATCH] madvise(MADV_REMOVE): remove pages from tmpfs shm backing store ... Browse Code »

    Here is the patch to implement madvise(MADV_REMOVE) - which frees up a
    given range of pages & its associated backing store. Current
    implementation supports only shmfs/tmpfs and other filesystems return
    -ENOSYS.

    "Some app allocates large tmpfs files, then when some task quits and some
    client disconnect, some memory can be released. However the only way to
    release tmpfs-swap is to MADV_REMOVE". - Andrea Arcangeli

    Databases want to use this feature to drop a section of their bufferpool
    (shared memory segments) - without writing back to disk/swap space.

    This feature is also useful for supporting hot-plug memory on UML.

    Concerns raised by Andrew Morton:

    - "We have no plan for holepunching! If we _do_ have such a plan (or
    might in the future) then what would the API look like? I think
    sys_holepunch(fd, start, len), so we should start out with that."

    - Using madvise is very weird, because people will ask "why do I need to
    mmap my file before I can stick a hole in it?"

    - None of the other madvise operations call into the filesystem in this
    manner. A broad question is: is this capability an MM operation or a
    filesytem operation? truncate, for example, is a filesystem operation
    which sometimes has MM side-effects. madvise is an mm operation and with
    this patch, it gains FS side-effects, only they're really, really
    significant ones."

    Comments:

    - Andrea suggested the fs operation too but then it's more efficient to
    have it as a mm operation with fs side effects, because they don't
    immediatly know fd and physical offset of the range. It's possible to
    fixup in userland and to use the fs operation but it's more expensive,
    the vmas are already in the kernel and we can use them.

    Short term plan & Future Direction:

    - We seem to need this interface only for shmfs/tmpfs files in the short
    term. We have to add hooks into the filesystem for correctness and
    completeness. This is what this patch does.

    - In the future, plan is to support both fs and mmap apis also. This
    also involves (other) filesystem specific functions to be implemented.

    - Current patch doesn't support VM_NONLINEAR - which can be addressed in
    the future.

    Signed-off-by: Badari Pulavarty
    Cc: Hugh Dickins
    Cc: Andrea Arcangeli
    Cc: Michael Kerrisk
    Cc: Ulrich Drepper
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Badari Pulavarty
     

04 Jan, 2006

1 commit

16 Nov, 2005

2 commits

14 Nov, 2005

2 commits

  • 8426e1f6a   [PATCH] atomic: inc_not_zero ... Browse Code »

    Introduce an atomic_inc_not_zero operation. Make this a special case of
    atomic_add_unless because lockless pagecache actually wants
    atomic_inc_not_negativeone due to its offset refcount.

    Signed-off-by: Nick Piggin
    Cc: "Paul E. McKenney"
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     
  • 4a6dae6d3   [PATCH] atomic: cmpxchg ... Browse Code »

    Introduce an atomic_cmpxchg operation.

    Signed-off-by: Nick Piggin
    Cc: "Paul E. McKenney"
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

07 Nov, 2005

1 commit

31 Oct, 2005

2 commits

22 Sep, 2005

1 commit

  • 676067cfe   [PATCH] Remove unused var from asm/futex.h ... Browse Code »

    As recently done by Russell King for ARM, commit
    4732efbeb997189d9f9b04708dc26bf8613ed721 introduces a generic asm/futex.h copied
    along most arches, which includes a "-ENOSYS support" to be changed if needed.
    However, it includes an unused var (taken from the "real" version) which GCC
    warns about.

    Remove it from all arches having that file version (i.e. same GIT id).
    $ git-diff-tree -r HEAD
    and
    $ git-ls-tree -r HEAD include/|grep 9feff4ce1424bc390608326240be369eb13aa648

    may be more interesting than looking at the patch itself, to make sure I've
    just copied the arm header to all other archs having the original dummy version
    of this file.

    Cc: Jakub Jelinek
    Signed-off-by: Paolo 'Blaisorblade' Giarrusso
    Signed-off-by: Linus Torvalds

    Paolo 'Blaisorblade' Giarrusso
     

08 Sep, 2005

8 commits

  • 8d286aa5e   [PATCH] Clean up struct flock64 definitions ... Browse Code »

    This patch gathers all the struct flock64 definitions (and the operations),
    puts them under !CONFIG_64BIT and cleans up the arch files.

    Signed-off-by: Stephen Rothwell
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Stephen Rothwell
     
  • 5ac353f9b   [PATCH] Clean up struct flock definitions ... Browse Code »

    This patch just gathers together all the struct flock definitions except
    xtensa into asm-generic/fcntl.h.

    Signed-off-by: Stephen Rothwell
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Stephen Rothwell
     
  • 1abf62afb   [PATCH] Clean up the fcntl operations ... Browse Code »

    This patch puts the most popular of each fcntl operation/flag into
    asm-generic/fcntl.h and cleans up the arch files.

    Signed-off-by: Stephen Rothwell
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Stephen Rothwell
     
  • e64ca97fd   [PATCH] Clean up the open flags ... Browse Code »

    This patch puts the most popular of each open flag into asm-generic/fcntl.h
    and cleans up the arch files.

    Signed-off-by: Stephen Rothwell
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Stephen Rothwell
     
  • 9317259ea   [PATCH] Create asm-generic/fcntl.h ... Browse Code »

    This set of patches creates asm-generic/fcntl.h and consolidates as much as
    possible from the asm-*/fcntl.h files into it.

    This patch just gathers all the identical bits of the asm-*/fcntl.h files into
    asm-generic/fcntl.h.

    Signed-off-by: Stephen Rothwell
    Signed-off-by: Yoichi Yuasa
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Stephen Rothwell
     
  • 97de50c0a   [PATCH] remove verify_area(): remove verify_area() from various uaccess.h headers ... Browse Code »

    Remove the deprecated (and unused) verify_area() from various uaccess.h
    headers.

    Signed-off-by: Jesper Juhl
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jesper Juhl
     
  • 36d57ac4a   [PATCH] auxiliary vector cleanups ... Browse Code »

    The size of auxiliary vector is fixed at 42 in linux/sched.h. But it isn't
    very obvious when looking at linux/elf.h. This patch adds AT_VECTOR_SIZE
    so that we can change it if necessary when a new vector is added.

    Because of include file ordering problems, doing this necessitated the
    extraction of the AT_* symbols into a standalone header file.

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

    H. J. Lu
     
  • 4732efbeb   [PATCH] FUTEX_WAKE_OP: pthread_cond_signal() speedup ... Browse Code »

    ATM pthread_cond_signal is unnecessarily slow, because it wakes one waiter
    (which at least on UP usually means an immediate context switch to one of
    the waiter threads). This waiter wakes up and after a few instructions it
    attempts to acquire the cv internal lock, but that lock is still held by
    the thread calling pthread_cond_signal. So it goes to sleep and eventually
    the signalling thread is scheduled in, unlocks the internal lock and wakes
    the waiter again.

    Now, before 2003-09-21 NPTL was using FUTEX_REQUEUE in pthread_cond_signal
    to avoid this performance issue, but it was removed when locks were
    redesigned to the 3 state scheme (unlocked, locked uncontended, locked
    contended).

    Following scenario shows why simply using FUTEX_REQUEUE in
    pthread_cond_signal together with using lll_mutex_unlock_force in place of
    lll_mutex_unlock is not enough and probably why it has been disabled at
    that time:

    The number is value in cv->__data.__lock.
    thr1 thr2 thr3
    0 pthread_cond_wait
    1 lll_mutex_lock (cv->__data.__lock)
    0 lll_mutex_unlock (cv->__data.__lock)
    0 lll_futex_wait (&cv->__data.__futex, futexval)
    0 pthread_cond_signal
    1 lll_mutex_lock (cv->__data.__lock)
    1 pthread_cond_signal
    2 lll_mutex_lock (cv->__data.__lock)
    2 lll_futex_wait (&cv->__data.__lock, 2)
    2 lll_futex_requeue (&cv->__data.__futex, 0, 1, &cv->__data.__lock)
    # FUTEX_REQUEUE, not FUTEX_CMP_REQUEUE
    2 lll_mutex_unlock_force (cv->__data.__lock)
    0 cv->__data.__lock = 0
    0 lll_futex_wake (&cv->__data.__lock, 1)
    1 lll_mutex_lock (cv->__data.__lock)
    0 lll_mutex_unlock (cv->__data.__lock)
    # Here, lll_mutex_unlock doesn't know there are threads waiting
    # on the internal cv's lock

    Now, I believe it is possible to use FUTEX_REQUEUE in pthread_cond_signal,
    but it will cost us not one, but 2 extra syscalls and, what's worse, one of
    these extra syscalls will be done for every single waiting loop in
    pthread_cond_*wait.

    We would need to use lll_mutex_unlock_force in pthread_cond_signal after
    requeue and lll_mutex_cond_lock in pthread_cond_*wait after lll_futex_wait.

    Another alternative is to do the unlocking pthread_cond_signal needs to do
    (the lock can't be unlocked before lll_futex_wake, as that is racy) in the
    kernel.

    I have implemented both variants, futex-requeue-glibc.patch is the first
    one and futex-wake_op{,-glibc}.patch is the unlocking inside of the kernel.
    The kernel interface allows userland to specify how exactly an unlocking
    operation should look like (some atomic arithmetic operation with optional
    constant argument and comparison of the previous futex value with another
    constant).

    It has been implemented just for ppc*, x86_64 and i?86, for other
    architectures I'm including just a stub header which can be used as a
    starting point by maintainers to write support for their arches and ATM
    will just return -ENOSYS for FUTEX_WAKE_OP. The requeue patch has been
    (lightly) tested just on x86_64, the wake_op patch on ppc64 kernel running
    32-bit and 64-bit NPTL and x86_64 kernel running 32-bit and 64-bit NPTL.

    With the following benchmark on UP x86-64 I get:

    for i in nptl-orig nptl-requeue nptl-wake_op; do echo time elf/ld.so --library-path .:$i /tmp/bench; \
    for j in 1 2; do echo ( time elf/ld.so --library-path .:$i /tmp/bench ) 2>&1; done; done
    time elf/ld.so --library-path .:nptl-orig /tmp/bench
    real 0m0.655s user 0m0.253s sys 0m0.403s
    real 0m0.657s user 0m0.269s sys 0m0.388s
    time elf/ld.so --library-path .:nptl-requeue /tmp/bench
    real 0m0.496s user 0m0.225s sys 0m0.271s
    real 0m0.531s user 0m0.242s sys 0m0.288s
    time elf/ld.so --library-path .:nptl-wake_op /tmp/bench
    real 0m0.380s user 0m0.176s sys 0m0.204s
    real 0m0.382s user 0m0.175s sys 0m0.207s

    The benchmark is at:
    http://sourceware.org/ml/libc-alpha/2005-03/txt00001.txt
    Older futex-requeue-glibc.patch version is at:
    http://sourceware.org/ml/libc-alpha/2005-03/txt00002.txt
    Older futex-wake_op-glibc.patch version is at:
    http://sourceware.org/ml/libc-alpha/2005-03/txt00003.txt
    Will post a new version (just x86-64 fixes so that the patch
    applies against pthread_cond_signal.S) to libc-hacker ml soon.

    Attached is the kernel FUTEX_WAKE_OP patch as well as a simple-minded
    testcase that will not test the atomicity of the operation, but at least
    check if the threads that should have been woken up are woken up and
    whether the arithmetic operation in the kernel gave the expected results.

    Acked-by: Ingo Molnar
    Cc: Ulrich Drepper
    Cc: Jamie Lokier
    Cc: Rusty Russell
    Signed-off-by: Yoichi Yuasa
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jakub Jelinek
     

05 Sep, 2005

2 commits

  • fa5b08d5f   [PATCH] sab: consolidate kmem_bufctl_t ... Browse Code »

    This is used only in slab.c and each architecture gets to define whcih
    underlying type is to be used.

    Seems a bit silly - move it to slab.c and use the same type for all
    architectures: unsigned int.

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

    Kyle Moffett
     
  • fd4fd5aac   [PATCH] mm: consolidate get_order ... Browse Code »

    Someone mentioned that almost all the architectures used basically the same
    implementation of get_order. This patch consolidates them into
    asm-generic/page.h and includes that in the appropriate places. The
    exceptions are ia64 and ppc which have their own (presumably optimised)
    versions.

    Signed-off-by: Stephen Rothwell
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Stephen Rothwell
     

30 Aug, 2005

1 commit

28 Jul, 2005

4 commits