Eric Lee / linux-smarc-t335x-v3.2

18 Feb, 2006

1 commit

  • 74910e6c7   [PATCH] select: time comparison fixes ... Browse Code »

    I got all of these backwards. We want to return

    min(input timeout, new timeout)

    to userspace to prevent increasing the time-remaining value.

    Thanks to Ernst Herzberg for reporting and diagnosing.

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

    Andrew Morton
     

12 Feb, 2006

1 commit

  • 643a65454   [PATCH] select: fix returned timeval ... Browse Code »

    With David Woodhouse

    select() presently has a habit of increasing the value of the user's
    `timeout' argument on return.

    We were writing back a timeout larger than the original. We _deliberately_
    round up, since we know we must wait at _least_ as long as the caller asks
    us to.

    The patch adds a couple of helper functions for magnitude comparison of
    timespecs and of timevals, and uses them to prevent the various poll and
    select functions from returning a timeout which is larger than the one which
    was passed in.

    The patch also fixes a bug in compat_sys_pselect7(): it was adding the new
    timeout value to the old one and was returning that. It should just return
    the new timeout value.

    (We have various handy timespec/timeval-to-from-nsec conversion functions in
    time.h. But this code open-codes it all).

    Cc: "David S. Miller"
    Cc: Andi Kleen
    Cc: Ulrich Drepper
    Cc: Thomas Gleixner
    Cc: george anzinger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Andrew Morton
     

08 Feb, 2006

1 commit

19 Jan, 2006

1 commit

  • 9f72949f6   [PATCH] Add pselect/ppoll system call implementation ... Browse Code »

    The following implementation of ppoll() and pselect() system calls
    depends on the architecture providing a TIF_RESTORE_SIGMASK flag in the
    thread_info.

    These system calls have to change the signal mask during their
    operation, and signal handlers must be invoked using the new, temporary
    signal mask. The old signal mask must be restored either upon successful
    exit from the system call, or upon returning from the invoked signal
    handler if the system call is interrupted. We can't simply restore the
    original signal mask and return to userspace, since the restored signal
    mask may actually block the signal which interrupted the system call.

    The TIF_RESTORE_SIGMASK flag deals with this by causing the syscall exit
    path to trap into do_signal() just as TIF_SIGPENDING does, and by
    causing do_signal() to use the saved signal mask instead of the current
    signal mask when setting up the stack frame for the signal handler -- or
    by causing do_signal() to simply restore the saved signal mask in the
    case where there is no handler to be invoked.

    The first patch implements the sys_pselect() and sys_ppoll() system
    calls, which are present only if TIF_RESTORE_SIGMASK is defined. That
    #ifdef should go away in time when all architectures have implemented
    it. The second patch implements TIF_RESTORE_SIGMASK for the PowerPC
    kernel (in the -mm tree), and the third patch then removes the
    arch-specific implementations of sys_rt_sigsuspend() and replaces them
    with generic versions using the same trick.

    The fourth and fifth patches, provided by David Howells, implement
    TIF_RESTORE_SIGMASK for FR-V and i386 respectively, and the sixth patch
    adds the syscalls to the i386 syscall table.

    This patch:

    Add the pselect() and ppoll() system calls, providing core routines usable by
    the original select() and poll() system calls and also the new calls (with
    their semantics w.r.t timeouts).

    Signed-off-by: David Woodhouse
    Cc: Michael Kerrisk
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    David Woodhouse
     

10 Sep, 2005

2 commits

  • b835996f6   [PATCH] files: lock-free fd look-up ... Browse Code »

    With the use of RCU in files structure, the look-up of files using fds can now
    be lock-free. The lookup is protected by rcu_read_lock()/rcu_read_unlock().
    This patch changes the readers to use lock-free lookup.

    Signed-off-by: Maneesh Soni
    Signed-off-by: Ravikiran Thirumalai
    Signed-off-by: Dipankar Sarma
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Dipankar Sarma
     
  • badf16621   [PATCH] files: break up files struct ... Browse Code »

    In order for the RCU to work, the file table array, sets and their sizes must
    be updated atomically. Instead of ensuring this through too many memory
    barriers, we put the arrays and their sizes in a separate structure. This
    patch takes the first step of putting the file table elements in a separate
    structure fdtable that is embedded withing files_struct. It also changes all
    the users to refer to the file table using files_fdtable() macro. Subsequent
    applciation of RCU becomes easier after this.

    Signed-off-by: Dipankar Sarma
    Signed-Off-By: David Howells
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Dipankar Sarma
     

06 May, 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