Eric Lee / smarc-ti-linux-kernel

28 Oct, 2005

1 commit

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

9 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
     
  • f26fdd599   [PATCH] CHECK_IRQ_PER_CPU() to avoid dead code in __do_IRQ() ... Browse Code »

    IRQ_PER_CPU is not used by all architectures. This patch introduces the
    macros ARCH_HAS_IRQ_PER_CPU and CHECK_IRQ_PER_CPU() to avoid the generation
    of dead code in __do_IRQ().

    ARCH_HAS_IRQ_PER_CPU is defined by architectures using IRQ_PER_CPU in their
    include/asm_ARCH/irq.h file.

    Through grepping the tree I found the following architectures currently use
    IRQ_PER_CPU:

    cris, ia64, ppc, ppc64 and parisc.

    Signed-off-by: Karsten Wiese
    Acked-by: Ingo Molnar
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Karsten Wiese
     
  • 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

12 commits

27 Jul, 2005

1 commit

  • 7c9034735   [PATCH] Add emergency_restart() ... Browse Code »

    When the kernel is working well and we want to restart cleanly
    kernel_restart is the function to use. But in many instances
    the kernel wants to reboot when thing are expected to be working
    very badly such as from panic or a software watchdog handler.

    This patch adds the function emergency_restart() so that
    callers can be clear what semantics they expect when calling
    restart. emergency_restart() is expected to be callable
    from interrupt context and possibly reliable in even more
    trying circumstances.

    This is an initial generic implementation for all architectures.

    Signed-off-by: Eric W. Biederman
    Signed-off-by: Linus Torvalds

    Eric W. Biederman
     

24 Jun, 2005

1 commit

  • dcd497f99   [PATCH] streamline preempt_count type across archs ... Browse Code »

    The preempt_count member of struct thread_info is currently either defined
    as int, unsigned int or __s32 depending on arch. This patch makes the type
    of preempt_count an int on all archs.

    Having preempt_count be an unsigned type prevents the catching of
    preempt_count < 0 bugs, and using int on some archs and __s32 on others is
    not exactely "neat" - much nicer when it's just int all over.

    A previous version of this patch was already ACK'ed by Robert Love, and the
    only change in this version of the patch compared to the one he ACK'ed is
    that this one also makes sure the preempt_count member is consistently
    commented.

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

    Jesper Juhl
     

04 May, 2005

1 commit

  • b1ecb4c3a   [PATCH] asm/signal.h unification ... Browse Code »

    New file - asm-generic/signal.h. Contains declarations of
    __sighandler_t, __sigrestore_t, SIG_DFL, SIG_IGN, SIG_ERR and default
    definitions of SIG_BLOCK, SIG_UNBLOCK and SIG_SETMASK.

    asm-*/signal.h switched to including it. The only exception is
    asm-parisc/signal.h that wants its own declaration of __sighandler_t;
    that one is left as-is.

    asm-ppc64/signal.h required one more thing - unlike everybody else it
    used __sigrestorer_t instead of usual __sigrestore_t. PPC64 switched to
    common spelling.

    Signed-off-by: Al Viro
    Signed-off-by: Linus Torvalds

    Al Viro
     

01 May, 2005

2 commits

  • 7f261b5f0   [PATCH] move SA_xxx defines to linux/signal.h ... Browse Code »

    The attached patch moves the IRQ-related SA_xxx flags (namely, SA_PROBE,
    SA_SAMPLE_RANDOM and SA_SHIRQ) from all the arch-specific headers to
    linux/signal.h. This looks like a left-over after the irq-handling code
    was consolidated. The code was moved to kernel/irq/*, but the flags are
    still left per-arch.

    Right now, adding a new IRQ flag to the arch-specific header, like this
    patch does:
    http://cvs.sourceforge.net/viewcvs.py/*checkout*/alsa/alsa-driver/utils/patches/pcsp-kernel-2.6.10-03.diff?rev=1.1
    no longer works, it breaks the compilation for all other arches, unless you
    add that flag to all the other arch-specific headers too. So I think such
    a clean-up makes sense.

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

    Stas Sergeev
     
  • cd7619d6b   [PATCH] Exterminate PAGE_BUG ... Browse Code »

    Remove PAGE_BUG - repalce it with BUG and BUG_ON.

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

    Matt Mackall
     

20 Apr, 2005

1 commit

17 Apr, 2005

1 commit

  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »
    212

    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