Doug / smarc-fsl-linux-kernel

15 Jul, 2006

1 commit

  • 52393ccc0   [PATCH] remove set_wmb - arch removal ... Browse Code »

    set_wmb should not be used in the kernel because it just confuses the
    code more and has no benefit. Since it is not currently used in the
    kernel this patch removes it so that new code does not include it.

    All archs define set_wmb(var, value) to do { var = value; wmb(); }
    while(0) except ia64 and sparc which use a mb() instead. But this is
    still moot since it is not used anyway.

    Hasn't been tested on any archs but x86 and x86_64 (and only compiled
    tested)

    Signed-off-by: Steven Rostedt
    Signed-off-by: Linus Torvalds

    Steven Rostedt
     

05 Jul, 2006

1 commit

  • 6fa0cb114   Merge git://git.infradead.org/hdrinstall-2.6 ... Browse Code »

    * git://git.infradead.org/hdrinstall-2.6:
    Remove export of include/linux/isdn/tpam.h
    Remove and from userspace export
    Restrict headers exported to userspace for SPARC and SPARC64
    Add empty Kbuild files for 'make headers_install' in remaining arches.
    Add Kbuild file for Alpha 'make headers_install'
    Add Kbuild file for SPARC 'make headers_install'
    Add Kbuild file for IA64 'make headers_install'
    Add Kbuild file for S390 'make headers_install'
    Add Kbuild file for i386 'make headers_install'
    Add Kbuild file for x86_64 'make headers_install'
    Add Kbuild file for PowerPC 'make headers_install'
    Add generic Kbuild files for 'make headers_install'
    Basic implementation of 'make headers_check'
    Basic implementation of 'make headers_install'

    Linus Torvalds
     

03 Jul, 2006

1 commit

30 Jun, 2006

1 commit

  • 877ce7c1b   [AF_UNIX]: Datagram getpeersec ... Browse Code »

    This patch implements an API whereby an application can determine the
    label of its peer's Unix datagram sockets via the auxiliary data mechanism of
    recvmsg.

    Patch purpose:

    This patch enables a security-aware application to retrieve the
    security context of the peer of a Unix datagram socket. The application
    can then use this security context to determine the security context for
    processing on behalf of the peer who sent the packet.

    Patch design and implementation:

    The design and implementation is very similar to the UDP case for INET
    sockets. Basically we build upon the existing Unix domain socket API for
    retrieving user credentials. Linux offers the API for obtaining user
    credentials via ancillary messages (i.e., out of band/control messages
    that are bundled together with a normal message). To retrieve the security
    context, the application first indicates to the kernel such desire by
    setting the SO_PASSSEC option via getsockopt. Then the application
    retrieves the security context using the auxiliary data mechanism.

    An example server application for Unix datagram socket should look like this:

    toggle = 1;
    toggle_len = sizeof(toggle);

    setsockopt(sockfd, SOL_SOCKET, SO_PASSSEC, &toggle, &toggle_len);
    recvmsg(sockfd, &msg_hdr, 0);
    if (msg_hdr.msg_controllen > sizeof(struct cmsghdr)) {
    cmsg_hdr = CMSG_FIRSTHDR(&msg_hdr);
    if (cmsg_hdr->cmsg_len cmsg_level == SOL_SOCKET &&
    cmsg_hdr->cmsg_type == SCM_SECURITY) {
    memcpy(&scontext, CMSG_DATA(cmsg_hdr), sizeof(scontext));
    }
    }

    sock_setsockopt is enhanced with a new socket option SOCK_PASSSEC to allow
    a server socket to receive security context of the peer.

    Testing:

    We have tested the patch by setting up Unix datagram client and server
    applications. We verified that the server can retrieve the security context
    using the auxiliary data mechanism of recvmsg.

    Signed-off-by: Catherine Zhang
    Acked-by: Acked-by: James Morris
    Signed-off-by: David S. Miller

    Catherine Zhang
     

26 Jun, 2006

1 commit

23 Jun, 2006

1 commit

  • 908dcecda   [PATCH] adjust handle_IRR_event() return type ... Browse Code »

    Correct the return type of handle_IRQ_event() (inconsistency noticed during
    Xen development), and remove redundant declarations. The return type
    adjustment required breaking out the definition of irqreturn_t into a
    separate header, in order to satisfy current include order dependencies.

    Signed-off-by: Jan Beulich

    Cc: Richard Henderson
    Cc: Ivan Kokshaysky
    Cc: Russell King
    Cc: Ian Molton
    Cc: Mikael Starvik
    Cc: Yoshinori Sato
    Cc: Hirokazu Takata
    Cc: Heiko Carstens
    Cc: Martin Schwidefsky
    Cc: William Lee Irwin III
    Cc: "David S. Miller"
    Cc: Miles Bader
    Cc: Geert Uytterhoeven
    Cc: Roman Zippel
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jan Beulich
     

18 Jun, 2006

1 commit

29 Apr, 2006

1 commit

26 Apr, 2006

1 commit

28 Mar, 2006

1 commit

27 Mar, 2006

1 commit

  • d142d8601   [PATCH] bitops: arm26: use generic bitops ... Browse Code »

    - remove __{,test_and_}{set,clear,change}_bit() and test_bit()
    - remove ffz()
    - remove __ffs()
    - remove generic_fls()
    - remove generic_fls64()
    - remove generic_ffs()
    - remove sched_find_first_bit()
    - remove generic_hweight{32,16,8}()

    Signed-off-by: Akinobu Mita
    Cc: Ian Molton
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Akinobu Mita
     

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
     

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
     

02 Feb, 2006

6 commits

17 Jan, 2006

2 commits

  • 511c3a2be   [PATCH] arm26: add L1_CACHE_SHIFT ... Browse Code »

    Fix reiserfs compilation as a side effect =)

    Signed-off-by: Alexey Dobriyan
    Acked-by: Ian Molton
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Alexey Dobriyan
     
  • 96419b7c4   [PATCH] fix arm26 THREAD_SIZE ... Browse Code »

    arm26 currently has a 256 kB THREAD_SIZE (sic).

    Looking at the comment in the code, this seems to be based on a
    misunderstanding.

    The comment says:
    this needs attention (see kernel/fork.c which gets a nice div by zero if
    this is lower than 8*32768

    kernel/fork.c does:
    max_threads = mempages / (8 * THREAD_SIZE / PAGE_SIZE)

    Therefore, a division by 0 is impossible for all reasonable cases with
    THREAD_SIZE >= PAGE_SIZE.

    Since the minimum PAGE_SIZE Linux uses on the arm26 architecture is 16k,
    PAGE_SIZE should be sufficient for THREAD_SIZE.

    Signed-off-by: Adrian Bunk
    Signed-off-by: Ian Molton
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Adrian Bunk
     

13 Jan, 2006

5 commits

11 Jan, 2006

1 commit

10 Jan, 2006

1 commit

09 Jan, 2006

1 commit

  • 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
     

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

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
     

31 Oct, 2005

3 commits

  • 727a53bd5   [PATCH] semaphore: Remove __MUTEX_INITIALIZER() ... Browse Code »

    __MUTEX_INITIALIZER() has no users, and equates to the more commonly used
    DECLARE_MUTEX(), thus making it pretty much redundant. Remove it for good.

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

    Arthur Othieno
     
  • 1426d7a81   [PATCH] vm: remove unused/broken page_pte[_prot] macros ... Browse Code »

    This patch removes page_pte_prot and page_pte macros from all
    architectures. Some architectures define both, some only page_pte (broken)
    and others none. These macros are not used anywhere.

    page_pte_prot(page, prot) is identical to mk_pte(page, prot) and
    page_pte(page) is identical to page_pte_prot(page, __pgprot(0)).

    * The following architectures define both page_pte_prot and page_pte

    arm, arm26, ia64, sh64, sparc, sparc64

    * The following architectures define only page_pte (broken)

    frv, i386, m32r, mips, sh, x86-64

    * All other architectures define neither

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

    Tejun Heo
     
  • dfb7dac3a   [PATCH] unify sys_ptrace prototype ... Browse Code »

    Make sure we always return, as all syscalls should. Also move the common
    prototype to

    Signed-off-by: Christoph Hellwig
    Signed-off-by: Miklos Szeredi
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Christoph Hellwig
     

30 Oct, 2005

2 commits

  • fc2acab31   [PATCH] mm: tlb_finish_mmu forget rss ... Browse Code »

    zap_pte_range has been counting the pages it frees in tlb->freed, then
    tlb_finish_mmu has used that to update the mm's rss. That got stranger when I
    added anon_rss, yet updated it by a different route; and stranger when rss and
    anon_rss became mm_counters with special access macros. And it would no
    longer be viable if we're relying on page_table_lock to stabilize the
    mm_counter, but calling tlb_finish_mmu outside that lock.

    Remove the mmu_gather's freed field, let tlb_finish_mmu stick to its own
    business, just decrement the rss mm_counter in zap_pte_range (yes, there was
    some point to batching the update, and a subsequent patch restores that). And
    forget the anal paranoia of first reading the counter to avoid going negative
    - if rss does go negative, just fix that bug.

    Remove the mmu_gather's flushes and avoided_flushes from arm and arm26: no use
    was being made of them. But arm26 alone was actually using the freed, in the
    way some others use need_flush: give it a need_flush. arm26 seems to prefer
    spaces to tabs here: respect that.

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

    Hugh Dickins
     
  • 4d6ddfa92   [PATCH] mm: tlb_is_full_mm was obscure ... Browse Code »

    tlb_is_full_mm? What does that mean? The TLB is full? No, it means that the
    mm's last user has gone and the whole mm is being torn down. And it's an
    inline function because sparc64 uses a different (slightly better)
    "tlb_frozen" name for the flag others call "fullmm".

    And now the ptep_get_and_clear_full macro used in zap_pte_range refers
    directly to tlb->fullmm, which would be wrong for sparc64. Rather than
    correct that, I'd prefer to scrap tlb_is_full_mm altogether, and change
    sparc64 to just use the same poor name as everyone else - is that okay?

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

    Hugh Dickins