Eric Lee / smarc-fsl-linux-kernel

27 Sep, 2006

4 commits

  • 930e652a2   [PATCH] NOMMU: Make futexes work under NOMMU conditions ... Browse Code »

    Make futexes work under NOMMU conditions.

    This can be tested by running this in one shell:

    #define SYSERROR(X, Y) \
    do { if ((long)(X) == -1L) { perror(Y); exit(1); }} while(0)

    int main()
    {
    int shmid, tmp, *f, n;

    shmid = shmget(23, 4, IPC_CREAT|0666);
    SYSERROR(shmid, "shmget");

    f = shmat(shmid, NULL, 0);
    SYSERROR(f, "shmat");

    n = *f;
    printf("WAIT: %p{%x}\n", f, n);
    tmp = futex(f, FUTEX_WAIT, n, NULL, NULL, 0);
    SYSERROR(tmp, "futex");
    printf("WAITED: %d\n", tmp);

    tmp = shmdt(f);
    SYSERROR(tmp, "shmdt");

    exit(0);
    }

    And then this in the other shell:

    #define SYSERROR(X, Y) \
    do { if ((long)(X) == -1L) { perror(Y); exit(1); }} while(0)

    int main()
    {
    int shmid, tmp, *f;

    shmid = shmget(23, 4, IPC_CREAT|0666);
    SYSERROR(shmid, "shmget");

    f = shmat(shmid, NULL, 0);
    SYSERROR(f, "shmat");

    (*f)++;
    printf("WAKE: %p{%x}\n", f, *f);
    tmp = futex(f, FUTEX_WAKE, 1, NULL, NULL, 0);
    SYSERROR(tmp, "futex");
    printf("WOKE: %d\n", tmp);

    tmp = shmdt(f);
    SYSERROR(tmp, "shmdt");

    exit(0);
    }

    The first program will set up a SYSV IPC SHM segment and wait on a futex in it
    for the number at the start to change. The program will increment that number
    and wake the first program up. This leads to output of the form:

    SHELL 1 SHELL 2
    ======================= =======================
    # /dowait
    WAIT: 0xc32ac000{0}
    # /dowake
    WAKE: 0xc32ac000{1}
    WAITED: 0 WOKE: 1

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

    David Howells
     
  • 0112c4c64   [PATCH] NOMMU: Add docs about shared memory ... Browse Code »

    Add documentation about using shared memory in NOMMU mode.

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

    David Howells
     
  • 6fa5f80bc   [PATCH] NOMMU: Make mremap() partially work for NOMMU kernels ... Browse Code »

    Make mremap() partially work for NOMMU kernels. It may resize a VMA provided
    that it doesn't exceed the size of the slab object in which the storage is
    allocated that the VMA refers to. Shareable VMAs may not be resized.

    Moving VMAs (as permitted by MREMAP_MAYMOVE) is not currently supported.

    This patch also makes use of the fact that the VMA list is now ordered to cut
    it short when possible.

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

    David Howells
     
  • dbf8685c8   [PATCH] NOMMU: Implement /proc/pid/maps for NOMMU ... Browse Code »

    Implement /proc/pid/maps for NOMMU by reading the vm_area_list attached to
    current->mm->context.vmlist.

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

    David Howells
     

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