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    Subject2.6.16 hugetlbfs problem

    I seem to be having trouble using hugetlbfs with kernel 2.6.16. I
    have a small test program that worked with 2.6.16-rc5, but fails with
    2.6.16-rc6 or the release. The program is below. Given a path to a
    file on a hugetlbfs, it opens/creates the file, mmaps it and tries to
    access the first word. On 2.6.16-rc5, it works. On 2.6.16, it hangs
    page-faulting until it is killed.

    #include <stdint.h>
    #include <unistd.h>
    #include <sys/types.h>
    #include <stdio.h>
    #include <fcntl.h>
    #include <sys/mman.h>
    #include <sys/stat.h>

    int main(int argc, char *argv[])
    unsigned len = 4 * 1024 * 1024;
    void *vaddr = (void *)0x48000000;
    int hfd;
    void *p;
    int *ip;

    if (!argc || !argv[1] || !argv[1][0]) {
    fprintf(stderr, "Missing argument\n");
    return 1;
    hfd = open(argv[1], O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
    if (hfd < 0) {
    return 1;
    p = mmap(vaddr, len, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED,
    hfd, 0);
    if (p == MAP_FAILED) {
    fprintf(stderr, "mmap failed at %p\n", vaddr);
    return 1;
    ip = p;
    *ip = 0; // This loops on page faults
    printf("Size %d in file %s\n", len, argv[1]);

    return 0;

    Any ideas?

    Mark Rustad,

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