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}

extern int x86_clflush_size;

void drm_clflush_virt_range(void *addr, unsigned long length)

{

    char *tmp = addr;

    char *end = tmp + length;

    mb();

    for (; tmp < end; tmp += x86_clflush_size)

        clflush(tmp);

    clflush(end - 1);

    mb();

    return;