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Rev 3031 Rev 3260
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    if (size & (size - 1))
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    if (size & (size - 1))
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        ++order;
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        ++order;
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    return order;
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    return order;
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}
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extern int x86_clflush_size;
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static inline void clflush(volatile void *__p)
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{
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    asm volatile("clflush %0" : "+m" (*(volatile char*)__p));
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}
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void
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drm_clflush_virt_range(char *addr, unsigned long length)
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{
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    char *end = addr + length;
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    mb();
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    for (; addr < end; addr += x86_clflush_size)
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        clflush(addr);
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    clflush(end - 1);
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    mb();
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    return;
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}