mmu_gather_t *tlb;??? asm-generic/tlb.h

Question

/*
* remove user pages in a given range.
*/
void zap_page_range(struct mm_struct *mm, unsigned long address, unsigned long size)
{
        mmu_gather_t *tlb;
        pgd_t * dir;
        unsigned long start = address, end = address + size;
        int freed = 0;

        dir = pgd_offset(mm, address);

        /*
         * This is a long-lived spinlock. That's fine.
         * There's no contention, because the page table
         * lock only protects against kswapd anyway, and
         * even if kswapd happened to be looking at this
         * process we _want_ it to get stuck.
         */
        if (address >= end)
                BUG();
        spin_lock(&mm->page_table_lock);
        flush_cache_range(mm, address, end);
        tlb = tlb_gather_mmu(mm);

        do {
                freed += zap_pmd_range(tlb, dir, address, end - address);
                address = (address + PGDIR_SIZE) & PGDIR_MASK;
                dir++;
        } while (address && (address < end));

        /* this will flush any remaining tlb entries */
        tlb_finish_mmu(tlb, start, end);

        /*
         * Update rss for the mm_struct (not necessarily current->mm)
         * Notice that rss is an unsigned long.
         */
        if (mm->rss > freed)
                mm->rss -= freed;
        else
                mm->rss = 0;
        spin_unlock(&mm->page_table_lock);
}
mmu_gather_t 类型定义于asm-generic/tlb.h中，但是asm-generic并非i386架构，如何解释呢？请朋友帮忙！！！不胜感激！

Answer 1

#asm/tlb.h
#include asm-generic/tlb.h
原来如此！