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    Subject[PATCH] swap 02/13 !CONFIG_SWAP try_to_unmap
    Raised #endif CONFIG_SWAP in shrink_list, it was excluding
    try_to_unmap of file pages. Suspect !CONFIG_MMU relied on
    that to suppress try_to_unmap, added SWAP_FAIL stub for it.

    --- swap01/include/linux/swap.h Tue Mar 25 20:42:56 2003
    +++ swap02/include/linux/swap.h Tue Mar 25 20:43:07 2003
    @@ -175,19 +175,18 @@
    void FASTCALL(page_remove_rmap(struct page *, pte_t *));
    int FASTCALL(try_to_unmap(struct page *));

    -/* return values of try_to_unmap */
    -#define SWAP_SUCCESS 0
    -#define SWAP_AGAIN 1
    -#define SWAP_FAIL 2
    -
    /* linux/mm/shmem.c */
    extern int shmem_unuse(swp_entry_t entry, struct page *page);
    -
    #else
    -#define page_referenced(page) \
    - TestClearPageReferenced(page)
    +#define page_referenced(page) TestClearPageReferenced(page)
    +#define try_to_unmap(page) SWAP_FAIL
    #endif /* CONFIG_MMU */

    +/* return values of try_to_unmap */
    +#define SWAP_SUCCESS 0
    +#define SWAP_AGAIN 1
    +#define SWAP_FAIL 2
    +
    #ifdef CONFIG_SWAP
    /* linux/mm/page_io.c */
    extern int swap_readpage(struct file *, struct page *);
    --- swap01/mm/vmscan.c Tue Mar 25 20:42:56 2003
    +++ swap02/mm/vmscan.c Tue Mar 25 20:43:07 2003
    @@ -277,6 +277,7 @@
    pte_chain_lock(page);
    mapping = page->mapping;
    }
    +#endif /* CONFIG_SWAP */

    /*
    * The page is mapped into the page tables of one or more
    @@ -294,7 +295,6 @@
    ; /* try to free the page below */
    }
    }
    -#endif /* CONFIG_SWAP */
    pte_chain_unlock(page);

    /*
    -
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