On Wed, 14 Feb 2007 14:41:05 -0800 Roland Dreier wrote:
> Commit 42da9cbd ("mm: mincore anon") breaks CONFIG_SWAP=n builds with:
>
> mm/built-in.o: In function `sys_mincore':
> (.text+0xe2c4): undefined reference to `swapper_space'
>
> because swapper_space is used unconditionally in mm/mincore.c but only
> defined in swap_state.c, which isn't built if CONFIG_SWAP=n.
>
> I'd include a patch but I'm not sure what the right fix is really --
> the naively obvious thing to do would be to add an #ifdef to mincore.c
> like the below, but I don't know this area at all well enough to be
> confident in the fix.
>
> diff --git a/mm/mincore.c b/mm/mincore.c
> index 95c5f49..266506f 100644
> --- a/mm/mincore.c
> +++ b/mm/mincore.c
> @@ -109,8 +109,9 @@ static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag
> } else if (pte_file(pte)) {
> pgoff = pte_to_pgoff(pte);
> present = mincore_page(vma->vm_file->f_mapping, pgoff);
> -
> - } else { /* pte is a swap entry */
> + }
> +#ifdef CONFIG_SWAP
> + else { /* pte is a swap entry */
> swp_entry_t entry = pte_to_swp_entry(pte);
> if (is_migration_entry(entry)) {
> /* migration entries are always uptodate */
> @@ -120,6 +121,7 @@ static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag
> present = mincore_page(&swapper_space, pgoff);
> }
> }
> +#endif /* CONFIG_SWAP */
> }
> pte_unmap_unlock(ptep-1, ptl);
>
> -
We've beat this almost to death... just need some patch merged.
or reverted.
---
~Randy
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