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SubjectRe: Problem to compile 2.4.14 on x86 (cause: mm/swap.c) : patch included in body


Similar problem here (2.4.14):

depmod: *** Unresolved symbols in
/lib/modules/2.4.14/kernel/drivers/block/loop.o
depmod: deactivate_page

/usr/include/linux/swap.h has activate_page but no deactivate_page..

Vladimir Dergachev


On Wed, 7 Nov 2001, Nicson wrote:

> Hi all!
>
> This is my first post on lkml, I tried to do it "by the book" (I read the
> "Unofficial Linus HOWTO" from Jeff Garzik) but may have missed something. My
> apologies if this is the case - and feel free to correct me, could be useful
> next time ;-)
>
> [Disclaimer: I'm not a kernel hacker]
>
> I wanted to compile 2.4.14 on a Dell PowerEdge 2500 with 2x PIII 1GHz, and
> encountered a small problem with the loopback dev. (either included or as a
> module) : the function deactivate_page() was not found.
> The exact error message is:
> ----------------[ start 'make bzImage' output ]-----------------
> [...]
> drivers/block/block.o: In function `lo_send':
> drivers/block/block.o(.text+0x87af): undefined reference to `deactivate_page'
> drivers/block/block.o(.text+0x87f9): undefined reference to `deactivate_page'
> make: *** [vmlinux] Error 1
> ----------------[ end 'make bzImage' output ]-----------------
>
> I tried it also on another x86 box (PIII-UP), same problem.
>
> I traced it back to mm/swap.c and include/linux/swap.h
> On 2.4.13 the function deactivate_page() is present in mm/swap.c, but not in
> 2.4.14
>
> I just added it (and the relevant declaration in include/linux/swap.h), and
> tried compiling 2.4.14 with this modification ---> problem fixed on both
> systems.
>
> I couldn't find exactly who's the maintainer for this section of the kernel
> (and didn't want to bother Linus with something that trivial), so I post this
> on lkml in hope the person-in-charge will see it. I do not read lkml (just
> Kernel-Traffic, thanx Zack Brown for the great job!) so maybe someone else
> already submitted a patch for this bug.
>
> Anyway, here is the small patch (made with diff -urN). It's basically only
> cut&paste stuff :
> ------------------------------[ cut here ]-------------------------------
> diff -urN linux/include/linux/swap.h linux-2.4.14-patched/include/linux/swap.h
> --- linux/include/linux/swap.h Mon Nov 5 21:42:13 2001
> +++ linux-2.4.14-patched/include/linux/swap.h Wed Nov 7 13:17:48 2001
> @@ -105,6 +105,7 @@
> extern void FASTCALL(__lru_cache_del(struct page *));
> extern void FASTCALL(lru_cache_del(struct page *));
>
> +extern void FASTCALL(deactivate_page(struct page *));
> extern void FASTCALL(activate_page(struct page *));
>
> extern void swap_setup(void);
> diff -urN linux/mm/swap.c linux-2.4.14-patched/mm/swap.c
> --- linux/mm/swap.c Sun Nov 4 19:29:49 2001
> +++ linux-2.4.14-patched/mm/swap.c Wed Nov 7 13:17:26 2001
> @@ -33,6 +33,32 @@
> 8, /* do swap I/O in clusters of this size */
> };
>
> +/**
> + * (de)activate_page - move pages from/to active and inactive lists
> + * @page: the page we want to move
> + * @nolock - are we already holding the pagemap_lru_lock?
> + *
> + * Deactivate_page will move an active page to the right
> + * inactive list, while activate_page will move a page back
> + * from one of the inactive lists to the active list. If
> + * called on a page which is not on any of the lists, the
> + * page is left alone.
> + */
> +static inline void deactivate_page_nolock(struct page * page)
> +{
> + if (PageActive(page)) {
> + del_page_from_active_list(page);
> + add_page_to_inactive_list(page);
> + }
> +}
> +
> +void deactivate_page(struct page * page)
> +{
> + spin_lock(&pagemap_lru_lock);
> + deactivate_page_nolock(page);
> + spin_unlock(&pagemap_lru_lock);
> +}
> +
> /*
> * Move an inactive page to the active list.
> */
> -------------------------------[ cut here ]-------------------------
>
>
> Hope this helps...
>
> Cheers!
> --
> Nicolas Ouedraogo
> email: nicson@unforgettable.com
>
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