2.6.15-git9 build failure when CONFIG_SWAP is not set

2.6.15-git9 build failure when CONFIG_SWAP is not set

[Ravikiran G Thirumalai]

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Compile fails when CONFIG_SWAP is not set.  Attaching the .config for
reference.

...

  CHK     include/linux/compile.h
  UPD     include/linux/compile.h
mm/built-in.o: In function `swap_pages':
mm/mempolicy.c:576: undefined reference to `migrate_pages'
mm/mempolicy.c:577: undefined reference to `putback_lru_pages'
mm/mempolicy.c:578: undefined reference to `putback_lru_pages'
mm/built-in.o: In function `migrate_page_add':
mm/mempolicy.c:558: undefined reference to `isolate_lru_page'
mm/built-in.o: In function `do_mbind':
mm/mempolicy.c:677: undefined reference to `putback_lru_pages'
mm/built-in.o: In function `do_migrate_pages':
mm/mempolicy.c:606: undefined reference to `putback_lru_pages'
make: *** [.tmp_vmlinux1] Error 1


Thanks,
Kiran




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Re: 2.6.15-git9 build failure when CONFIG_SWAP is not set

[yhlu]

Please check anoth thread
"can not compile in the latest git"

YH

Re: 2.6.15-git9 build failure when CONFIG_SWAP is not set

[Christoph Lameter]

On Fri, 13 Jan 2006, Ravikiran G Thirumalai wrote:

> Compile fails when CONFIG_SWAP is not set.  Attaching the .config for
> reference.

-- Patch that was sent to Andrew.

Some people apparently run CONFIG_NUMA without CONFIG_SWAP. The migration
code currently depends on swap. This patch provides a set of inline fallback
functions so that the kernel properly compiles. Howeverver, calls to migration
functions will fail.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.15/include/linux/swap.h
===================================================================
--- linux-2.6.15.orig/include/linux/swap.h	2006-01-11 12:49:03.000000000 -0800
+++ linux-2.6.15/include/linux/swap.h	2006-01-13 16:41:19.000000000 -0800
@@ -180,6 +180,11 @@ extern int isolate_lru_page(struct page 
 extern int putback_lru_pages(struct list_head *l);
 extern int migrate_pages(struct list_head *l, struct list_head *t,
 		struct list_head *moved, struct list_head *failed);
+#else
+static inline int isolate_lru_page(struct page *p) { return -ENOSYS; }
+static inline int putback_lru_pages(struct list_head *l) { return 0; }
+static inline int migrate_pages(struct list_head *l, struct list_head *t,
+	struct list_head *moved, struct list_head *failed) { return -ENOSYS; }
 #endif
 
 #ifdef CONFIG_MMU