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authorDan Magenheimer <dan.magenheimer@oracle.com>2013-04-30 15:27:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 17:04:01 -0700
commit10a7a0771399a57a297fca9615450dbb3f88081a (patch)
tree7c8564daf7ce2698277a4a38edb9ef0f636cb429 /include/xen
parentff610a1d55da22bf95bbc6a8b193e052169b34b7 (diff)
downloadop-kernel-dev-10a7a0771399a57a297fca9615450dbb3f88081a.zip
op-kernel-dev-10a7a0771399a57a297fca9615450dbb3f88081a.tar.gz
xen: tmem: enable Xen tmem shim to be built/loaded as a module
Allow Xen tmem shim to be built/loaded as a module. Xen self-ballooning and frontswap-selfshrinking are now also "lazily" initialized when the Xen tmem shim is loaded as a module, unless explicitly disabled by module parameters. Note runtime dependency disallows loading if cleancache/frontswap lazy initialization patches are not present. If built-in (not built as a module), the original mechanism of enabling via a kernel boot parameter is retained, but this should be considered deprecated. Note that module unload is explicitly not yet supported. [v1: Removed the [CLEANCACHE|FRONTSWAP]_HAS_LAZY_INIT ifdef] [v2: Squashed the xen/tmem: Remove the subsys call patch in] [akpm@linux-foundation.org: fix build (disable_frontswap_selfshrinking undeclared)] Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Bob Liu <lliubbo@gmail.com> Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com> Cc: Andor Daam <andor.daam@googlemail.com> Cc: Florian Schmaus <fschmaus@gmail.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Stefan Hengelein <ilendir@googlemail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/xen')
-rw-r--r--include/xen/tmem.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/xen/tmem.h b/include/xen/tmem.h
index 591550a..3930a90 100644
--- a/include/xen/tmem.h
+++ b/include/xen/tmem.h
@@ -3,7 +3,15 @@
#include <linux/types.h>
+#ifdef CONFIG_XEN_TMEM_MODULE
+#define tmem_enabled true
+#else
/* defined in drivers/xen/tmem.c */
extern bool tmem_enabled;
+#endif
+
+#ifdef CONFIG_XEN_SELFBALLOONING
+extern int xen_selfballoon_init(bool, bool);
+#endif
#endif /* _XEN_TMEM_H */
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