staging: zcache: enable ramster to be built/loaded as a module

Enable module support for ramster.  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.

Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
[v1: Fixed compile issues since ramster_init now has four arguments]
[v2: Fixed rebase on ramster->zcache move]
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>

diff --git a/drivers/staging/zcache/ramster.h b/drivers/staging/zcache/ramster.h
index 1b71aea2ff62be4062d532f380515c1875811bd5..e1f91d5a0f6a4d74f6f4864b85d16e134ae046a2 100644 (file)
--- a/drivers/staging/zcache/ramster.h
+++ b/drivers/staging/zcache/ramster.h
@@ -11,10 +11,14 @@
 #ifndef _ZCACHE_RAMSTER_H_
 #define _ZCACHE_RAMSTER_H_
 
+#ifdef CONFIG_RAMSTER_MODULE
+#define CONFIG_RAMSTER
+#endif
+
 #ifdef CONFIG_RAMSTER
 #include "ramster/ramster.h"
 #else
-static inline void ramster_init(bool x, bool y, bool z)
+static inline void ramster_init(bool x, bool y, bool z, bool w)
 {
 }
 

diff --git a/drivers/staging/zcache/ramster/nodemanager.c b/drivers/staging/zcache/ramster/nodemanager.c
index c0f48158735d54feca9ceec3222534e6772ea4ad..2cfe93342c0d6a6916acec16d28093f268040943 100644 (file)
--- a/drivers/staging/zcache/ramster/nodemanager.c
+++ b/drivers/staging/zcache/ramster/nodemanager.c
@@ -949,7 +949,7 @@ static void __exit exit_r2nm(void)
        r2hb_exit();
 }
 
-static int __init init_r2nm(void)
+int r2nm_init(void)
 {
        int ret = -1;
 
@@ -986,10 +986,11 @@ out_r2hb:
 out:
        return ret;
 }
+EXPORT_SYMBOL_GPL(r2nm_init);
 
 MODULE_AUTHOR("Oracle");
 MODULE_LICENSE("GPL");
 
-/* module_init(init_r2nm) */
-late_initcall(init_r2nm);
-/* module_exit(exit_r2nm) */
+#ifndef CONFIG_RAMSTER_MODULE
+late_initcall(r2nm_init);
+#endif

diff --git a/drivers/staging/zcache/ramster/ramster.c b/drivers/staging/zcache/ramster/ramster.c
index 01fc672399fe4b3a837eb3e7344b0cadc393e356..56175909108dd6c9196d532fecbb2d78419d21dd 100644 (file)
--- a/drivers/staging/zcache/ramster/ramster.c
+++ b/drivers/staging/zcache/ramster/ramster.c
@@ -92,7 +92,7 @@ static ssize_t ramster_remote_page_flushes_failed;
 #include <linux/debugfs.h>
 #define        zdfs    debugfs_create_size_t
 #define        zdfs64  debugfs_create_u64
-static int __init ramster_debugfs_init(void)
+static int ramster_debugfs_init(void)
 {
        struct dentry *root = debugfs_create_dir("ramster", NULL);
        if (root == NULL)
@@ -196,6 +196,7 @@ int ramster_do_preload_flnode(struct tmem_pool *pool)
                kmem_cache_free(ramster_flnode_cache, flnode);
        return ret;
 }
+EXPORT_SYMBOL_GPL(ramster_do_preload_flnode);
 
 /*
  * Called by the message handler after a (still compressed) page has been
@@ -463,6 +464,7 @@ void *ramster_pampd_free(void *pampd, struct tmem_pool *pool,
        }
        return local_pampd;
 }
+EXPORT_SYMBOL_GPL(ramster_pampd_free);
 
 void ramster_count_foreign_pages(bool eph, int count)
 {
@@ -494,6 +496,7 @@ void ramster_count_foreign_pages(bool eph, int count)
                ramster_foreign_pers_pages = c;
        }
 }
+EXPORT_SYMBOL_GPL(ramster_count_foreign_pages);
 
 /*
  * For now, just push over a few pages every few seconds to
@@ -679,7 +682,7 @@ requeue:
        ramster_remotify_queue_delayed_work(HZ);
 }
 
-void __init ramster_remotify_init(void)
+void ramster_remotify_init(void)
 {
        unsigned long n = 60UL;
        ramster_remotify_workqueue =
@@ -854,8 +857,10 @@ static bool frontswap_selfshrinking __read_mostly;
 static void selfshrink_process(struct work_struct *work);
 static DECLARE_DELAYED_WORK(selfshrink_worker, selfshrink_process);
 
+#ifndef CONFIG_RAMSTER_MODULE
 /* Enable/disable with kernel boot option. */
 static bool use_frontswap_selfshrink __initdata = true;
+#endif
 
 /*
  * The default values for the following parameters were deemed reasonable
@@ -910,6 +915,7 @@ static void frontswap_selfshrink(void)
        frontswap_shrink(tgt_frontswap_pages);
 }
 
+#ifndef CONFIG_RAMSTER_MODULE
 static int __init ramster_nofrontswap_selfshrink_setup(char *s)
 {
        use_frontswap_selfshrink = false;
@@ -917,6 +923,7 @@ static int __init ramster_nofrontswap_selfshrink_setup(char *s)
 }
 
 __setup("noselfshrink", ramster_nofrontswap_selfshrink_setup);
+#endif
 
 static void selfshrink_process(struct work_struct *work)
 {
@@ -935,6 +942,7 @@ void ramster_cpu_up(int cpu)
        per_cpu(ramster_remoteputmem1, cpu) = p1;
        per_cpu(ramster_remoteputmem2, cpu) = p2;
 }
+EXPORT_SYMBOL_GPL(ramster_cpu_up);
 
 void ramster_cpu_down(int cpu)
 {
@@ -950,6 +958,7 @@ void ramster_cpu_down(int cpu)
                kp->flnode = NULL;
        }
 }
+EXPORT_SYMBOL_GPL(ramster_cpu_down);
 
 void ramster_register_pamops(struct tmem_pamops *pamops)
 {
@@ -960,9 +969,11 @@ void ramster_register_pamops(struct tmem_pamops *pamops)
        pamops->repatriate = ramster_pampd_repatriate;
        pamops->repatriate_preload = ramster_pampd_repatriate_preload;
 }
+EXPORT_SYMBOL_GPL(ramster_register_pamops);
 
-void __init ramster_init(bool cleancache, bool frontswap,
-                               bool frontswap_exclusive_gets)
+void ramster_init(bool cleancache, bool frontswap,
+                               bool frontswap_exclusive_gets,
+                               bool frontswap_selfshrink)
 {
        int ret = 0;
 
@@ -977,10 +988,17 @@ void __init ramster_init(bool cleancache, bool frontswap,
        if (ret)
                pr_err("ramster: can't create sysfs for ramster\n");
        (void)r2net_register_handlers();
+#ifdef CONFIG_RAMSTER_MODULE
+       ret = r2nm_init();
+       if (ret)
+               pr_err("ramster: can't init r2net\n");
+       frontswap_selfshrinking = frontswap_selfshrink;
+#else
+       frontswap_selfshrinking = use_frontswap_selfshrink;
+#endif
        INIT_LIST_HEAD(&ramster_rem_op_list);
        ramster_flnode_cache = kmem_cache_create("ramster_flnode",
                                sizeof(struct flushlist_node), 0, 0, NULL);
-       frontswap_selfshrinking = use_frontswap_selfshrink;
        if (frontswap_selfshrinking) {
                pr_info("ramster: Initializing frontswap selfshrink driver.\n");
                schedule_delayed_work(&selfshrink_worker,
@@ -988,3 +1006,4 @@ void __init ramster_init(bool cleancache, bool frontswap,
        }
        ramster_remotify_init();
 }
+EXPORT_SYMBOL_GPL(ramster_init);

diff --git a/drivers/staging/zcache/ramster/ramster.h b/drivers/staging/zcache/ramster/ramster.h
index 12ae56f09ca4a1bb1948c0f6ea19b8f4f0e8a8cf..6d41a7a772e374966d198b4fd00ee20416e551fc 100644 (file)
--- a/drivers/staging/zcache/ramster/ramster.h
+++ b/drivers/staging/zcache/ramster/ramster.h
@@ -147,7 +147,7 @@ extern int r2net_register_handlers(void);
 extern int r2net_remote_target_node_set(int);
 
 extern int ramster_remotify_pageframe(bool);
-extern void ramster_init(bool, bool, bool);
+extern void ramster_init(bool, bool, bool, bool);
 extern void ramster_register_pamops(struct tmem_pamops *);
 extern int ramster_localify(int, struct tmem_oid *oidp, uint32_t, char *,
                                unsigned int, void *);

diff --git a/drivers/staging/zcache/ramster/ramster_nodemanager.h b/drivers/staging/zcache/ramster/ramster_nodemanager.h
index 49f879d943ab4238f6447cfc8a42a3330b9ff161..dbaae34ea61339ea26c9c90609a3dd741234eb5b 100644 (file)
--- a/drivers/staging/zcache/ramster/ramster_nodemanager.h
+++ b/drivers/staging/zcache/ramster/ramster_nodemanager.h
@@ -36,4 +36,6 @@
 /* host name, group name, cluster name all 64 bytes */
 #define R2NM_MAX_NAME_LEN        64    /* __NEW_UTS_LEN */
 
+extern int r2nm_init(void);
+
 #endif /* _RAMSTER_NODEMANAGER_H */

diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index 6841fbab5f5a4a9c409690b2a26d96a392df2a5d..185861f825ee278d5eb2ae9fb305a5e6fd7f0091 100644 (file)
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -1894,7 +1894,7 @@ static int __init zcache_init(void)
        }
        if (ramster_enabled)
                ramster_init(!disable_cleancache, !disable_frontswap,
-                               frontswap_has_exclusive_gets);
+                               frontswap_has_exclusive_gets, false);
 out:
        return ret;
 }