From 8f05189d126882b717dc4e61201e8d7a954db64f Mon Sep 17 00:00:00 2001 From: Dan Magenheimer Date: Wed, 27 Mar 2013 10:24:20 +1100 Subject: [PATCH] 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 [v1: Fixed compile issues since ramster_init now has four arguments] [v2: Fixed rebase on ramster->zcache move] Signed-off-by: Konrad Rzeszutek Wilk Signed-off-by: Bob Liu Cc: Wanpeng Li Cc: Andor Daam Cc: Florian Schmaus Cc: Minchan Kim Cc: Stefan Hengelein Signed-off-by: Andrew Morton --- drivers/staging/zcache/ramster.h | 6 +++- drivers/staging/zcache/ramster/nodemanager.c | 9 +++--- drivers/staging/zcache/ramster/ramster.c | 29 +++++++++++++++---- drivers/staging/zcache/ramster/ramster.h | 2 +- .../zcache/ramster/ramster_nodemanager.h | 2 ++ drivers/staging/zcache/zcache-main.c | 2 +- 6 files changed, 38 insertions(+), 12 deletions(-) diff --git a/drivers/staging/zcache/ramster.h b/drivers/staging/zcache/ramster.h index 1b71aea2ff62..e1f91d5a0f6a 100644 --- 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 c0f48158735d..2cfe93342c0d 100644 --- 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 01fc672399fe..56175909108d 100644 --- 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 #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 12ae56f09ca4..6d41a7a772e3 100644 --- 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 49f879d943ab..dbaae34ea613 100644 --- 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 6841fbab5f5a..185861f825ee 100644 --- 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; } -- 2.39.5