From c6ced22997ad56a05377221bded7bb30973a62f2 Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (Google)" Date: Tue, 25 Jan 2022 10:44:08 -0500 Subject: tracing: Update print fmt check to handle new __get_sockaddr() macro A helper macro was added to make reading socket addresses easier in trace events. It pairs %pISpc with __get_sockaddr() that reads the socket address from the ring buffer into a human readable format. The boot up check that makes sure that trace events do not reference pointers to memory that can later be freed when the trace event is read, incorrectly flagged this as a delayed reference. Update the check to handle "__get_sockaddr" and not report an error on it. Link: https://lore.kernel.org/all/20220125160505.068dbb52@canb.auug.org.au/ Reported-by: Stephen Rothwell Signed-off-by: Steven Rostedt (Google) Signed-off-by: Chuck Lever --- kernel/trace/trace_events.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'kernel') diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 3147614c1812..f527ae807e77 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -384,6 +384,12 @@ static void test_event_printk(struct trace_event_call *call) if (!(dereference_flags & (1ULL << arg))) goto next_arg; + /* Check for __get_sockaddr */; + if (str_has_prefix(fmt + i, "__get_sockaddr(")) { + dereference_flags &= ~(1ULL << arg); + goto next_arg; + } + /* Find the REC-> in the argument */ c = strchr(fmt + i, ','); r = strstr(fmt + i, "REC->"); -- cgit v1.2.3 From f49169c97fceb21ad6a0aaf671c50b0f520f15a5 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Wed, 16 Feb 2022 12:31:09 -0500 Subject: NFSD: Remove svc_serv_ops::svo_module struct svc_serv_ops is about to be removed. Neil Brown says: > I suspect svo_module can go as well - I don't think the thread is > ever the thing that primarily keeps a module active. A random sample of kthread_create() callers shows sunrpc is the only one that manages module reference count in this way. Suggested-by: Neil Brown Signed-off-by: Chuck Lever --- fs/lockd/svc.c | 4 +--- fs/nfs/callback.c | 7 ++----- fs/nfs/nfs4state.c | 1 - fs/nfsd/nfssvc.c | 3 --- include/linux/sunrpc/svc.h | 5 ----- kernel/module.c | 2 +- net/sunrpc/svc.c | 2 -- 7 files changed, 4 insertions(+), 20 deletions(-) (limited to 'kernel') diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c index c83ec4a375bc..bfde31124f3a 100644 --- a/fs/lockd/svc.c +++ b/fs/lockd/svc.c @@ -184,8 +184,7 @@ lockd(void *vrqstp) dprintk("lockd_down: service stopped\n"); svc_exit_thread(rqstp); - - module_put_and_kthread_exit(0); + return 0; } static int create_lockd_listener(struct svc_serv *serv, const char *name, @@ -352,7 +351,6 @@ static struct notifier_block lockd_inet6addr_notifier = { static const struct svc_serv_ops lockd_sv_ops = { .svo_function = lockd, - .svo_module = THIS_MODULE, }; static int lockd_get(void) diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c index c98c68513590..a494f9e7bd0a 100644 --- a/fs/nfs/callback.c +++ b/fs/nfs/callback.c @@ -17,7 +17,6 @@ #include #include #include -#include #include #include @@ -92,8 +91,8 @@ nfs4_callback_svc(void *vrqstp) continue; svc_process(rqstp); } + svc_exit_thread(rqstp); - module_put_and_kthread_exit(0); return 0; } @@ -136,8 +135,8 @@ nfs41_callback_svc(void *vrqstp) finish_wait(&serv->sv_cb_waitq, &wq); } } + svc_exit_thread(rqstp); - module_put_and_kthread_exit(0); return 0; } @@ -234,12 +233,10 @@ err_bind: static const struct svc_serv_ops nfs40_cb_sv_ops = { .svo_function = nfs4_callback_svc, - .svo_module = THIS_MODULE, }; #if defined(CONFIG_NFS_V4_1) static const struct svc_serv_ops nfs41_cb_sv_ops = { .svo_function = nfs41_callback_svc, - .svo_module = THIS_MODULE, }; static const struct svc_serv_ops *nfs4_cb_sv_ops[] = { diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index f5a62c0d999b..02a899e4390f 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -2697,6 +2697,5 @@ static int nfs4_run_state_manager(void *ptr) allow_signal(SIGKILL); nfs4_state_manager(clp); nfs_put_client(clp); - module_put_and_kthread_exit(0); return 0; } diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c index b92d272f4ba6..544187a8a22b 100644 --- a/fs/nfsd/nfssvc.c +++ b/fs/nfsd/nfssvc.c @@ -614,7 +614,6 @@ static int nfsd_get_default_max_blksize(void) static const struct svc_serv_ops nfsd_thread_sv_ops = { .svo_function = nfsd, - .svo_module = THIS_MODULE, }; void nfsd_shutdown_threads(struct net *net) @@ -1018,8 +1017,6 @@ out: msleep(20); } - /* Release module */ - module_put_and_kthread_exit(0); return 0; } diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index 5603158b2aa7..dfc9283f412f 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -57,11 +57,6 @@ struct svc_serv; struct svc_serv_ops { /* function for service threads to run */ int (*svo_function)(void *); - - /* optional module to count when adding threads. - * Thread function must call module_put_and_kthread_exit() to exit. - */ - struct module *svo_module; }; /* diff --git a/kernel/module.c b/kernel/module.c index 46a5c2ed1928..6cea788fd965 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -335,7 +335,7 @@ static inline void add_taint_module(struct module *mod, unsigned flag, /* * A thread that wants to hold a reference to a module only while it - * is running can call this to safely exit. nfsd and lockd use this. + * is running can call this to safely exit. */ void __noreturn __module_put_and_kthread_exit(struct module *mod, long code) { diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index 08d684746452..a90d555aa163 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -736,11 +736,9 @@ svc_start_kthreads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) if (IS_ERR(rqstp)) return PTR_ERR(rqstp); - __module_get(serv->sv_ops->svo_module); task = kthread_create_on_node(serv->sv_ops->svo_function, rqstp, node, "%s", serv->sv_name); if (IS_ERR(task)) { - module_put(serv->sv_ops->svo_module); svc_exit_thread(rqstp); return PTR_ERR(task); } -- cgit v1.2.3