/* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static struct ax25_protocol *protocol_list; static DEFINE_RWLOCK(protocol_list_lock); static HLIST_HEAD(ax25_linkfail_list); static DEFINE_SPINLOCK(linkfail_lock); static struct listen_struct { struct listen_struct *next; ax25_address callsign; struct net_device *dev; } *listen_list = NULL; static DEFINE_SPINLOCK(listen_lock); /* * Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT, * AX25_P_IP or AX25_P_ARP ... */ void ax25_register_pid(struct ax25_protocol *ap) { write_lock_bh(&protocol_list_lock); ap->next = protocol_list; protocol_list = ap; write_unlock_bh(&protocol_list_lock); } EXPORT_SYMBOL_GPL(ax25_register_pid); void ax25_protocol_release(unsigned int pid) { struct ax25_protocol *protocol; write_lock_bh(&protocol_list_lock); protocol = protocol_list; if (protocol == NULL) goto out; if (protocol->pid == pid) { protocol_list = protocol->next; goto out; } while (protocol != NULL && protocol->next != NULL) { if (protocol->next->pid == pid) { protocol->next = protocol->next->next; goto out; } protocol = protocol->next; } out: write_unlock_bh(&protocol_list_lock); } EXPORT_SYMBOL(ax25_protocol_release); void ax25_linkfail_register(struct ax25_linkfail *lf) { spin_lock_bh(&linkfail_lock); hlist_add_head(&lf->lf_node, &ax25_linkfail_list); spin_unlock_bh(&linkfail_lock); } EXPORT_SYMBOL(ax25_linkfail_register); void ax25_linkfail_release(struct ax25_linkfail *lf) { spin_lock_bh(&linkfail_lock); hlist_del_init(&lf->lf_node); spin_unlock_bh(&linkfail_lock); } EXPORT_SYMBOL(ax25_linkfail_release); int ax25_listen_register(ax25_address *callsign, struct net_device *dev) { struct listen_struct *listen; if (ax25_listen_mine(callsign, dev)) return 0; if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL) return -ENOMEM; listen->callsign = *callsign; listen->dev = dev; spin_lock_bh(&listen_lock); listen->next = listen_list; listen_list = listen; spin_unlock_bh(&listen_lock); return 0; } EXPORT_SYMBOL(ax25_listen_register); void ax25_listen_release(ax25_address *callsign, struct net_device *dev) { struct listen_struct *s, *listen; spin_lock_bh(&listen_lock); listen = listen_list; if (listen == NULL) { spin_unlock_bh(&listen_lock); return; } if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) { listen_list = listen->next; spin_unlock_bh(&listen_lock); kfree(listen); return; } while (listen != NULL && listen->next != NULL) { if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) { s = listen->next; listen->next = listen->next->next; spin_unlock_bh(&listen_lock); kfree(s); return; } listen = listen->next; } spin_unlock_bh(&listen_lock); } EXPORT_SYMBOL(ax25_listen_release); int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *) { int (*res)(struct sk_buff *, ax25_cb *) = NULL; struct ax25_protocol *protocol; read_lock(&protocol_list_lock); for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) if (protocol->pid == pid) { res = protocol->func; break; } read_unlock(&protocol_list_lock); return res; } int ax25_listen_mine(ax25_address *callsign, struct net_device *dev) { struct listen_struct *listen; spin_lock_bh(&listen_lock); for (listen = listen_list; listen != NULL; listen = listen->next) if (ax25cmp(&listen->callsign, callsign) == 0 && (listen->dev == dev || listen->dev == NULL)) { spin_unlock_bh(&listen_lock); return 1; } spin_unlock_bh(&listen_lock); return 0; } void ax25_link_failed(ax25_cb *ax25, int reason) { struct ax25_linkfail *lf; spin_lock_bh(&linkfail_lock); hlist_for_each_entry(lf, &ax25_linkfail_list, lf_node) lf->func(ax25, reason); spin_unlock_bh(&linkfail_lock); } int ax25_protocol_is_registered(unsigned int pid) { struct ax25_protocol *protocol; int res = 0; read_lock_bh(&protocol_list_lock); for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) if (protocol->pid == pid) { res = 1; break; } read_unlock_bh(&protocol_list_lock); return res; } 48c421a4ca76468 (patch) tree55703c2ea8584e303e342090614e0aab3509ab21 /net/dns_resolver/dns_key.c parent0b3589be9b98994ce3d5aeca52445d1f5627c4ba (diff)
perf/x86/intel/rapl: Make package handling more robust
The package management code in RAPL relies on package mapping being available before a CPU is started. This changed with: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") because the ACPI/BIOS information turned out to be unreliable, but that left RAPL in broken state. This was not noticed because on a regular boot all CPUs are online before RAPL is initialized. A possible fix would be to reintroduce the mess which allocates a package data structure in CPU prepare and when it turns out to already exist in starting throw it away later in the CPU online callback. But that's a horrible hack and not required at all because RAPL becomes functional for perf only in the CPU online callback. That's correct because user space is not yet informed about the CPU being onlined, so nothing caan rely on RAPL being available on that particular CPU. Move the allocation to the CPU online callback and simplify the hotplug handling. At this point the package mapping is established and correct. This also adds a missing check for available package data in the event_init() function. Reported-by: Yasuaki Ishimatsu <yasu.isimatu@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Stephane Eranian <eranian@google.com> Cc: Vince Weaver <vincent.weaver@maine.edu> Fixes: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") Link: http://lkml.kernel.org/r/20170131230141.212593966@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/dns_resolver/dns_key.c')