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>

path: root/include/net/rawv6.h

#ifndef _NET_RAWV6_H
#define _NET_RAWV6_H

#include <net/protocol.h>

extern struct raw_hashinfo raw_v6_hashinfo;
struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
			     unsigned short num, const struct in6_addr *loc_addr,
			     const struct in6_addr *rmt_addr, int dif);

int raw_abort(struct sock *sk, int err);

void raw6_icmp_error(struct sk_buff *, int nexthdr,
		u8 type, u8 code, int inner_offset, __be32);
bool raw6_local_deliver(struct sk_buff *, int);

int rawv6_rcv(struct sock *sk, struct sk_buff *skb);

#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
int rawv6_mh_filter_register(int (*filter)(struct sock *sock,
					   struct sk_buff *skb));
int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock,
					     struct sk_buff *skb));
#endif

#endif