locking/static_keys: Improve uninitialized key warning
Right now it says: static_key_disable_cpuslocked used before call to jump_label_init ------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:161 static_key_disable_cpuslocked+0x68/0x70 Modules linked in: CPU: 0 PID: 0 Comm: swapper Not tainted 4.14.0-rc5+ #1 Hardware name: SGI.COM C2112-4GP3/X10DRT-P-Series, BIOS 2.0a 05/09/2016 task: ffffffff81c0e480 task.stack: ffffffff81c00000 RIP: 0010:static_key_disable_cpuslocked+0x68/0x70 RSP: 0000:ffffffff81c03ef0 EFLAGS: 00010096 ORIG_RAX: 0000000000000000 RAX: 0000000000000041 RBX: ffffffff81c32680 RCX: ffffffff81c5cbf8 RDX: 0000000000000001 RSI: 0000000000000092 RDI: 0000000000000002 RBP: ffff88807fffd240 R08: 726f666562206465 R09: 0000000000000136 R10: 0000000000000000 R11: 696e695f6c656261 R12: ffffffff82158900 R13: ffffffff8215f760 R14: 0000000000000001 R15: 0000000000000008 FS: 0000000000000000(0000) GS:ffff883f7f400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88807ffff000 CR3: 0000000001c09000 CR4: 00000000000606b0 Call Trace: static_key_disable+0x16/0x20 start_kernel+0x15a/0x45d ? load_ucode_intel_bsp+0x11/0x2d secondary_startup_64+0xa5/0xb0 Code: 48 c7 c7 a0 15 cf 81 e9 47 53 4b 00 48 89 df e8 5f fc ff ff eb e8 48 c7 c6 \ c0 97 83 81 48 c7 c7 d0 ff a2 81 31 c0 e8 c5 9d f5 ff <0f> ff eb a7 0f ff eb \ b0 e8 eb a2 4b 00 53 48 89 fb e8 42 0e f0 but it doesn't tell me which key it is. So dump the key's name too: static_key_disable_cpuslocked(): static key 'virt_spin_lock_key' used before call to jump_label_init() And that makes pinpointing which key is causing that a lot easier. include/linux/jump_label.h | 14 +++++++------- include/linux/jump_label_ratelimit.h | 6 +++--- kernel/jump_label.c | 14 +++++++------- 3 files changed, 17 insertions(+), 17 deletions(-) Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Hannes Frederic Sowa <hannes@stressinduktion.org> Cc: Jason Baron <jbaron@akamai.com> Cc: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20171018152428.ffjgak4o25f7ept6@pd.tnic Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -81,9 +81,9 @@
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extern bool static_key_initialized;
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#define STATIC_KEY_CHECK_USE() WARN(!static_key_initialized, \
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"%s used before call to jump_label_init", \
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__func__)
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#define STATIC_KEY_CHECK_USE(key) WARN(!static_key_initialized, \
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"%s(): static key '%pS' used before call to jump_label_init()", \
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__func__, (key))
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#ifdef HAVE_JUMP_LABEL
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@ -211,13 +211,13 @@ static __always_inline bool static_key_true(struct static_key *key)
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static inline void static_key_slow_inc(struct static_key *key)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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atomic_inc(&key->enabled);
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}
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static inline void static_key_slow_dec(struct static_key *key)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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atomic_dec(&key->enabled);
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}
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@ -236,7 +236,7 @@ static inline int jump_label_apply_nops(struct module *mod)
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static inline void static_key_enable(struct static_key *key)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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if (atomic_read(&key->enabled) != 0) {
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WARN_ON_ONCE(atomic_read(&key->enabled) != 1);
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@ -247,7 +247,7 @@ static inline void static_key_enable(struct static_key *key)
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static inline void static_key_disable(struct static_key *key)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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if (atomic_read(&key->enabled) != 1) {
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WARN_ON_ONCE(atomic_read(&key->enabled) != 0);
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@ -24,18 +24,18 @@ struct static_key_deferred {
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};
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static inline void static_key_slow_dec_deferred(struct static_key_deferred *key)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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static_key_slow_dec(&key->key);
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}
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static inline void static_key_deferred_flush(struct static_key_deferred *key)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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}
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static inline void
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jump_label_rate_limit(struct static_key_deferred *key,
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unsigned long rl)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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}
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#endif /* HAVE_JUMP_LABEL */
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#endif /* _LINUX_JUMP_LABEL_RATELIMIT_H */
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@ -83,7 +83,7 @@ static void static_key_slow_inc_cpuslocked(struct static_key *key)
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{
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int v, v1;
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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/*
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* Careful if we get concurrent static_key_slow_inc() calls;
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@ -128,7 +128,7 @@ EXPORT_SYMBOL_GPL(static_key_slow_inc);
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void static_key_enable_cpuslocked(struct static_key *key)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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if (atomic_read(&key->enabled) > 0) {
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WARN_ON_ONCE(atomic_read(&key->enabled) != 1);
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@ -158,7 +158,7 @@ EXPORT_SYMBOL_GPL(static_key_enable);
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void static_key_disable_cpuslocked(struct static_key *key)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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if (atomic_read(&key->enabled) != 1) {
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WARN_ON_ONCE(atomic_read(&key->enabled) != 0);
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@ -224,21 +224,21 @@ static void jump_label_update_timeout(struct work_struct *work)
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void static_key_slow_dec(struct static_key *key)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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__static_key_slow_dec(key, 0, NULL);
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}
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EXPORT_SYMBOL_GPL(static_key_slow_dec);
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void static_key_slow_dec_deferred(struct static_key_deferred *key)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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__static_key_slow_dec(&key->key, key->timeout, &key->work);
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}
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EXPORT_SYMBOL_GPL(static_key_slow_dec_deferred);
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void static_key_deferred_flush(struct static_key_deferred *key)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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flush_delayed_work(&key->work);
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}
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EXPORT_SYMBOL_GPL(static_key_deferred_flush);
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@ -246,7 +246,7 @@ EXPORT_SYMBOL_GPL(static_key_deferred_flush);
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void jump_label_rate_limit(struct static_key_deferred *key,
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unsigned long rl)
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{
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STATIC_KEY_CHECK_USE();
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STATIC_KEY_CHECK_USE(key);
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key->timeout = rl;
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INIT_DELAYED_WORK(&key->work, jump_label_update_timeout);
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}
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