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authorSean Christopherson <seanjc@google.com>2021-11-11 02:07:29 +0000
committerPeter Zijlstra <peterz@infradead.org>2021-11-17 14:49:08 +0100
commit2aef6f306b39bbe74e2287d6e2ee07c4867d87d0 (patch)
tree53b56630ba56b3f246289fdcd12096f10b5bf921 /kernel/events
parent1c3430516b0732d923de9fd3bfb3e2e537eeb235 (diff)
downloadlinux-2aef6f306b39bbe74e2287d6e2ee07c4867d87d0.tar.bz2
perf: Force architectures to opt-in to guest callbacks
Introduce GUEST_PERF_EVENTS and require architectures to select it to allow registering and using guest callbacks in perf. This will hopefully make it more difficult for new architectures to add useless "support" for guest callbacks, e.g. via copy+paste. Stubbing out the helpers has the happy bonus of avoiding a load of perf_guest_cbs when GUEST_PERF_EVENTS=n on arm64/x86. Signed-off-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Link: https://lore.kernel.org/r/20211111020738.2512932-9-seanjc@google.com
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/core.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 17e5b20762c5..5a3502cd5362 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6521,6 +6521,7 @@ static void perf_pending_event(struct irq_work *entry)
perf_swevent_put_recursion_context(rctx);
}
+#ifdef CONFIG_GUEST_PERF_EVENTS
struct perf_guest_info_callbacks __rcu *perf_guest_cbs;
void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs)
@@ -6541,6 +6542,7 @@ void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs)
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks);
+#endif
static void
perf_output_sample_regs(struct perf_output_handle *handle,