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Commit bc1d2020 authored by Will Deacon's avatar Will Deacon
Browse files

perf/core: Export AUX buffer helpers to modules 



Perf PMU drivers using AUX buffers cannot be built as modules unless
the AUX helpers are exported.

This patch exports perf_aux_output_{begin,end,skip} and perf_get_aux to
modules.

Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 5ffeb050

kernel/events/ring_buffer.c

+4 −0
Original line number Diff line number Diff line
@@ -411,6 +411,7 @@ void *perf_aux_output_begin(struct perf_output_handle *handle, 


	return NULL;

}

EXPORT_SYMBOL_GPL(perf_aux_output_begin);



static bool __always_inline rb_need_aux_wakeup(struct ring_buffer *rb)

{
@@ -480,6 +481,7 @@ void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size) 
	rb_free_aux(rb);

	ring_buffer_put(rb);

}

EXPORT_SYMBOL_GPL(perf_aux_output_end);



/*

 * Skip over a given number of bytes in the AUX buffer, due to, for example,
@@ -505,6 +507,7 @@ int perf_aux_output_skip(struct perf_output_handle *handle, unsigned long size) 


	return 0;

}

EXPORT_SYMBOL_GPL(perf_aux_output_skip);



void *perf_get_aux(struct perf_output_handle *handle)

{
@@ -514,6 +517,7 @@ void *perf_get_aux(struct perf_output_handle *handle) 


	return handle->rb->aux_priv;

}

EXPORT_SYMBOL_GPL(perf_get_aux);



#define PERF_AUX_GFP	(GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY)