linux-kernel - [PATCH v6 2/7] perf/core: Export AUX buffer helpers to modules

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Message-Id: <1507811438-2267-3-git-send-email-will.deacon@arm.com>
Date:   Thu, 12 Oct 2017 13:30:33 +0100
From:   Will Deacon <will.deacon@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     marc.zyngier@....com, mark.rutland@....com, kim.phillips@....com,
        tglx@...utronix.de, peterz@...radead.org,
        alexander.shishkin@...ux.intel.com, robh@...nel.org,
        suzuki.poulose@....com, pawel.moll@....com,
        mathieu.poirier@...aro.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>
Subject: [PATCH v6 2/7] 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@...radead.org>
Signed-off-by: Will Deacon <will.deacon@....com>
---
 kernel/events/ring_buffer.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index f684d8e5fa2b..6d9bffe4d6cc 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -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)
 
-- 
2.1.4