linux-kernel - [PATCH 1/4] perf: Export AUX buffer helpers to modules

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Message-Id: <20170220133352.17995-2-alexander.shishkin@linux.intel.com>
Date:   Mon, 20 Feb 2017 15:33:49 +0200
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...hat.com>
Cc:     linux-kernel@...r.kernel.org, vince@...ter.net, eranian@...gle.com,
        Arnaldo Carvalho de Melo <acme@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH 1/4] perf: Export AUX buffer helpers to modules

From: Will Deacon <will.deacon@....com>

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>
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.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 257fa460b8..6415807169 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -397,6 +397,7 @@ void *perf_aux_output_begin(struct perf_output_handle *handle,
 
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(perf_aux_output_begin);
 
 /*
  * Commit the data written by hardware into the ring buffer by adjusting
@@ -458,6 +459,7 @@ 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,
@@ -486,6 +488,7 @@ 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)
 {
@@ -495,6 +498,7 @@ 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)
 
-- 
2.11.0