diff options
author | James Morris <james.morris@microsoft.com> | 2018-09-04 11:35:54 -0700 |
---|---|---|
committer | James Morris <james.morris@microsoft.com> | 2018-09-04 11:35:54 -0700 |
commit | e42f6f9be4f83c537aa81b4c6239ea94ff5b29ce (patch) | |
tree | f956a5ea0e83fc6d0df3e64681e7bbc1f201f3ee /kernel/trace/ring_buffer.c | |
parent | 4408e300a67ab2ce2505087986a9fe922c800ffd (diff) | |
parent | 57361846b52bc686112da6ca5368d11210796804 (diff) |
Merge tag 'v4.19-rc2' into next-general
Sync to Linux 4.19-rc2 for downstream developers.
Diffstat (limited to 'kernel/trace/ring_buffer.c')
-rw-r--r-- | kernel/trace/ring_buffer.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 6a46af21765c..1d92d4a982fd 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Generic ring buffer * @@ -3221,12 +3222,28 @@ EXPORT_SYMBOL_GPL(ring_buffer_record_on); * * Returns true if the ring buffer is in a state that it accepts writes. */ -int ring_buffer_record_is_on(struct ring_buffer *buffer) +bool ring_buffer_record_is_on(struct ring_buffer *buffer) { return !atomic_read(&buffer->record_disabled); } /** + * ring_buffer_record_is_set_on - return true if the ring buffer is set writable + * @buffer: The ring buffer to see if write is set enabled + * + * Returns true if the ring buffer is set writable by ring_buffer_record_on(). + * Note that this does NOT mean it is in a writable state. + * + * It may return true when the ring buffer has been disabled by + * ring_buffer_record_disable(), as that is a temporary disabling of + * the ring buffer. + */ +bool ring_buffer_record_is_set_on(struct ring_buffer *buffer) +{ + return !(atomic_read(&buffer->record_disabled) & RB_BUFFER_OFF); +} + +/** * ring_buffer_record_disable_cpu - stop all writes into the cpu_buffer * @buffer: The ring buffer to stop writes to. * @cpu: The CPU buffer to stop |