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| author | Steven Rostedt <rostedt@goodmis.org> | 2025-03-05 19:45:42 +0300 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2025-03-28 15:39:27 +0300 |
| commit | 4af0a9c518522892b36cb7ecedf0c6004dc0a581 (patch) | |
| tree | 4d3c41b69f0d1cd11c5c69453b2dd93f9f9b4570 /include/linux/ring_buffer.h | |
| parent | 4009cc31e7813ed66a04237ddff76706ff57a771 (diff) | |
| download | linux-4af0a9c518522892b36cb7ecedf0c6004dc0a581.tar.xz | |
ring-buffer: Add ring_buffer_meta_scratch()
Now that there's one meta data at the start of the persistent memory used by
the ring buffer, allow the caller to request some memory right after that
data that it can use as its own persistent memory.
Also fix some white space issues with ring_buffer_alloc().
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/20250305164608.619631731@goodmis.org
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ring_buffer.h')
| -rw-r--r-- | include/linux/ring_buffer.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h index 8de035f4f0d9..019b59a0bbc9 100644 --- a/include/linux/ring_buffer.h +++ b/include/linux/ring_buffer.h @@ -92,9 +92,11 @@ __ring_buffer_alloc(unsigned long size, unsigned flags, struct lock_class_key *k struct trace_buffer *__ring_buffer_alloc_range(unsigned long size, unsigned flags, int order, unsigned long start, unsigned long range_size, + unsigned long scratch_size, struct lock_class_key *key); bool ring_buffer_last_boot_delta(struct trace_buffer *buffer, unsigned long *kaslr_addr); +void *ring_buffer_meta_scratch(struct trace_buffer *buffer, unsigned int *size); /* * Because the ring buffer is generic, if other users of the ring buffer get @@ -112,11 +114,11 @@ bool ring_buffer_last_boot_delta(struct trace_buffer *buffer, unsigned long *kas * traced by ftrace, it can produce lockdep warnings. We need to keep each * ring buffer's lock class separate. */ -#define ring_buffer_alloc_range(size, flags, order, start, range_size) \ +#define ring_buffer_alloc_range(size, flags, order, start, range_size, s_size) \ ({ \ static struct lock_class_key __key; \ __ring_buffer_alloc_range((size), (flags), (order), (start), \ - (range_size), &__key); \ + (range_size), (s_size), &__key); \ }) typedef bool (*ring_buffer_cond_fn)(void *data); |