* [PATCH v22 26/31] trace: Convert trace/seq to use copy_splice_read()
[not found] <20230522135018.2742245-1-dhowells@redhat.com>
@ 2023-05-22 13:50 ` David Howells
0 siblings, 0 replies; only message in thread
From: David Howells @ 2023-05-22 13:50 UTC (permalink / raw)
To: Jens Axboe, Al Viro, Christoph Hellwig
Cc: David Howells, Matthew Wilcox, Jan Kara, Jeff Layton,
David Hildenbrand, Jason Gunthorpe, Logan Gunthorpe, Hillf Danton,
Christian Brauner, Linus Torvalds, linux-fsdevel, linux-block,
linux-kernel, linux-mm, Christoph Hellwig, Steven Rostedt,
Masami Hiramatsu, linux-trace-kernel
For the splice from the trace seq buffer, just use copy_splice_read().
In the future, something better can probably be done by gifting pages from
seq->buf into the pipe, but that would require changing seq->buf into a
vmap over an array of pages.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Christoph Hellwig <hch@lst.de>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: Jens Axboe <axboe@kernel.dk>
cc: Steven Rostedt <rostedt@goodmis.org>
cc: Masami Hiramatsu <mhiramat@kernel.org>
cc: linux-kernel@vger.kernel.org
cc: linux-trace-kernel@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-block@vger.kernel.org
cc: linux-mm@kvack.org
---
kernel/trace/trace.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ebc59781456a..c210d02fac97 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5171,7 +5171,7 @@ static const struct file_operations tracing_fops = {
.open = tracing_open,
.read = seq_read,
.read_iter = seq_read_iter,
- .splice_read = generic_file_splice_read,
+ .splice_read = copy_splice_read,
.write = tracing_write_stub,
.llseek = tracing_lseek,
.release = tracing_release,
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