ring-buffer: Allow splice reads on static buffers

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ring_buffer_read_page() rejects splice (full=1) reads on static buffers
(that is user-mapped, persistent or remote) because !read check assumes
unread pages must be swapped. However for those buffers we have no other
choice than memcpy the data.

For the memcpy case, only return an error when the writer is still on
the reader page for the splice interface to wait.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260901155445.1475405-2-vdonnefort@google.com
Fixes: 117c39200d ("ring-buffer: Introducing ring-buffer mapping functions")
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Vincent Donnefort 2026-09-01 16:54:42 +01:00 • committed by Steven Rostedt

parent f2951ebd15

commit 6365c44a82

1 changed files with 2 additions and 9 deletions

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kernel/trace/ring_buffer.c

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