ring-buffer: Cap static ring buffer nr_pages

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Static ring buffers (i.e. persistent, user-mapped and remote) rely on
the bpage::id field. The number of pages for those ring buffers must fit
into that variable. Enforce this limit on ring buffer creation or
user-mapping.

While at it, prevent nr_pages underflow when allocating a persistent
buffer.

Link: https://patch.msgid.link/20260904164450.1345852-4-vdonnefort@google.com
Fixes: be68d63a13 ("ring-buffer: Add ring_buffer_alloc_range()")
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Vincent Donnefort 2026-09-04 17:44:49 +01:00 • committed by Steven Rostedt

parent dae8dda341

commit f2b2b64559

1 changed files with 22 additions and 0 deletions

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kernel/trace/ring_buffer.c

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