tracing/remotes: Account for ring buffer page header in size calculation

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trace_buffer_desc_size() and trace_remote_alloc_buffer() undercount the
required pages because every ring buffer page contains a header
(BUF_PAGE_HDR_SIZE). Account for that header to ensure allocated remote
ring buffers aren't smaller than requested by the user.

The newly introduced helper __calc_nr_pages_ring_buffer_desc() can
return a value that overflows the descriptor nr_pages field (32 bits).

Link: https://patch.msgid.link/20260911193937.602202-2-vdonnefort@google.com
Fixes: 2e67fabd8b ("ring-buffer: Introduce ring-buffer remotes")
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Vincent Donnefort 2026-09-11 20:39:35 +01:00 • committed by Steven Rostedt

parent bcfe2816e6

commit 442ffa742d

2 changed files with 14 additions and 3 deletions

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15

include/linux/ring_buffer.h

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2

kernel/trace/trace_remote.c

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