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Breno Leitao 97b03277ce Documentation: document panic_on_unrecoverable_memory_failure sysctl

Add documentation for the new vm.panic_on_unrecoverable_memory_failure
sysctl, describing which failures trigger a panic (kernel-owned pages the
handler cannot recover) and which are intentionally left out (transient
allocator races and unclassified pages).

Link: https://lore.kernel.org/20260630-ecc_panic-v10-5-c6ed5b62eea2@debian.org
Signed-off-by: Breno Leitao <leitao@debian.org>
Acked-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>