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relay: add buffer-only channels; useful for early logging
Allows one to create and use a channel with no associated files. Files can be initialized later. This is useful in scenarios such as logging in early code, before VFS is up. Therefore, such channels can be created and used as soon as kmem_cache_init() completed. This is needed by kmemtrace to do tracing in early kernel code. [[email protected]: build fix] Signed-off-by: Eduard - Gabriel Munteanu <[email protected]> Cc: Tom Zanussi <[email protected]> Signed-off-by: KOSAKI Motohiro <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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