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d594d8f411
-----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEESH4wyp42V4tXvYsjUqAMR0iAlPIFAl+EN+oACgkQUqAMR0iA lPK/gA//WXBjC4FSPNr0j7kPFKQhADS3cUcp+GfuI4rYkYcJHV0yJn1kvctg1rUC Je+Hc+Hy5Nk93lwejj5BvQoc31zOeoPDyMje5zi5te4H2NQkaoGXHOMvUnaLcNeo g+HJvx+NU9MDjuc5amtK8YD69jzErD+eqrHpQOg4UToMXXcBXLafTThIi9vT1fzP 9uwWBRlpdQyY7tYbbwFiDuu33PyoWlc6Ksp8qKdLBLz2AmGd1Rvaq+ePsq8b9tHJ pfv1agW0GTpzoN2pm5gFXOoYniHB/ooB1L0QLq7ylaociEyb8WbTtkn4v++EjxW8 aGsO1WdO0MQeIWDxXQR5DYD3s+Me2DMhFPDqUc2/s0q2SGWUPFcsmCsvMAOx/clA HDfTWkyzB4FarZOTv0gZ7jYNOVukFzUQ1IBTtWpJifC9fT0xrRkKmKE1UgmWv0ei Hx5VFQyQGsDh3sUcRLhW91p4sqJCs7l01zw1A/0rb7a+QTHAqZRtbz5hyTjlViiT 57XiyXynXW8N4Q5U6uAxCbkFFi+nP/XVQ5ggZ/QLn/4hfWWUcu0vt2bOGkRwryAT zYmDqViraEVWKIom74UzZ0nrIBtdhvtbFQIYuyiCQKpKMwytWXUQbUASZL2mfBZi h5eJx7etV6f5to5mNRsj8bbN5buX9UheEd0QFD9NJdS6aadqTac= =9vEl -----END PGP SIGNATURE----- Merge tag 'printk-for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux Pull printk updates from Petr Mladek: "The big new thing is the fully lockless ringbuffer implementation, including the support for continuous lines. It will allow to store and read messages in any situation wihtout the risk of deadlocks and without the need of temporary per-CPU buffers. The access is still serialized by logbuf_lock. It synchronizes few more operations, for example, temporary buffer for formatting the message, syslog and kmsg_dump operations. The lock removal is being discussed and should be ready for the next release. The continuous lines are handled exactly the same way as before to avoid regressions in user space. It means that they are appended to the last message when the caller is the same. Only the last message can be extended. The data ring includes plain text of the messages. Except for an integer at the beginning of each message that points back to the descriptor ring with other metadata. The dictionary has to stay. journalctl uses it to filter the log. It allows to show messages related to a given device. The dictionary values are stored in the descriptor ring with the other metadata. This is the first part of the printk rework as discussed at Plumbers 2019, see https://lore.kernel.org/r/87k1acz5rx.fsf@linutronix.de. The next big step will be handling consoles by kthreads during the normal system operation. It will require special handling of situations when the kthreads could not get scheduled, for example, early boot, suspend, panic. Other changes: - Add John Ogness as a reviewer for printk subsystem. He is author of the rework and is familiar with the code and history. - Fix locking in serial8250_do_startup() to prevent lockdep report. - Few code cleanups" * tag 'printk-for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux: (27 commits) printk: Use fallthrough pseudo-keyword printk: reduce setup_text_buf size to LOG_LINE_MAX printk: avoid and/or handle record truncation printk: remove dict ring printk: move dictionary keys to dev_printk_info printk: move printk_info into separate array printk: reimplement log_cont using record extension printk: ringbuffer: add finalization/extension support printk: ringbuffer: change representation of states printk: ringbuffer: clear initial reserved fields printk: ringbuffer: add BLK_DATALESS() macro printk: ringbuffer: relocate get_data() printk: ringbuffer: avoid memcpy() on state_var printk: ringbuffer: fix setting state in desc_read() kernel.h: Move oops_in_progress to printk.h scripts/gdb: update for lockless printk ringbuffer scripts/gdb: add utils.read_ulong() docs: vmcoreinfo: add lockless printk ringbuffer vmcoreinfo printk: reduce LOG_BUF_SHIFT range for H8300 printk: ringbuffer: support dataless records ... |
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