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authorLinus Torvalds <torvalds@linux-foundation.org>2024-03-13 04:54:50 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2024-03-13 04:54:50 +0100
commitb0546776ad3f332e215cebc0b063ba4351971cca (patch)
treefb1d420fc3cc7073162ff1dccfc04884dd31a9f2 /drivers
parentmm, slab: remove last vestiges of SLAB_MEM_SPREAD (diff)
parentdump_stack: Do not get cpu_sync for panic CPU (diff)
downloadlinux-b0546776ad3f332e215cebc0b063ba4351971cca.tar.xz
linux-b0546776ad3f332e215cebc0b063ba4351971cca.zip
Merge tag 'printk-for-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux
Pull printk updates from Petr Mladek: "Improve the behavior during panic. The issues were found when testing the ongoing changes introducing atomic consoles and printk kthreads: - pr_flush() has to wait for the last reserved record instead of the last finalized one. Note that records are finalized in random order when generated by more CPUs in parallel. - Ignore non-finalized records during panic(). Messages printed on panic-CPU are always finalized. Messages printed by other CPUs might never be finalized when the CPUs get stopped. - Block new printk() calls on non-panic CPUs completely. Backtraces are printed before entering the panic mode. Later messages would just mess information printed by the panic CPU. - Do not take console_lock in console_flush_on_panic() at all. The original code did try_lock()/console_unlock(). The unlock part might cause a deadlock when panic() happened in a scheduler code. - Fix conversion of 64-bit sequence number for 32-bit atomic operations" * tag 'printk-for-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux: dump_stack: Do not get cpu_sync for panic CPU panic: Flush kernel log buffer at the end printk: Avoid non-panic CPUs writing to ringbuffer printk: Disable passing console lock owner completely during panic() printk: ringbuffer: Skip non-finalized records in panic printk: Wait for all reserved records with pr_flush() printk: ringbuffer: Cleanup reader terminology printk: Add this_cpu_in_panic() printk: For @suppress_panic_printk check for other CPU in panic printk: ringbuffer: Clarify special lpos values printk: ringbuffer: Do not skip non-finalized records with prb_next_seq() printk: Use prb_first_seq() as base for 32bit seq macros printk: Adjust mapping for 32bit seq macros printk: nbcon: Relocate 32bit seq macros
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