On Thu 2025-10-16 11:47:53, Marcos Paulo de Souza wrote:
> In v6 the patches were rebased on top of v6.18-rc1, added Reviewed-by tags
> from
> John and did some small changes suggested by him as well.
>
> As usual, how I tested the changes:
>
> Testing
> -------
>
> I did the tests using qemu and reapplying commit f79b163c4231
> ('Revert "serial: 8250: Switch to nbcon console"') created originally by
> John, just to exercise the common 8250 serial from qemu. The commit can
> be checked on [1]. I had to solve some conflicts since the code has been
> reworked after the commit was reverted.
>
> Then I would create three different serial entries on qemu:
> -serial mon:stdio -serial pty -serial pty
>
> And for the kernel command line I added:
> earlyprintk=serial,ttyS2 console=ttyS2 console=ttyS1 console=ttyS1
> kgdboc=ttyS1,115200
>
> Without the last patch on this patchset, when KDB is triggered, the mirroring
> only worked on the earlyprintk console, since it's using the legacy console.
>
> With the last patch applied, KDB mirroring works on legacy and nbcon
> console. For debugging I added some messages to be printed by KDB, showing
> also the console->name and console->index, and I was able to see both
> ->write and ->write_atomic being called, and it all working together.
>
> [1]:
> https://github.com/marcosps/linux/commit/618bd49f8533db85d9c322f9ad1cb0da22aca9ee
> [2]:
> https://lore.kernel.org/lkml/[email protected]/
>
> Signed-off-by: Marcos Paulo de Souza <[email protected]>
> ---
> Changes in v6:
> - Rebased on top opf v6.18-rc1
> - Changed some includes, as suggedted by John
> - Reworked comments as suggested by John
> Marcos Paulo de Souza (5):
> printk: nbcon: Export console_is_usable
> printk: nbcon: Introduce KDB helpers
> printk: nbcon: Allow KDB to acquire the NBCON context
> printk: nbcon: Export nbcon_write_context_set_buf
> kdb: Adapt kdb_msg_write to work with NBCON consoles
>
> include/linux/console.h | 55 ++++++++++++++++++++++++++++++++++++
> include/linux/kdb.h | 16 +++++++++++
> kernel/debug/kdb/kdb_io.c | 47 +++++++++++++++++++++----------
> kernel/printk/internal.h | 45 ------------------------------
> kernel/printk/nbcon.c | 71
> +++++++++++++++++++++++++++++++++++++++++++++--
> 5 files changed, 171 insertions(+), 63 deletions(-)
JFYI, the patchset has been committed into printk/linux.git,
branch rework/nbcon-in-kdb.
Note: As promised, I have fixed the two compilation problems reported
by the robots when committing.
Best Regards,
Petr
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