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net: the DHCP lease goes to the log, not over the user's shell

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"net: eth0 10.0.2.15/255.255.255.0 via 10.0.2.2" arrived on the display seconds
after the prompt did, so the first thing anyone saw after booting was the kernel
typing into their session. It lands wherever the cursor happens to be -- in the
middle of a command, a fastfetch, or later a compositor's output.

console_takeover() hands the framebuffer to userspace on the first exec, and
after that the screen belongs to whoever is using the machine. cons_serial_only
already encodes that rule for the boot path -- "the display is the product; the
serial line is the diagnostics" -- and it starts set for exactly this reason.
What was missing is the rule for messages that cannot be timed to happen before
userspace starts, because they are waiting on a network.

klog() is that: the serial port only, whatever cons_serial_only currently says.
A macro rather than a function, because cprintf's varargs cannot be forwarded --
there is no vcprintf, and adding one to duplicate the formatter would cost more
than it buys. cprintf holds cons.lock for the whole message, so the flag cannot
be observed half-changed by another CPU printing at the same time.

Nothing is lost. The line still goes out the UART, which is where bootcheck
reads it from and where you want it when something is wrong, and a person who
wants to know their address reads /proc/netif.

Verified by screendumping the framebuffer after a boot and two fastfetch runs:
no interruption on screen, still one occurrence on serial.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VQ7Qx8E1q1M1bbCq8QLHS2
This commit is contained in:
Nexoniarz 2026-09-12 19:59:05 +02:00
commit d97dd9ed90
7 changed files with 42 additions and 76 deletions
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7
docs/architecture/networking.md
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@ -140,6 +140,13 @@ cannot run until the scheduler is entered.
DHCP obtains an address at boot. `/proc/netif` reports each interface's address,
netmask, gateway, MAC and frame counts, taken at the lwIP seam.
The lease announcement goes to the **serial line only**, through `klog()` rather
than `cprintf()`. A lease arrives seconds *after* the shell prompt does, so on
the display it lands in the middle of whatever the user is doing — which is the
same rule that makes `cons_serial_only` start set: the display is the product,
the serial line is the diagnostics. Someone who wants to know their address
reads `/proc/netif`.
> It is `/proc/netif` and not `/proc/net` deliberately: on Linux `/proc/net` is a
> directory of many files, and a single file by that name would be a lie about a
> well-known path.

21
docs/branding/Ascii/ascii_100.txt
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@ -1,15 +1,3 @@
rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrxJ
rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrYJJ
rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrYJJJJ
@ -46,12 +34,3 @@
bddddddddddddddddddddddddddddddddddddddddddddddddddddddkkkhh
bddddddddddddddddddddddddddddddddddddddddddddddddddddddkkh
dbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbk

30
docs/branding/Ascii/ascii_150.txt
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@ -1,20 +1,3 @@
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMLJ
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMLJII
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMJIIII
@ -67,16 +50,3 @@
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEED
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEED
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

10
docs/branding/Ascii/ascii_50.txt
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@ -1,9 +1,3 @@
rrrrrrrrrrrrrrrrrrrrrrrrrrJJ
rrrrrrrrrrrrrrrrrrrrrrrrrrJJJ
rrrrrrrrrrrrrrrrrrrrrrrrrrYJJ
@ -21,7 +15,3 @@
mmmmmmmmmmmmmmmmmmmmmmmmmmkkh
ddddddddddddddddddddddddddkk
bbbbbbbbbbbbbbbbbbbbbbbbbb

14
docs/branding/Ascii/ascii_68.txt
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@ -1,11 +1,3 @@
rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrnJ
rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrxJJJ
jrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrJJJJ
@ -29,9 +21,3 @@
wmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmkkkh
dddddddddddddddddddddddddddddddddddbkk
dddddddddddddddddddddddddddddddddddbh