Hey again,

On Tue, Jun 07, 2022 at 10:15:27AM +0100, Phil Elwell wrote:

On 07/06/2022 09:43, Jason A. Donenfeld wrote:

quoted

Hi Phil,

On Tue, Jun 7, 2022 at 10:29 AM Phil Elwell [off-list ref] wrote:

quoted

This patch is fatal for me in the downstream Raspberry Pi kernel - it locks up
on boot even before the earlycon output is available. Hacking jump_label_init to
skip the jump_entry for "crng_is_ready" allows it to boot, but is likely to have
consequences further down the line.

Also, reading this a few times, I'm not 100% sure I understand what
you did to hack around this and why that works. Think you could paste
your hackpatch just out of interest to the discussion (but obviously
not to be applied)?

This is the minimal version of my workaround patch that at least allows the 
board to boot. Bear in mind that it was written with no previous knowledge of 
jump labels and was arrived at by iteratively bisecting the list of jump_labels 
until the first dangerous one was found, then later working out that there was 
only one.

Looks like this patch fails due to CONFIG_STRICT_KERNEL_RWX.
Investigating deeper now, but that for starters seems to be the
differentiating factor between my prior test rig and one that reproduces
the error. I assume your raspi also sets CONFIG_STRICT_KERNEL_RWX.

Jason

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