Re: [PATCH RFC] net: stmmac: Make DWMAC_ROCKCHIP and DWMAC_STM32 depend on PM_SLEEP

["Russell King (Oracle)" <linux@armlinux.org.uk>]

On Mon, Aug 18, 2025 at 12:11:09PM -0700, Paul E. McKenney wrote:
> Hello!
> 
> This might be more of a bug report than a patch, but here goes...
> 
> Running rcuscale or refscale performance tests on datacenter ARM systems
> gives the following build errors with CONFIG_HIBERNATION=n:
> 
> ERROR: modpost: "stmmac_simple_pm_ops" [drivers/net/ethernet/stmicro/stmmac/dwmac-rk.ko] undefined!
> ERROR: modpost: "stmmac_simple_pm_ops" [drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.ko] undefined!

The kernel build bot caught this, and I asked questions of Rafael last
week and have been waiting for a response that still hasn't come.

However, there was some discussion over the weekend (argh) on IRC from
rdd and arnd, but I didn't have time over a weekend (shocking, I know,
we're supposed to work 24x7 on the kernel, rather than preparing to
travel to a different location for medical stuff) to really participate
in that discussion.

Nevertheless, I do have a patch with my preferred solution - but whether
that solution is what other people prefer seems to be a subject of
disagreement according to that which happened on IRC. This affects every
driver that I converted to use stmmac_simple_pm_ops, which is more than
you're patching.

I've been missing around with medical stuff today, which means I also
haven't had time today to do anything further.

It's a known problem, but (1) there's been no participation from the
kernel community to help address it and (2) over the last few days I've
been busy myself doing stuff related to medical stuff.

Yea, it's shocking, but it's also real life outside of the realms of
kernel hacking.

-- 
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