Re: linux-next: build failure after merge of the net-next tree

Hi Stephen,

czw., 24 cze 2021 o 00:29 Stephen Rothwell [off-list ref] napisał(a):

Hi all,

Today's linux-next build (x86_64 modules_install) failed like this:

depmod: ../tools/depmod.c:1792: depmod_report_cycles_from_root: Assertion `is < stack_size' failed.

Caused by commit

62a6ef6a996f ("net: mdiobus: Introduce fwnode_mdbiobus_register()")

(I bisected to there and tested the commit before.)

The actual build is an x86_64 allmodconfig, followed by a
modules_install.  This happens in my cross build environment as well as
a native build.

$ gcc --version
gcc (Debian 10.2.1-6) 10.2.1 20210110
$ ld --version
GNU ld (GNU Binutils for Debian) 2.35.2
$ /sbin/depmod --version
kmod version 28
-ZSTD +XZ -ZLIB +LIBCRYPTO -EXPERIMENTAL

I have no idea why that commit should caused this failure.

Thank you for letting us know. Not sure if related, but I just found
out that this code won't compile for the !CONFIG_FWNODE_MDIO. Below
one-liner fixes it:

--- a/include/linux/fwnode_mdio.h
+++ b/include/linux/fwnode_mdio.h

@@ -40,7 +40,7 @@ static inline int fwnode_mdiobus_register(struct mii_bus *bus,
         * This way, we don't have to keep compat bits around in drivers.
         */

-       return mdiobus_register(mdio);
+       return mdiobus_register(bus);
 }
 #endif

I'm curious if this is the case. Tomorrow I'll resubmit with above, so
I'd appreciate recheck.

Thanks,
Marcin