linux-kernel - Re: Linux 5.19-rc4

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Date:   Sun, 26 Jun 2022 20:37:38 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 5.19-rc4

On Sun, Jun 26, 2022 at 02:50:03PM -0700, Linus Torvalds wrote:
[ ... ]
> 
> Please do go test. Thanks,

Build results:
	total: 149 pass: 148 fail: 1
Failed builds:
	powerpc:allmodconfig
Qemu test results:
	total: 489 pass: 489 fail: 0

Build failure is

Error log:
powerpc64-linux-ld: drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o uses hard float, drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_resource.o uses soft float
powerpc64-linux-ld: failed to merge target specific data of file drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_resource.o
powerpc64-linux-ld: drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o uses hard float, drivers/gpu/drm/amd/amdgpu/../display/dc/dcn315/dcn315_resource.o uses soft float
powerpc64-linux-ld: failed to merge target specific data of file drivers/gpu/drm/amd/amdgpu/../display/dc/dcn315/dcn315_resource.o
powerpc64-linux-ld: drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o uses hard float, drivers/gpu/drm/amd/amdgpu/../display/dc/dcn316/dcn316_resource.o uses soft float
powerpc64-linux-ld: failed to merge target specific data of file drivers/gpu/drm/amd/amdgpu/../display/dc/dcn316/dcn316_resource.o

A suggested fix is at
https://lore.kernel.org/lkml/20220618232737.2036722-1-linux@roeck-us.net/
but drm maintainers don't seem to be happy with it. I am not aware of an
alternate patch.

I still see the following runtime warning.

WARNING: CPU: 0 PID: 1 at lib/refcount.c:28 of_platform_bus_create+0x33c/0x3dc
refcount_t: underflow; use-after-free.

for which a fix is available in -next (ARM: 9207/1: amba: fix refcount
underflow if amba_device_add() fails).

Also, there is

WARNING: CPU: 0 PID: 1 at kernel/smp.c:905 smp_call_function_many_cond+0x280/0x544

which is seen on some arm platforms if KFENCE is enabled. This is not a
new problem. I'll probably disable KFENCE on affected platforms to reduce
the noise.

Guenter