linux-kernel - [BUG] What is "__ptrval__" in my dmesg logs? Bad "%p" expansion?

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Message-ID: <CAK2bqV+YhN7L=NYOMEkOvzRSa7-p51RnsRxR_=inNt+6OcsKvw@mail.gmail.com>
Date:   Sun, 3 Feb 2019 14:09:19 +0000
From:   Chris Rankin <rankincj@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: [BUG] What is "__ptrval__" in my dmesg logs? Bad "%p" expansion?

Hi.

I've suddenly realised that my kernel dmesg logs contain lines like:

[    0.000000] found SMP MP-table at [mem 0x000f5c20-0x000f5c2f]
mapped at [(____ptrval____)]
[    0.000000] Base memory trampoline at [(____ptrval____)] 98000 size 24576

and

[    0.000000] percpu: Embedded 41 pages/cpu @(____ptrval____) s129112
r8192 d30632 u262144

This seems to have started ~ Linux 4.15.x, and it does look like it
might be a macro expansion problem.

This is also happening for me on a different machine which uses the
radeon.ko driver (vs the amdgpu.ko driver):

drivers/gpu/drm/radeon/radeon_fence.c:862
     dev_info(rdev->dev, "fence driver on ring %d use gpu addr
0x%016llx and cpu addr 0x%p\n"

Does the kernel have a problem expanding "%p"?

Cheers,
Chris