RE: [opensuse-kernel] Some kmp fail to build for Leap 15.2 ARM

-----Original Message----- From: Michal Kubecek Sent: 07 January 2020 12:17 To: opensuse-kernel@opensuse.org Cc: Guillaume Gardet Subject: Re: [opensuse-kernel] Some kmp fail to build for Leap 15.2 ARM

On Tue, Jan 07, 2020 at 10:10:33AM +0000, Guillaume Gardet wrote:

...

Hi,

Since mid-december, mali kmp fail to build on Leap 15.2 aarch64 with: ERROR: "mm_trace_rss_stat" [/home/abuild/rpmbuild/BUILD/driver/product/kernel/drivers/gpu/arm/midgar d/mali_kbase.ko] undefined!

JobHistory: https://build.opensuse.org/packages/mali-bifrost-kmp/job_history/devel :ARM:Factory:Contrib:Mali/openSUSE_Leap_15.2/aarch64

We probably need to add: EXPORT_SYMBOL_GPL(mm_trace_rss_stat); In mm/memory.c

But it is unclear why Tumbleweed (still at 5.3) and SLE15-SP2 are fine. Any idea what causes this difference?

The function was added by mainline commit b3d1411b6726 ("mm: emit tracepoint when RSS changes") in 5.5-rc1 so it's no surprise it's not in 5.3 TW kernel (and likely won't be even in 5.4 one).

This commit was backported to SLE15-SP2 in early December and we had some trouble with SLE15-SP2 snapshots recently so it's possible this backport didn't make it into the OBS mirror of SLE15-SP2 yet (or not into the repository you are building against) but the openSUSE-15.2 snapshot is a bit ahead.

Ok. Any idea why it needs this symbol, whereas my kmp does not require it? I guess other kmp may also be affected, so, I will send a patch for Leap 15.2 / SLE15-SP2 kernel, to export this symbol. Any objection? Guillaume

Michal Kubecek

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