linux-kernel - [linux-next][PPC][bisected c7d8b7][gcc 6.4.1] build error at drivers/gpu/drm/amd/amdgpu/amdgpu

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Message-ID: <1566452811.526.7.camel@abdul.in.ibm.com>
Date:   Thu, 22 Aug 2019 11:16:51 +0530
From:   Abdul Haleem <abdhalee@...ux.vnet.ibm.com>
To:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        linux-next <linux-next@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, jgg@...lanox.com.hch,
        rcampbell@...dia.com
Subject: [linux-next][PPC][bisected c7d8b7][gcc 6.4.1] build error at
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c:1471

Greeting's

Today's linux-next kernel 5.3.0-rc5-next-20190820 failed to build on my
powerpc machine

Build errors:
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c: In function amdgpu_exit:
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c:1471:2: error: implicit
declaration of function mmu_notifier_synchronize
[-Werror=implicit-function-declaration]
  mmu_notifier_synchronize();
  ^~~~~~~~~~~~~~~~~~~~~~~~ 
cc1: some warnings being treated as errors
make[4]: *** [drivers/gpu/drm/amd/amdgpu/amdgpu_drv.o] Error 1
make[3]: *** [drivers/gpu/drm/amd/amdgpu] Error 2

It was introduced with commit c7d8b7 (hmm: use mmu_notifier_get/put for
'struct hmm')

Reverting the commit fixes the issue.

-- 
Regard's

Abdul Haleem
IBM Linux Technology Centre