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Date:   Sat, 18 Jul 2020 10:17:14 -0700
From:   Guenter Roeck <linux@roeck-us.net>
To:     Christoph Hellwig <hch@lst.de>
Cc:     iommu@lists.linux-foundation.org,
        Alexey Kardashevskiy <aik@ozlabs.ru>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Robin Murphy <robin.murphy@arm.com>,
        linux-kernel@vger.kernel.org,
        Jesper Dangaard Brouer <brouer@redhat.com>,
        linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 3/5] dma-mapping: make support for dma ops optional
Message-ID: <20200718171714.GA237687@roeck-us.net>
References: <20200708152449.316476-1-hch@lst.de>
 <20200708152449.316476-4-hch@lst.de>
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On Wed, Jul 08, 2020 at 05:24:47PM +0200, Christoph Hellwig wrote:
> Avoid the overhead of the dma ops support for tiny builds that only
> use the direct mapping.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

For ppc:pmac32_defconfig and other configurations, this patch results in:

Error log:
drivers/macintosh/macio_asic.c: In function 'macio_add_one_device':
drivers/macintosh/macio_asic.c:393:16: error: 'struct device' has no member named 'dma_ops'
  393 |  dev->ofdev.dev.dma_ops = chip->lbus.pdev->dev.dma_ops;
      |                ^
drivers/macintosh/macio_asic.c:393:47: error: 'struct device' has no member named 'dma_ops'
  393 |  dev->ofdev.dev.dma_ops = chip->lbus.pdev->dev.dma_ops;
      |                                               ^

Bisect log attached.

Guenter

---
# bad: [aab7ee9f8ff0110bfcd594b33dc33748dc1baf46] Add linux-next specific files for 20200717
# good: [11ba468877bb23f28956a35e896356252d63c983] Linux 5.8-rc5
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# bad: [4d55a7a1298d197755c1a0f4512f56917e938a83] Merge remote-tracking branch 'crypto/master'
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git bisect bad 4406fe306759d700f2b2aa8adf890a7d7ef064ae
# bad: [27f18f0e00ed1f15ee55d479216c874561b6b70a] Merge remote-tracking branch 'arm-soc/for-next'
git bisect bad 27f18f0e00ed1f15ee55d479216c874561b6b70a
# good: [a23a793b03f465cf2222fa29e7f81d732a6f6fdf] Merge remote-tracking branch 'usb-chipidea-fixes/ci-for-usb-stable'
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git bisect good 05d94a2de41e8d9840d9749d553febdcf99cb0e5
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# good: [3c7f84b2248457030a903813e4af71d80141d663] Merge remote-tracking branch 'fpga-fixes/fixes'
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# bad: [88ff79e455afa3ac90739da27e24f655a965e3cf] Merge remote-tracking branch 'dma-mapping/for-next'
git bisect bad 88ff79e455afa3ac90739da27e24f655a965e3cf
# good: [7c4d50d4973b40c53ef6c592b41b0473127e6762] kbuild: do not export LDFLAGS_vmlinux
git bisect good 7c4d50d4973b40c53ef6c592b41b0473127e6762
# good: [c45db534668104ed5112ed371526db6096ac5742] Merge remote-tracking branch 'kbuild/for-next'
git bisect good c45db534668104ed5112ed371526db6096ac5742
# bad: [249542813648f7a278895ad25674d3e147f49ad6] dma-mapping: make support for dma ops optional
git bisect bad 249542813648f7a278895ad25674d3e147f49ad6
# good: [b4174173005972f8f6497883d08d87e0aba1b604] dma-mapping: inline the fast path dma-direct calls
git bisect good b4174173005972f8f6497883d08d87e0aba1b604
# first bad commit: [249542813648f7a278895ad25674d3e147f49ad6] dma-mapping: make support for dma ops optional