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Sender: Guenter Roeck <groeck7@gmail.com>
Subject: Re: [PATCH v4 1/1] of: unittest: overlay: ensure proper alignment of
 copied FDT
To:     Frank Rowand <frowand.list@gmail.com>,
        Rob Herring <robh+dt@kernel.org>
Cc:     Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
        devicetree@vger.kernel.org,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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From:   Guenter Roeck <linux@roeck-us.net>
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Message-ID: <b081277a-763e-fdd4-43e3-483869a7e5c5@roeck-us.net>
Date:   Thu, 8 Apr 2021 19:20:21 -0700
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Precedence: bulk

On 4/8/21 3:53 PM, Frank Rowand wrote:
> On 4/8/21 4:54 PM, Guenter Roeck wrote:
>> On 4/8/21 2:28 PM, Rob Herring wrote:
>>>
>>> Applying now so this gets into linux-next this week.
>>>
>> The patch doesn't apply on top of today's -next; it conflicts
>> with "of: properly check for error returned by fdt_get_name()".
>>
>> I reverted that patch and applied this one, and the DT unittests
>> run with it on openrisc. I do get a single test failure, but I that
>> is a different problem (possibly with the test case itself).
>>
>> ### dt-test ### FAIL of_unittest_dma_ranges_one():923 of_dma_get_range: wrong DMA addr 0x00000000
>> 	(expecting 100000000) on node /testcase-data/address-tests/bus@80000000/device@1000
> 
> That is a known regression on the target that I use for testing (and
> has been since 5.10-rc1) - the 8074 dragonboard, arm 32.  No
> one else has reported it on the list, so even though I want to debug
> and fix it "promptly", other tasks have had higher priority.  In my
> notes I list two suspect commits:
> 
>   e0d072782c73 dma-mapping: introduce DMA range map, supplanting dma_pfn_offset
>   0a0f0d8be76d dma-mapping: split <linux/dma-mapping.h>
> 
> I think that was purely based on looking at the list of commits that
> may have touched OF dma.  I have not done a bisect.
> 

Here you are:

# bad: [2c85ebc57b3e1817b6ce1a6b703928e113a90442] Linux 5.10
# good: [bbf5c979011a099af5dc76498918ed7df445635b] Linux 5.9
git bisect start 'v5.10' 'v5.9'
# bad: [4d0e9df5e43dba52d38b251e3b909df8fa1110be] lib, uaccess: add failure injection to usercopy functions
git bisect bad 4d0e9df5e43dba52d38b251e3b909df8fa1110be
# good: [f888bdf9823c85fe945c4eb3ba353f749dec3856] Merge tag 'devicetree-for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
git bisect good f888bdf9823c85fe945c4eb3ba353f749dec3856
# good: [640eee067d9aae0bb98d8706001976ff1affaf00] Merge tag 'drm-misc-next-fixes-2020-10-13' of git://anongit.freedesktop.org/drm/drm-misc into drm-next
git bisect good 640eee067d9aae0bb98d8706001976ff1affaf00
# good: [c6dbef7307629cce855aa6b482b60cbf7777ed88] Merge tag 'usb-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
git bisect good c6dbef7307629cce855aa6b482b60cbf7777ed88
# good: [ce1558c285f9ad04c03b46833a028230771cc0a7] ALSA: hda/hdmi: fix incorrect locking in hdmi_pcm_close
git bisect good ce1558c285f9ad04c03b46833a028230771cc0a7
# good: [c48b75b7271db23c1b2d1204d6e8496d91f27711] Merge tag 'sound-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
git bisect good c48b75b7271db23c1b2d1204d6e8496d91f27711
# bad: [0cd7d9795fa82226e7516d38b474bddae8b1ff26] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching
git bisect bad 0cd7d9795fa82226e7516d38b474bddae8b1ff26
# good: [b1839e7c2a42ccd9a0587c0092e880c7a213ee2a] dmaengine: xilinx: dpdma: convert tasklets to use new tasklet_setup() API
git bisect good b1839e7c2a42ccd9a0587c0092e880c7a213ee2a
# bad: [0de327969b61a245e3a47b60009eae73fe513cef] cma: decrease CMA_ALIGNMENT lower limit to 2
git bisect bad 0de327969b61a245e3a47b60009eae73fe513cef
# good: [6eb0233ec2d0df288fe8515d5b0b2b15562e05bb] usb: don't inherity DMA properties for USB devices
git bisect good 6eb0233ec2d0df288fe8515d5b0b2b15562e05bb
# bad: [48d15814dd0fc429e3205b87f1af6cc472018478] lib82596: move DMA allocation into the callers of i82596_probe
git bisect bad 48d15814dd0fc429e3205b87f1af6cc472018478
# bad: [eba304c6861613a649ba46cfab835b1eddeacd8e] dma-mapping: better document dma_addr_t and DMA_MAPPING_ERROR
git bisect bad eba304c6861613a649ba46cfab835b1eddeacd8e
# bad: [b9bb694b9f62f4b31652223ed3ca38cf98bbb370] iommu/io-pgtable-arm: Clean up faulty sanity check
git bisect bad b9bb694b9f62f4b31652223ed3ca38cf98bbb370
# bad: [a97740f81874c8063c12c24f34d25f10c4f5e9aa] dma-debug: convert comma to semicolon
git bisect bad a97740f81874c8063c12c24f34d25f10c4f5e9aa
# bad: [e0d072782c734d27f5af062c62266f2598f68542] dma-mapping: introduce DMA range map, supplanting dma_pfn_offset
git bisect bad e0d072782c734d27f5af062c62266f2598f68542
# first bad commit: [e0d072782c734d27f5af062c62266f2598f68542] dma-mapping: introduce DMA range map, supplanting dma_pfn_offset

Guenter