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Mon, 22 Sep 2025 11:50:00 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Mon, 22 Sep 2025 17:49:21 +0200 From: "Arnd Bergmann" To: "Finn Thain" Cc: "Peter Zijlstra" , "Will Deacon" , "Andrew Morton" , "Boqun Feng" , "Jonathan Corbet" , "Mark Rutland" , linux-kernel@vger.kernel.org, Linux-Arch , "Geert Uytterhoeven" , linux-m68k@vger.kernel.org Message-Id: <61895919-76ef-485d-ad5c-0cff866566f3@app.fastmail.com> In-Reply-To: <0d93c6e5-a4cb-2f5c-e87d-e42a283324d6@linux-m68k.org> References: <20250915080054.GS3419281@noisy.programming.kicks-ass.net> <4b687706-a8f1-5f51-6e64-6eb09ae3eb5b@linux-m68k.org> <20250915100604.GZ3245006@noisy.programming.kicks-ass.net> <8247e3bd-13c2-e28c-87d8-5fd1bfed7104@linux-m68k.org> <57bca164-4e63-496d-9074-79fd89feb835@app.fastmail.com> <1c9095f5-df5c-2129-df11-877a03a205ab@linux-m68k.org> <534e8ff8-70cb-4b78-b0b4-f88645bd180a@app.fastmail.com> <0d93c6e5-a4cb-2f5c-e87d-e42a283324d6@linux-m68k.org> Subject: Re: [RFC v2 3/3] atomic: Add alignment check to instrumented atomic operations Content-Type: text/plain Content-Transfer-Encoding: 7bit On Wed, Sep 17, 2025, at 04:14, Finn Thain wrote: > On Tue, 16 Sep 2025, Arnd Bergmann wrote: >> On Tue, Sep 16, 2025, at 02:16, Finn Thain wrote: >> >> Right, especially since those structure definitions are more likely to >> be used on older drivers, there are probably some that do happen on >> m68k. On the other hand, any driver that is portable to non-m68k targets >> won't have this problem. >> > > Yes, but only inasmuchas drivers are completely portable. Any data > structure accessed or declared using #if conditional code would defeat > that kind of reasoning. Sure, but those are extremely rare. If there is a structure definition, it's usually done in a way that describes the hardware and is already densely packed. There are only a handful of compile-time checks for CONFIG_M68K and __m68k__ in the kernel, and none of those are around data structure definitions. >> I tried a trivial m68k defconfig build with "-Wpadded -malign-int" and >> found 3021 instances of structure padding, compared to 2271 without >> -malign-int. That is still something one could very reasonably go >> through with 'vim -q output', as almost all of them are obviously >> kernel-internal structures and not problematic. >> > > So, 3021 is the number of structs potentially needing to be checked? This > is not the kind of upper bound I consider feasible for careful manual > editing (it's worse than I thought). We need the compiler to help. It's the number of add pads, so there are some structures that show up many times in that list. There would be significantly more than those 3021 if you include drivers that are not in defconfig. An 'allmodconfig' build brings the number up to 17000, but it's easy to quickly bring that number down again by excluding stuff that is obviously specific to a random Arm SoC. I would also exclude all of fs/* and most of net/* as being clearly irrelevant here. In a given file, there are likely many instances either in the same struct or a set of related structs, where all can be discarded after looking at the pattern in that file. See the end of this email for a count by directory. I think just doing the uapi headers is probably enough to avoid accidentally introducing a new ABI when either the kernel or userspace gets built with -malign-int, everything inside of the kernel is at most a bug that can be fixed later. >> A quick manual scan only shows a number of uapi structures but very few >> drivers. There are a few hardware structures that are internally packed >> but in a structure that has gets an extra two bytes of harmless padding >> at the end (struct CUSTOM, struct amiga_hw_present, struct >> atari_hw_present, struct TT_DMA, struct pcc_regs). > > I wouldn't assume that padding at the end is inconsequential. I think the > analysis requires comparing object code. E.g. add the same padding > explicitly to see whether it alters object code under -mno-align-int. There is clearly a difference in uapi headers, especially when it gets passed through an ioctl that encodes the size of the structure in the command code. For the structures I listed above, I can see no way it would actually make a difference. >> The only ones I could find that actually seemed suspicious are: >> >> arch/m68k/include/asm/atarihw.h:426:10: warning: padding struct to align >> 'dst_address' [-Wpadded] arch/m68k/include/asm/openprom.h:76:13: >> warning: padding struct to align 'boot_dev_ctrl' [-Wpadded] >> drivers/net/ethernet/i825xx/82596.c:250:1: warning: padding struct size >> to alignment boundary >> >> I'm sure there are a few more, but probably not a lot more. See >> https://pastebin.com/Z2bjnD0G for the full list. I've also tried >> annotating the ones that show up in defconfig, see diffstat below. >> >> Unfortunately I found no way of annotating a struct a whole to use the >> traditional padding rules: "#pragma pack(push, 2)" lowers the alignment >> of all struct members to two bytes, including those with an explicit >> alignment like __aligned_u64. A struct-wide __attribute__((packed, >> aligned(2))) seems even worse, as it makes all members inside of the >> struck tightly packed and only aligns the struct itself. >> >> This means all misaligned members have to be individually marked as >> __packed, unless someone comes up with another type of annotation. >> > > Right. The trick will be to annotate the affected struct members by > automatic program transformation. I don't think automated transformation is going to work well here, as you may not want the same approach in each case, depending on what the code is: - it may be enough to annotate a single member as packed in order to make the entire structure compatible - some structures may have lots of misaligned members, but no holes, so a global __attribute__((packed, aligned(2))) on that struct is cleaner - if there are holes, some strategic additions of explicit padding can be cleaner than annotating each misaligned member. - automation won't be able to tell whether a structure is ABI relevant or not - similarly, many files are not going to be interesting for m68k. E.g. if drivers/infiniband has an ABI that is different for -malign-int, that can likely be ignored because nobody cares in practice. > It would be sufficient to have a plug-in to list the sites of all members > potentially needing annnotation. The list could be manually pared down and > the actual annotating could be scripted. Note that this list would be > shorter than a -Wpadded list, because there's a bunch of padding that's > not relevant. Yes, that should work to rule out many instances and to find out exactly where packing attributes are required. Arnd 2 arch/m68k/atari 5 arch/m68k/include/asm 39 block 1 block/fs 11 block/partitions 34 crypto 6 crypto/asymmetric_keys 10 drivers/accessibility/speakup 11 drivers/android 12 drivers/android/tests 15 drivers/ata 8 drivers/auxdisplay 11 drivers/base 5 drivers/base/firmware_loader 2 drivers/base/firmware_loader/builtin 10 drivers/base/regmap 2 drivers/base/test 2 drivers/bcma 18 drivers/block 2 drivers/block/aoe 7 drivers/block/drbd 4 drivers/block/null_blk 7 drivers/block/rnbd 2 drivers/block/zram 55 drivers/bluetooth 4 drivers/bus 2 drivers/bus/mhi/ep 4 drivers/bus/mhi/host 3 drivers/cdx 6 drivers/cdx/controller 3 drivers/char 8 drivers/char/hw_random 35 drivers/char/ipmi 11 drivers/char/tpm 1 drivers/char/tpm/eventlog 3 drivers/char/tpm/st33zp24 1 drivers/char/xillybus 48 drivers/clk 5 drivers/clk/actions 8 drivers/clk/bcm 8 drivers/clk/imx 6 drivers/clk/ingenic 11 drivers/clk/mediatek 24 drivers/clk/qcom 2 drivers/clk/ralink 21 drivers/clk/renesas 6 drivers/clk/samsung 1 drivers/clk/sifive 9 drivers/clk/socfpga 11 drivers/clk/sophgo 3 drivers/clk/sprd 2 drivers/clk/starfive 17 drivers/clk/sunxi-ng 1 drivers/clk/ti 1 drivers/clk/versatile 6 drivers/clk/visconti 2 drivers/clk/xilinx 43 drivers/clocksource 1 drivers/comedi 48 drivers/comedi/drivers 6 drivers/comedi/drivers/tests 9 drivers/counter 37 drivers/crypto 3 drivers/crypto/amlogic 4 drivers/crypto/aspeed 28 drivers/crypto/caam 17 drivers/crypto/ccree 3 drivers/crypto/hisilicon/sec 7 drivers/crypto/inside-secure 5 drivers/crypto/inside-secure/eip93 2 drivers/crypto/intel/ixp4xx 4 drivers/crypto/intel/keembay 3 drivers/crypto/marvell/cesa 7 drivers/crypto/qce 4 drivers/crypto/starfive 6 drivers/crypto/tegra 7 drivers/crypto/virtio 2 drivers/crypto/xilinx 4 drivers/dax 2 drivers/devfreq 1 drivers/devfreq/event 48 drivers/dma 3 drivers/dma-buf 1 drivers/dma-buf/heaps 7 drivers/dma/amd/qdma 4 drivers/dma/dw 3 drivers/dma/dw-axi-dmac 2 drivers/dma/lgm 3 drivers/dma/mediatek 5 drivers/dma/qcom 1 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