#armlinux on 2023-09-13 — irc logs at libera.irclog.whitequark.org

2021-05-27 16:22 ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux

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08:21 <javierm> geertu: any thoughts on my ssd130x patch that moves the HW buffer allocation to the CRTC's .atomic_check ?

08:22 <javierm> geertu: if you rebase your R1 support patches on top, you should be able to avoid any buffer allocations in the plane's .atomic_check when choosing the R1 format

08:25 <geertu> javierm: I applied v3 to my local tree (and did a half-ass rebase of R1 support), but didn't get to testing yet...

08:26 <javierm> geertu: nice

08:26 <javierm> I posted a v4 today but it was just to fix a build warning pointed out by the robot

08:26 <geertu> javierm: I noticed ;-) Just b4 am'ed...

08:28 <javierm> need to get used to build with W=1 before posting my patches :)

08:34 <milkylainen> on a side note. aarch64 gcc: https://rtx.meta.security/mitigation/2023/09/12/CVE-2023-4039.html

08:36 <milkylainen> surprised it could go under the radar all the way from gcc 7.

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09:14 <biju> I am seeing a kernel warning in today's next. not sure any one seen this issue?

09:15 <biju> [ 0.281686] registered taskstats version 1

09:15 <biju> [ 0.281813] ------------[ cut here ]------------

09:15 <biju> [ 0.281827] bpf_mem_cache[0]: unexpected object size 16, expect 96

09:15 <biju> [ 0.281862] WARNING: CPU: 0 PID: 1 at kernel/bpf/memalloc.c:500 bpf_mem_alloc_init+0x324/0x338

09:15 <biju> [ 0.281902] Modules linked in:

09:15 <biju> [ 0.281919] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.6.0-rc1-next-20230913-00003-g5734f56be91e-dirty #1044

09:15 <biju> [ 0.281941] Hardware name: Renesas SMARC EVK based on r9a07g044l2 (DT)

09:15 <biju> [ 0.281954] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)

09:15 <biju> [ 0.281970] pc : bpf_mem_alloc_init+0x324/0x338

09:15 <biju> [ 0.281985] lr : bpf_mem_alloc_init+0x324/0x338

09:15 <biju> [ 0.281999] sp : ffff80008286bd00

09:15 <biju> [ 0.282008] x29: ffff80008286bd00 x28: 0000000000000000 x27: ffff800082399a60

09:15 <biju> [ 0.282030] x26: ffff00007bde74b0 x25: 0000000000000000 x24: ffff80008239d8b8

09:15 <biju> [ 0.282051] x23: ffff800082399ca0 x22: 0000000000000000 x21: 0000000000000000

09:15 <biju> [ 0.282072] x20: 0000000000000000 x19: 0000000000000010 x18: 0000000000000030

09:15 <biju> [ 0.282093] x17: 0005000800000000 x16: 0004000800000001 x15: 07200765077a0769

09:15 <biju> [ 0.282114] x14: ffff8000823b0de0 x13: 000000000000028b x12: 00000000000000d9

09:15 <biju> [ 0.282135] x11: 0720072007200720 x10: ffff800082408de0 x9 : 00000000fffff000

09:15 <biju> [ 0.282156] x8 : ffff8000823b0de0 x7 : ffff800082408de0 x6 : 0000000000000000

09:15 <biju> [ 0.282176] x5 : 000000000000bff4 x4 : 0000000000000000 x3 : 0000000000000000

09:15 <biju> [ 0.282196] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00000ac90000

09:15 <biju> [ 0.282217] Call trace:

09:15 <biju> [ 0.282226] bpf_mem_alloc_init+0x324/0x338

09:15 <biju> [ 0.282241] bpf_global_ma_init+0x44/0x6c

09:15 <biju> [ 0.282256] do_one_initcall+0x6c/0x1b0

09:15 <biju> [ 0.282272] kernel_init_freeable+0x1c4/0x28c

09:15 <biju> [ 0.282286] kernel_init+0x24/0x1e0

09:15 <biju> [ 0.282304] ret_from_fork+0x10/0x20

09:15 <biju> [ 0.282317] ---[ end trace 0000000000000000 ]---

09:15 <biju> [ 0.282386] Loading compiled-in X.509 certificates

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09:39 <ukleinek> linusw__: the if (gpiolib_initialized) in gpiochip_add_data_with_key() is racy with gpiolib_dev_init(). Do you/we care?

09:45 <robmur01> biju: looks like that check was only added yesterday, so I guess it's finding something it was designed to find?

09:50 <robmur01> ...or maybe there's a bug in the check, since on closer inspection it seems like the call might possibly be using "i" uninitialised :/

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10:00 <biju> robmur01: OK thanks for the info.

10:08 <biju> https://lore.kernel.org/all/64f1f578-17e7-a8a8-12f2-6a1a0d98a4af@huaweicloud.com/

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10:34 <linusw__> ukleinek: I think at one point I convinced myself that a lock was overkill because they couldn't actually race in practice due to how the core_initcalls() are called, which is before preemption is up.

10:38 <linusw__> I guess the only gpio_chips added before gpiolib_dev_init() would be those hardwired in misc arch/* hacks that should be killed off by rewriting them into proper device drivers so we can just remove the variable.

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13:23 <geertu> javierm: your v3 seems to be working fine

13:26 <javierm> geertu: cool, thanks for testing

13:39 <javierm> geertu: if you can review the patch when you have some time or provide a tested-by, that would be great

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14:07 <bjdooks> hmm, has anyone wriitten a script/tool that can analyse warning reports and categorise/remove repeats?

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14:14 <ukleinek> linusw__: sounds plausible

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14:37 <geertu> bjdooks: linux-log-diff @ https://github.com/geertu/linux-scripts

14:37 <geertu> and linux-log-summary

14:38 <geertu> The former is what I use for my regressions/improvements reports

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14:54 <bjdooks> geertu: ta

14:55 <javierm> geertu: nice scripts!

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