Toots for kernellogger@fosstodon.org account

Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-23 at 18:57

Highlights from the main ACPI (https://git.kernel.org/torvalds/c/603f162a02d5ccf0b3c5b2c6f488e456be81007f) and PM (https://git.kernel.org/torvalds/c/f4b9d3bf44d59ca4489bd8c489539c27c02e5c6a) merged for #Linux 6.14:

• Extend the Apple cpufreq driver to support more SoCs

• Set default EPP policy on Ryzen processors in amd-pstate

• reduce excessive delays due to timer inaccuracy, mostly affecting system suspend and resume

• Add Clearwater Forest processor support to the intel_idle cpuidle driver

• Use CPPC to get scaling factors […] in the intel_pstate driver

[#]Kernel #LinuxKernel

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-23 at 18:53

Highlights from the main HID (https://git.kernel.org/torvalds/c/27c02784773a69fd896e42f3cec73be8c5c83c1f) and input (https://git.kernel.org/torvalds/c/88e969fc18a25ab3ffe554a1c2e8e45c8ade6d3e) merges for #Linux 6.14:

• add mapping for F23 to atkbd driver for the MS "Copilot" key

• several new vendor/device ID pairs added to xpad game controller driver

• support for Intel Touch Host Controller

• PCI Wacom device support (depends on Intel THC support)

• SteelSeries Arctis 9 support

[#]kernel #LinuxKernel

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-23 at 09:05

Designing Custom #Linux Schedulers with sched_ext – slides and the recording of yesterdays #LinuxFoundation Mentorship session from @arighi are now online:

https://www.linuxfoundation.org/webinars/designing-custom-linux-schedulers-with-sched_ext

Direct link to the slides: https://events.linuxfoundation.org/wp-content/uploads/2025/01/Andrea-Righi-Mentorship-1_22_25-scx.pdf

Direct link to the recording: https://www.youtube.com/watch?v=jsLjg9tGuVI

[#]Kernel #LinuxKernel

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-23 at 06:50

3k followers? Cool! 🥳 Glad you are all here! Enjoy your time in the Fediverse!

Never expected it to get the number that high when I came here a bit more than two years ago – and a few months later stopped tweeting using my Twitter account that had 5k followers back then.

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-22 at 06:12

2/ Side note wondering if the the #Linux #Kernel boot logger is what we'll all be using sooner or later:

'"drm_log is a simple logger that uses the drm_client API to print the [#LinuxKernel's] kmsg boot log on the screen. This is not a full replacement to fbcon, as it will only print the kmsg. It will never handle user input, or a terminal because this is better done in userspace."'

https://git.kernel.org/torvalds/c/f7b42442c4ac142ab5e261858cec48eb6c9c1567

For more details and related patches, see this submission: https://lore.kernel.org/all/20241204160014.1171469-1-jfalempe@redhat.com/

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-22 at 04:57

A few highlights from the main #drm merge for #Linux 6.14:

https://git.kernel.org/torvalds/c/96c84703f1cf6ea43617f9565166681cd71df104

• a new cgroup controller 'DMEM' for device memory

• drm/log: a new boot logger to draw the kmsg on the screen

• new driver: amdxdna - Ryzen AI NPU support

• amdgpu:

• DRM panic support

• various improvements for RDNA4 / GFX12

• msm:

• added SM6150 (aka QCS615) support

• vc4:

• Add support for BCM2712

• panfrost:

• Add MT8188 Mali-G57 MC3 support

[#]LinuxKernel #Kernel #GPU

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-22 at 04:43

A few highlights from the main #Rust merge for #Linux 6.14:

https://git.kernel.org/torvalds/c/e3610441d1fb47b1f00e4c38bdf333176e824729

• Start to use 'derive(CoercePointee)' on Rust >= 1.84.0. This is a major milestone on the path to build the kernel using only stable Rust features. […]

• Finish the move to custom FFI integer types started in the previous cycle and finally map 'long' to 'isize' and 'char' to 'u8'.

• Introduce 'PROCMACROLDFLAGS' environment variable to allow […] which Android needs.

[#]LinuxKernel #Kernel #Rustlang

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-21 at 11:38

Side note: The screenshotted comment from https://lobste.rs/s/k6al6k/migrating_away_from_bcachefs#c_ygwogu yet again made me think:

I wonder how may people simply do not know how much XFS has changed in the past decade and that there are quite a few nice XFS features that recently made it into the #Linux #kernel or soon likely will make it – like online repair and a ton of other things, some of which still considered experimental.

But maybe it's also a good thing that this happens without giving XFS new names (like in the EXT[234]).

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-21 at 10:14

Migrating away from #bcachefs

https://blog.sesse.net/blog/tech/2025-01-20-21-45_migrating_away_from_bcachefs.html

Steinar H. Gunderson aka Sesse writes:

'"[…] I've converted my last bcachefs filesystem to XFS, and I don't intend to look at it again in the near future. […]

I no longer trust bcachefs' future. […]

[…] I've had catastrophic data loss bugs that went unfixed for weeks despite multiple people reporting them. I've seen strange read performance issues. I've had oopses. […] “oh, yeah, that's a known issue […]

There are more things: […]"'

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-21 at 08:58

A few bits from the main #bcachefs merge for #Linux 6.14:

https://git.kernel.org/torvalds/c/2622f290417001b0440f4a48dc6978f5f1e12a56

"'Lots of scalability work, another big on-disk format change. […]

Like 6.11, this is another big and xpensive automatic/required on disk format upgrade. This is planned to be the last big on disk format upgrade before the experimental label comes off. There will be one more minor on disk format update for a few things that couldn't make this release.'"

[#]kernel #LinuxKernel

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-21 at 08:56

A few highlights from the main #btrfs merge for #Linux 6.14:

https://git.kernel.org/torvalds/c/0eb4aaa230d725fa9b1cd758c0f17abca5597af6

• more read IO balancing strategies (experimental config), add two new ways how to select a device for read if […] round-robin, balance reads across devices relevant for the requested IO range

• add encoded write ioctl support to io_uring […]

• support FS_IOC_READ_VERITY_METADATA, applications can use the metadata to do their own verification

[#]kernel #LinuxKernel

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-20 at 06:34

[#]Linux 6.13 is out: https://lore.kernel.org/lkml/CAHk-=wiprabAQcCwb3qNhrT5P50MJNqunC9JU5v99kdvM-2rsg@mail.gmail.com/

Linus writes: '"So nothing horrible or unexpected happened last week, so I've tagged and pushed out the final 6.13 release. […]"

For a list of new features, see https://lwn.net/Articles/1005488/ and the LWN.net merge-window summaries https://lwn.net/Articles/998623/ and https://lwn.net/Articles/998990/ as well as https://kernelnewbies.org/Linux_6.13

[#]kernel #LinuxKernel

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-18 at 06:36

[#]GNU #coreutils 9.6 is out:

https://savannah.gnu.org/news/?id=10715

A few highlights:

• cksum -a now supports the "crc32b" option

• ls now supports the --sort=name option

• printf now supports indexed arguments

• test supports the POSIX:2024 specified '<' and '>' operators with strings

• cksum -a crc, makes use of AVX2, AVX512, and ARMv8 SIMD extensions

• wc now reads a minimum of 256KiB at a time […] was seen to increase wc -l performance by about 10% when reading cached files on modern systems.

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-18 at 06:28

Bypassing disk encryption on systems with automatic TPM2 unlock – https://oddlama.org/blog/bypassing-disk-encryption-with-tpm2-unlock/

oddlama writes: '"Most TPM2 unlock setups fail to verify the LUKS identity of the decrypted partition. Since the initrd must reside in an unencrypted boot partition, an attacker can inspect it to learn how it decrypts the disk and also what type of filesystem it expects to find inside. By recreating the LUKS partition with a known key, we can confuse the initrd […]"' #tpm #linux #Encryption

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-17 at 10:25

Fun fact: yes, even I[1] follow https://docs.kernel.org/admin-guide/verify-bugs-and-bisect-regressions.html when building a local #Linux #kernel for testing purposes[2], as it's so easy to forget a helpful step or two – like setting CONFIG_LOCALVERSION or enabling/disabling debuginfo symbols.

[1] I'm the main author of that text

[2] https://lore.kernel.org/all/20250117095522.GA2391@lst.de/ #LinuxKernel

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-15 at 06:31

Imagine being a mechanic for Mercedes and receiving an email from a customer who complains about leaky doors and strange engine noises – and only after four or five tedious mails back and forth you figure out the car was bought from modder who added gullwing doors, shortened the wheelbase, and added twin turbochargers.

I guess that's how #Linux developers feel when they find out the bug someone reported only happens with a heavily modified #kernel like those shipped in RHEL, SLES, or Ubuntu.

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-14 at 17:04

IPU6 camera support status update

https://hansdegoede.dreamwidth.org/29233.html

Hans de Goede writes: 'The initial IPU6 camera support landed in Fedora 41 only works on a limited set of laptops. […]

I have been working on making the camera work on more laptop models. After receiving and sending many emails and blog post comments about this I have started filing Fedora bugzilla issues […]

Currently the following issues are being either actively being worked on, or are being tracked to be fixed in the future. […]"

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-14 at 11:13

"[…] In this article we'll review some of the notable updates and enhancements to debuginfod over the past year as well as the scale at which public debuginfod servers are operating.[…]"

https://developers.redhat.com/articles/2025/01/14/debuginfod-project-update-2024# (from Aaron Merey)

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-13 at 06:32

2/ Also note this part of Linus' message:

'"For me a traditional holiday activity tends to be a LEGO build or two, […]

[…] this year I also ended up doing a number of guitar pedal kit builds […] because I enjoy the tinkering, […]

[…] since I want to have the excuse to continue to do them, and since I don't actually have any use for the resulting pedals […] , I decided that I'm going to see if some hapless kernel developer would want one. […]'"

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Written by Thorsten Leemhuis (acct. 1/4) on 2025-01-13 at 06:29

[#]Linux 6.13-rc7 is out, final expected next week:

https://lore.kernel.org/lkml/CAHk-=wjrP_uH7_2h7_P+qAO9o5wmQRnhpiivsq1dti4xsM-_9w@mail.gmail.com/

'"[…] we're definitely back to speed after the two quiet holiday weeks.

This rc7 is slightly bigger than normal, but considering the timing, it's pretty much where I would have expected, and nothing really stands out. […]

So unless something odd happens the upcoming week, I expect to release

a final 6.13 next week as per the normal schedule.

               Linus"'

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