Kernel Space: Trenchboot, RAID10, Spelling Mistakes and Initcalls
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Trenchboot Secure Launch Support For Linux Sees New Patches
For a while now Oracle engineers and others have been working on Trenchboot as a means of secure launch/boot support when paired with the likes of Intel TXT and AMD SKINIT for trusted execution and configuring each piece of the software boot chain for trusted/secure handling. The latest kernel patches have been sent out for review for secure launching of the kernel.
Earlier this year Oracle engineers sent out Linux kernel patches for Trenchboot while on Thursday the newest work surfaced.
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Linux 5.10 To See RAID10 DISCARD Improvement - From 259 Seconds To Less Than 1 Second
Queued today into the block subsystem's "-next" area ahead of the Linux 5.10 cycle kicking off next month are some MD RAID enhancements.
In particular, thanks to Red Hat's Xiao Ni is improved RAID10 discard request handling. The change with a set of five SSDs in a RAID10 array on a test system dropped the mkfs.xfs time for creating an XFS file-system taking 4 minutes 39 seconds to less than 1 second... Quite a noticeable difference in that scenario.
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Colin King: Kernel janitor work: fixing spelling mistakes in kernel messages
The Linux 5.9-rc6 kernel source contains over 300,000 literal strings used in kernel messages of various sorts (errors, warnings, etc) and it is no surprise that typos and spelling mistakes slip into these messages from time to time.
To catch spelling mistakes I run a daily automated job that fetches the tip from linux-next and runs a fast spelling checker tool that finds all spelling mistakes and then diff's these against the results from the previous day. The diff is emailed to me and I put my kernel janitor hat on, fix these up and send these to the upstream developers and maintainers.
The spelling checker tool is a fast-and-dirty C parser that finds literal strings and also variable names and checks these against a US English dictionary containing over 100,000 words. As fun weekend side project I hand optimized the checker to be able to parse and spell check several millions lines of kernel C code per second.
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Initcalls, part 2: Digging into implementation
In the first part of this blog post series on Linux kernel initcalls, we looked at their purpose, their usage, and ways to debug them (using initcall_debug or FTrace). In this second part, we'll go deeper into the implementation of initcalls, with a look at the colorful __device_initcall() macro, the rootfs initcall, and how modules can be executed.
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