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fbe1bf1e5f
This reverts commit45e34c8af5, and the two subsequent fixes to it:3f874c9b2a("x86/smp: Don't send INIT to non-present and non-booted CPUs")b1472a60a5("x86/smp: Don't send INIT to boot CPU") because it seems to result in hung machines at shutdown. Particularly some Dell machines, but Thomas says "The rest seems to be Lenovo and Sony with Alderlake/Raptorlake CPUs - at least that's what I could figure out from the various bug reports. I don't know which CPUs the DELL machines have, so I can't say it's a pattern. I agree with the revert for now" Ashok Raj chimes in: "There was a report (probably this same one), and it turns out it was a bug in the BIOS SMI handler. The client BIOS's were waiting for the lowest APICID to be the SMI rendevous master. If this is MeteorLake, the BSP wasn't the one with the lowest APIC and it triped here. The BIOS change is also being pushed to others for assimilation :) Server BIOS's had this correctly for a while now" and it does look likely to be some bad interaction between SMI and the non-BSP cores having put into INIT (and thus unresponsive until reset). Link: https://bbs.archlinux.org/viewtopic.php?pid=2124429 Link: https://www.reddit.com/r/openSUSE/comments/16qq99b/tumbleweed_shutdown_did_not_finish_completely/ Link: https://forum.artixlinux.org/index.php/topic,5997.0.html Link: https://bugzilla.redhat.com/show_bug.cgi?id=2241279 Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.