https://github.com/torvalds/linux
Revision 34bf6bae3286a58762711cfbce2cf74ecd42e1b5 authored by Thomas Gleixner on 28 May 2024, 20:21:31 UTC, committed by Borislav Petkov (AMD) on 30 May 2024, 13:58:55 UTC
The new AMD/HYGON topology parser evaluates the SMT information in CPUID leaf
0x8000001e unconditionally while the original code restricted it to CPUs with
family 0x17 and greater.
This breaks family 0x15 CPUs which advertise that leaf and have a non-zero
value in the SMT section. The machine boots, but the scheduler complains loudly
about the mismatch of the core IDs:
WARNING: CPU: 1 PID: 0 at kernel/sched/core.c:6482 sched_cpu_starting+0x183/0x250
WARNING: CPU: 0 PID: 1 at kernel/sched/topology.c:2408 build_sched_domains+0x76b/0x12b0
Add the condition back to cure it.
[ bp: Make it actually build because grandpa is not concerned with
trivial stuff. :-P ]
Fixes: f7fb3b2dd92c ("x86/cpu: Provide an AMD/HYGON specific topology parser")
Closes: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/56
Reported-by: Tim Teichmann <teichmanntim@outlook.de>
Reported-by: Christian Heusel <christian@heusel.eu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Tim Teichmann <teichmanntim@outlook.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/7skhx6mwe4hxiul64v6azhlxnokheorksqsdbp7qw6g2jduf6c@7b5pvomauugk
1 parent 1613e60
Tip revision: 34bf6bae3286a58762711cfbce2cf74ecd42e1b5 authored by Thomas Gleixner on 28 May 2024, 20:21:31 UTC
x86/topology/amd: Evaluate SMT in CPUID leaf 0x8000001e only on family 0x17 and greater
x86/topology/amd: Evaluate SMT in CPUID leaf 0x8000001e only on family 0x17 and greater
Tip revision: 34bf6ba
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| .clang-format | -rw-r--r-- | 21.7 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .editorconfig | -rw-r--r-- | 672 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 194 bytes |
| .gitattributes | -rw-r--r-- | 105 bytes |
| .gitignore | -rw-r--r-- | 2.0 KB |
| .mailmap | -rw-r--r-- | 39.6 KB |
| .rustfmt.toml | -rw-r--r-- | 369 bytes |
| COPYING | -rw-r--r-- | 496 bytes |
| CREDITS | -rw-r--r-- | 101.9 KB |
| Kbuild | -rw-r--r-- | 2.5 KB |
| Kconfig | -rw-r--r-- | 555 bytes |
| MAINTAINERS | -rw-r--r-- | 741.7 KB |
| Makefile | -rw-r--r-- | 66.5 KB |
| README | -rw-r--r-- | 726 bytes |
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