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| author | Thomas Gleixner <tglx@linutronix.de> | 2024-02-28 23:13:00 +0100 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-03-04 17:38:06 +0100 |
| commit | cb81deefb59de01325ab822f900c13941bfaf67f (patch) | |
| tree | 9f20489c94cdd3270937b41dd0f974952d1eb471 /arch/x86/Kconfig | |
| parent | 2be2a197ff6c3a659ab9285e1d88cbdc609ac6de (diff) | |
| download | lwn-cb81deefb59de01325ab822f900c13941bfaf67f.tar.gz lwn-cb81deefb59de01325ab822f900c13941bfaf67f.zip | |
x86/idle: Sanitize X86_BUG_AMD_E400 handling
amd_e400_idle(), the idle routine for AMD CPUs which are affected by
erratum 400 violates the RCU constraints by invoking tick_broadcast_enter()
and tick_broadcast_exit() after the core code has marked RCU non-idle. The
functions can end up in lockdep or tracing, which rightfully triggers a
RCU warning.
The core code provides now a static branch conditional invocation of the
broadcast functions.
Remove amd_e400_idle(), enforce default_idle() and enable the static branch
on affected CPUs to cure this.
[ bp: Fold in a fix for a IS_ENABLED() check fail missing a "CONFIG_"
prefix which tglx spotted. ]
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/877cim6sis.ffs@tglx
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 502986237cb6..080265369f8e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -147,6 +147,7 @@ config X86 select EDAC_ATOMIC_SCRUB select EDAC_SUPPORT select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) + select GENERIC_CLOCKEVENTS_BROADCAST_IDLE if GENERIC_CLOCKEVENTS_BROADCAST select GENERIC_CLOCKEVENTS_MIN_ADJUST select GENERIC_CMOS_UPDATE select GENERIC_CPU_AUTOPROBE |