commit 0b13bec787dccca96f8c431da732657ae01baf9a upstream.
The Hygon Dhyana CPU uses no delay in smp_quirk_init_udelay(), and does HLT on idle just like AMD does.
Signed-off-by: Pu Wen puwen@hygon.cn Signed-off-by: Borislav Petkov bp@suse.de Reviewed-by: Borislav Petkov bp@suse.de Cc: bp@alien8.de Cc: tglx@linutronix.de Cc: mingo@redhat.com Cc: hpa@zytor.com Cc: x86@kernel.org Cc: thomas.lendacky@amd.com Link: https://lkml.kernel.org/r/87000fa82e273f5967c908448414228faf61e077.153753336... --- arch/x86/kernel/smpboot.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 6489067b78a4..f51307d8ee7c 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -676,6 +676,7 @@ static void __init smp_quirk_init_udelay(void)
/* if modern processor, use no delay */ if (((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && (boot_cpu_data.x86 == 6)) || + ((boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) && (boot_cpu_data.x86 >= 0x18)) || ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) && (boot_cpu_data.x86 >= 0xF))) { init_udelay = 0; return; @@ -1592,7 +1593,8 @@ static inline void mwait_play_dead(void) void *mwait_ptr; int i;
- if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) + if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD || + boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) return; if (!this_cpu_has(X86_FEATURE_MWAIT)) return;