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    SubjectRe: [PATCH v5 04/16] x86/smpboot: smp init nodelay and no flush caches before sleep
    On Wed, Aug 29, 2018 at 08:43:41PM +0800, Pu Wen wrote:
    > Dhyana use no delay in smp_quirk_init_udelay(), and return in
    > mwait_play_dead() as AMD does.
    >
    > Signed-off-by: Pu Wen <puwen@hygon.cn>
    > ---
    > 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 f02ecaf..5369d7f 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;
    > --

    Reviewed-by: Borislav Petkov <bp@suse.de>

    --
    Regards/Gruss,
    Boris.

    Good mailing practices for 400: avoid top-posting and trim the reply.

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