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    Subject[PATCH v8 04/16] x86/smpboot: SMP init no delay and not flush caches before sleep
    Date
    The Hygon Dhyana CPU uses no delay in smp_quirk_init_udelay(),
    and returns in mwait_play_dead() as AMD does.

    Signed-off-by: Pu Wen <puwen@hygon.cn>
    Reviewed-by: Borislav Petkov <bp@suse.de>
    ---
    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;
    --
    2.7.4
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