[Xen-devel] [PATCH v2 04/17] x86/smpboot: smp init nodelay and no flush caches before sleep

[Pu Wen <puwen@xxxxxxxx>]

Dhyana use no delay in smp_quirk_init_udelay(), and return in
mwait_play_dead() as AMD does.

Signed-off-by: Pu Wen <puwen@xxxxxxxx>
---
 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 db9656e..26cb2c9 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -658,6 +658,7 @@ 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;
@@ -1574,7 +1575,8 @@ 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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