RE: [PATCH v2 08/16] x86/mce: Define BSP-only SMCA init

[Zhuo, Qiuxu]

> From: Yazen Ghannam <yazen.ghannam@xxxxxxx>
> Sent: Friday, February 14, 2025 12:46 AM
> To: x86@xxxxxxxxxx; Luck, Tony <tony.luck@xxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-edac@xxxxxxxxxxxxxxx;
> Smita.KoralahalliChannabasappa@xxxxxxx; Yazen Ghannam
> <yazen.ghannam@xxxxxxx>
> Subject: [PATCH v2 08/16] x86/mce: Define BSP-only SMCA init
> 
> Currently on AMD systems, MCA interrupt handler functions are set during
> CPU init. However, the functions only need to be set once for the whole
> system.
> 
> Assign the handlers only during BSP init. Do so only for SMCA systems to
> maintain the old behavior for legacy systems.

Looks like the interrupt handler is still set during each per-CPU online, right?
What's the benefit/purpose of this patch? Thanks!

    mce_cpu_online(cpu)
        mce_threshold_create_device(cpu) {
            ...
            mce_threshold_vector = amd_threshold_interrupt;
            ...
       }

> Signed-off-by: Yazen Ghannam <yazen.ghannam@xxxxxxx>

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