linux-kernel - RE: [PATCH] scsi: megaraid_sas: use spin

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Date:   Thu, 22 Oct 2020 10:09:00 +0000
From:   Tianxianting <tian.xianting@....com>
To:     Finn Thain <fthain@...egraphics.com.au>
CC:     "kashyap.desai@...adcom.com" <kashyap.desai@...adcom.com>,
        "sumit.saxena@...adcom.com" <sumit.saxena@...adcom.com>,
        "shivasharan.srikanteshwara@...adcom.com" 
        <shivasharan.srikanteshwara@...adcom.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "megaraidlinux.pdl@...adcom.com" <megaraidlinux.pdl@...adcom.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] scsi: megaraid_sas: use spin_lock() in hard IRQ

Yes, thanks
I see, If we add this patch, we need to get all cpu arch that support nested interrupts.

-----Original Message-----
From: Finn Thain [mailto:fthain@...egraphics.com.au] 
Sent: Thursday, October 22, 2020 11:29 AM
To: tianxianting (RD) <tian.xianting@....com>
Cc: kashyap.desai@...adcom.com; sumit.saxena@...adcom.com; shivasharan.srikanteshwara@...adcom.com; jejb@...ux.ibm.com; martin.petersen@...cle.com; megaraidlinux.pdl@...adcom.com; linux-scsi@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: RE: [PATCH] scsi: megaraid_sas: use spin_lock() in hard IRQ

On Thu, 22 Oct 2020, Tianxianting wrote:

> Do you mean Megasas raid can be used in m68k arch?

m68k is one example of an architecture on which the unstated assumptions in your patch would be invalid. Does this help to clarify what I wrote?

If Megasas raid did work on m68k, I'm sure it could potentially benefit from the theoretical performance improvement from your patch.

So perhaps you would consider adding support for slower CPUs like m68k.