Re: [UPDATED PATCH 21/27] sparc32, smpboot: Use generic SMP booting infrastructure
From: Srivatsa S. Bhat <hidden>
Date: 2012-06-02 16:35:46
Also in:
lkml, sparclinux
On 06/02/2012 09:53 PM, Sam Ravnborg wrote:
quoted
As I mentioned in my other mail, I am thinking of changing them to arch_cpu_pre_starting(), arch_cpu_pre_online() and arch_cpu_post_online(). Let me know what you think of those names.Much better than "__" - so if none of the guys that excel in core code objects go for that.
Ok..
quoted
Would you kindly add a changelog and your sign-off to this patch?Will do in next revision.
Great!
... Thanks for the throughfull review. I will address all points - including passing the pointer down, as I assume you have some future plans with that pointer.quoted
I still didn't get how this solves the original problem of not having sparc_cpu_model set to sparc_leon. You mentioned that by the time we reach leon_smp_cpu_startup, that variable is not set. Even inside leon_smp_cpu_startup, I don't immediately see where it is set. Am I missing something?After looking more closely at the code it is my understanding that a leon CPU when started will actually jump to the reset vector and start from there. So the secondary CPU's will run long time after sparc_cpu_model is set so we can safely use it. The sun based cpu will in comparsion jump to an address supplied to a prom call - so they do not jump to the reset vector. But they also have sparc_cpu_model set so no problem there either.
Ok..
All this are my deductions from reading the code - but this is not an area I have looked at otherwise.. I may not find time today to cook up a new version of the patch - but then you will have it tomorrow.
Sure! Once again, thanks a lot for your time and efforts :-) Regards, Srivatsa S. Bhat