Re: [PATCH] 2.4-ac: sparc64 support for O(1) scheduler

From: Thomas Duffy (
Date: Fri Jun 14 2002 - 17:00:03 EST

begin David S. Miller quotation on Thu, 13 Jun 2002 21:32:11 -0700:

> From: Robert Love <>
> Date: 13 Jun 2002 12:21:58 -0700
> Patch is against 2.4.19-pre10-ac2, please apply.
> Ummm what is with all of those switch_mm() hacks? Is this an attempt to
> work around the locking problems? Please don't do that as it is going
> to kill performance and having ifdef sparc64 sched.c changes is ugly to
> say the least.
> Ingo posted the correct fix to the locking problem with the patch he
> posted the other day, that is what should go into the -ac patches.

This part of the patch (the change to kernel/sched.c) can be safely
removed without making o1 stop working.

This hack (conservatively) fixes an issue where on bootup, the machine
would get into a page fault loop and hang. This only happens a very
small percentage of the time. I will investigate whether the patch
Ingo put out fixes this issue.


He who receives an idea from me, receives instruction himself without
lessening mine; as he who lights his taper at mine, receives light
without darkening me.                      -- Thomas Jefferson
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