Hi, IA64 Gurus,
I was looking for the reasons of IA64's __ARCH_WANT_UNLOCKED_CTXSW,
and found the historical commit below:
commit f8efa27662532ad5adb2790bfc3f4c78e019cfad
Author: Chen, Kenneth W <kenneth.w.chen@xxxxxxxxx>
Date: Thu Jan 26 18:24:59 2006 -0800
[IA64] remove staled comments in asm/system.h
With the recent optimization made to wrap_mmu_context function,
we don't hold tasklist_lock anymore when wrapping context id.
The comments in asm/system.h must fall through the crack earlier.
Remove staled comments.
I believe it is still beneficial to unlock the runqueue lock
across context switch. So leave __ARCH_WANT_UNLOCKED_CTXSW on.
Signed-off-by: Ken Chen <kenneth.w.chen@xxxxxxxxx>
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
The comment confuses a reader. It may seem that the #define
is not necessary now, no comment around it at all.
So, could you please point the deadlock we want to avoid
by __ARCH_WANT_UNLOCKED_CTXSW? I've tried to find, but nothing
was found by me. No IA64 machines around, so I can't just
to load kernel w/o this define.
Thanks,
Kirill
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