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Hello,
On May 5, 2009, at 4:26 PM, Manuel Bouyer wrote:
Module Name: src
Committed By: bouyer
Date: Tue May 5 20:26:36 UTC 2009
Modified Files:
src/sys/kern: kern_softint.c
Log Message:
Declare sh_flags volatile.
Without it, on ports where splhigh() is inline, the compiler will
optimise
the second SOFTINT_PENDING test in softint_schedule(). A dissasembly
of softint_schedule() with and without the volatile sh_flags confirm
this
on sparc.
Because of this there is a race that could lead to the softhand_t
being enqueued twice on si_q, leading to a corrupted queue and
some handler being SOFTINT_PENDING but never called.
Should fix PR kern/38637
That sounds a lot like a problem I'm trying to track down on macppc
for a while now ( and yes, spl*() are inlined )
have fun
Michael
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