the -H5 patch adds a debugging check:
http://redhat.com/~mingo/O(1)-scheduler/sched-O1-2.5.2-pre11-H5.patch
it adds code to catch places that call schedule() from global-cli()
sections. Right now release_kernel_lock() doesnt automatically release the
IRQ lock if there is no kernel lock held. A fair amount of code does this
still, and i think we should fix them in 2.5.
(Such code, while of questionable quality, is safe if it also holds the
big kernel lock, but it's definitely SMP-unsafe it doesnt hold the bkl -
the BUG() assert only catches the later case.)
(Andi Kleen noticed this on the first day the patch was released, and
Andrew Morton reminded me today that i forgot to fix it ... :-| )
my systems do not trigger the BUG(), so there cannot be all that much
broken code left.
Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Tue Jan 15 2002 - 21:00:33 EST