Peter Zijlstra aa02cd2d9b xtime_lock vs update_process_times ... Commit d3d74453c3 ("hrtimer: fixup the HRTIMER_CB_IRQSAFE_NO_SOFTIRQ fallback") broke several archs, and since only Russell bothered to merge the fix, and Greg to ACK his arch, I'm sending this for merger. I have confirmation that the Alpha bit results in a booting kernel. That leaves: blackfin, frv, sh and sparc untested. The deadlock in question was found by Russell: IRQ handle -> timer_tick() - xtime seqlock held for write -> update_process_times() -> run_local_timers() -> hrtimer_run_queues() -> hrtimer_get_softirq_time() - tries to get a read lock Now, Thomas assures me the fix is trivial, only do_timer() needs to be done under the xtime_lock, and update_process_times() can savely be removed from under it. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Greg Ungerer <gerg@uclinux.org> CC: Richard Henderson <rth@twiddle.net> CC: Bryan Wu <bryan.wu@analog.com> CC: David Howells <dhowells@redhat.com> CC: Paul Mundt <lethal@linux-sh.org> CC: William Irwin <wli@holomorphy.com> Acked-by: Ingo Molnar <mingo@elte.hu> Acked-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2008-02-13 13:29:25 -08:00
..
boot	add a missing LIB_Y to arch/alpha/boot Makefile	2007-07-31 15:39:39 -07:00
kernel	xtime_lock vs update_process_times	2008-02-13 13:29:25 -08:00
lib	remove __attribute_used__	2008-01-28 23:21:18 +01:00
math-emu	alpha: fix conversion from denormal float to double	2008-01-17 15:38:59 -08:00
mm	Introduce flags for reserve_bootmem()	2008-02-07 08:42:25 -08:00
oprofile	spelling fixes: arch/alpha/	2007-10-20 01:04:37 +02:00
defconfig	alpha/parisc: remove config variable DEBUG_RWLOCK	2008-02-06 10:41:03 -08:00
Kconfig	ide: introduce HAVE_IDE	2008-02-09 10:46:40 +01:00
Kconfig.debug	alpha/parisc: remove config variable DEBUG_RWLOCK	2008-02-06 10:41:03 -08:00
Makefile	alpha: build fixes	2007-12-17 19:28:16 -08:00