linux/arch
Yang Xiaowei 2496afbf1e xen: use stronger barrier after unlocking lock
We need to have a stronger barrier between releasing the lock and
checking for any waiting spinners.  A compiler barrier is not sufficient
because the CPU's ordering rules do not prevent the read xl->spinners
from happening before the unlock assignment, as they are different
memory locations.

We need to have an explicit barrier to enforce the write-read ordering
to different memory locations.

Because of it, I can't bring up > 4 HVM guests on one SMP machine.

[ Code and commit comments expanded -J ]

[ Impact: avoid deadlock when using Xen PV spinlocks ]

Signed-off-by: Yang Xiaowei <xiaowei.yang@intel.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2009-09-09 16:38:44 -07:00
..
alpha mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
arm [ARM] Kirkwood: enable eSATA on QNAP TS-219P 2009-08-24 11:56:00 -04:00
avr32 Merge git://git.kernel.org/pub/scm/linux/kernel/git/hskinnemoen/avr32-2.6 2009-08-24 12:26:48 -07:00
blackfin blackfin: fix wrong CTS inversion 2009-07-20 16:38:44 -07:00
cris mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
frv mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
h8300 sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
ia64 [IA64] fix csum_ipv6_magic() 2009-09-02 09:14:48 -07:00
m32r mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
m68k m68k,m68knommu: Wire up rt_tgsigqueueinfo and perf_counter_open 2009-08-26 23:14:50 +02:00
m68knommu m68k,m68knommu: Wire up rt_tgsigqueueinfo and perf_counter_open 2009-08-26 23:14:50 +02:00
microblaze microblaze: Update Microblaze defconfigs 2009-08-18 11:05:11 +02:00
mips Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus 2009-08-17 13:39:52 -07:00
mn10300 MN10300: includecheck fix: mn10300, pci.h 2009-08-10 08:54:27 -07:00
parisc parisc: fix warning in traps.c 2009-08-28 19:37:20 -10:00
powerpc powerpc: Fix i8259 interrupt driver kernel crash on ML510 2009-09-05 14:58:07 -07:00
s390 [S390] set preferred console based on conmode 2009-08-23 18:10:01 +02:00
sh sh: sh7724 ddr self-refresh changes 2009-08-15 12:58:50 +09:00
sparc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6 2009-09-05 13:49:06 -07:00
um mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
x86 xen: use stronger barrier after unlocking lock 2009-09-09 16:38:44 -07:00
xtensa mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
.gitignore
Kconfig gcov: add gcov profiling infrastructure 2009-06-18 13:03:57 -07:00