diff options
| author | Li Zhong <zhong@linux.vnet.ibm.com> | 2012-10-17 23:30:13 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-01-10 04:43:45 +0100 |
| commit | fb9125680d0e7c23eae7c6000acc91ea26acab9c (patch) | |
| tree | 4f961ee02e1661876e6c2e565c8085558a0e9281 /arch/powerpc/platforms/pseries/hotplug-cpu.c | |
| parent | powerpc: Add a powerpc implementation of SHA-1 (diff) | |
| download | linux-fb9125680d0e7c23eae7c6000acc91ea26acab9c.tar.xz linux-fb9125680d0e7c23eae7c6000acc91ea26acab9c.zip | |
powerpc: Fix a lazy irq related WARING in arch_local_irq_restore()
The pseries CPU hotplug code uses cede_processor without properly
synchronizing the SW and HW interrupt enable state. This fixes
it using the same helpers that were written for the idle code.
Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
=======================
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/hotplug-cpu.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/hotplug-cpu.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c index a38956269fbf..217ca5c75b20 100644 --- a/arch/powerpc/platforms/pseries/hotplug-cpu.c +++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c @@ -127,9 +127,16 @@ static void pseries_mach_cpu_die(void) get_lppaca()->donate_dedicated_cpu = 1; while (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) { + while (!prep_irq_for_idle()) { + local_irq_enable(); + local_irq_disable(); + } + extended_cede_processor(cede_latency_hint); } + local_irq_disable(); + if (!get_lppaca()->shared_proc) get_lppaca()->donate_dedicated_cpu = 0; get_lppaca()->idle = 0; @@ -137,6 +144,7 @@ static void pseries_mach_cpu_die(void) if (get_preferred_offline_state(cpu) == CPU_STATE_ONLINE) { unregister_slb_shadow(hwcpu); + hard_irq_disable(); /* * Call to start_secondary_resume() will not return. * Kernel stack will be reset and start_secondary() |