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author | David S. Miller <davem@davemloft.net> | 2008-04-03 14:33:42 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2008-04-03 14:33:42 -0700 |
commit | 3bb5da3837cc1aa17736b05139c9a22c3794851a (patch) | |
tree | c92d5684a866542b1cb20641607ac1643ce03a47 /arch/powerpc/kernel/process.c | |
parent | 7feb49c82a74bc7c091b8ab2a3f96baa33d08ece (diff) | |
parent | 9597362d354f8655ece324b01d0c640a0e99c077 (diff) | |
download | op-kernel-dev-3bb5da3837cc1aa17736b05139c9a22c3794851a.zip op-kernel-dev-3bb5da3837cc1aa17736b05139c9a22c3794851a.tar.gz |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
Diffstat (limited to 'arch/powerpc/kernel/process.c')
-rw-r--r-- | arch/powerpc/kernel/process.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 4846bf5..4ec6055 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -241,8 +241,12 @@ void discard_lazy_cpu_state(void) } #endif /* CONFIG_SMP */ +static DEFINE_PER_CPU(unsigned long, current_dabr); + int set_dabr(unsigned long dabr) { + __get_cpu_var(current_dabr) = dabr; + #ifdef CONFIG_PPC_MERGE /* XXX for now */ if (ppc_md.set_dabr) return ppc_md.set_dabr(dabr); @@ -259,8 +263,6 @@ int set_dabr(unsigned long dabr) DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); #endif -static DEFINE_PER_CPU(unsigned long, current_dabr); - struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *new) { @@ -325,10 +327,8 @@ struct task_struct *__switch_to(struct task_struct *prev, #endif /* CONFIG_SMP */ - if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) { + if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) set_dabr(new->thread.dabr); - __get_cpu_var(current_dabr) = new->thread.dabr; - } new_thread = &new->thread; old_thread = ¤t->thread; @@ -353,6 +353,12 @@ struct task_struct *__switch_to(struct task_struct *prev, account_process_vtime(current); calculate_steal_time(); + /* + * We can't take a PMU exception inside _switch() since there is a + * window where the kernel stack SLB and the kernel stack are out + * of sync. Hard disable here. + */ + hard_irq_disable(); last = _switch(old_thread, new_thread); local_irq_restore(flags); |