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authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2009-02-18 20:18:57 +0100
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2009-03-30 08:36:01 +0200
commit224101ed69d3fbb486868e0f6e0f9fa37302efb4 (patch)
tree46830842a99659421eeabee65d299ab4c3b59f28 /arch/x86/kernel/paravirt.c
parentx86/paravirt: flush pending mmu updates on context switch (diff)
downloadlinux-224101ed69d3fbb486868e0f6e0f9fa37302efb4.tar.xz
linux-224101ed69d3fbb486868e0f6e0f9fa37302efb4.zip
x86/paravirt: finish change from lazy cpu to context switch start/end
Impact: fix lazy context switch API Pass the previous and next tasks into the context switch start end calls, so that the called functions can properly access the task state (esp in end_context_switch, in which the next task is not yet completely current). Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Diffstat (limited to 'arch/x86/kernel/paravirt.c')
-rw-r--r--arch/x86/kernel/paravirt.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 430a0e30577b..cf1437503bab 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -270,20 +270,20 @@ void paravirt_leave_lazy_mmu(void)
leave_lazy(PARAVIRT_LAZY_MMU);
}
-void paravirt_enter_lazy_cpu(void)
+void paravirt_start_context_switch(struct task_struct *prev)
{
if (percpu_read(paravirt_lazy_mode) == PARAVIRT_LAZY_MMU) {
arch_leave_lazy_mmu_mode();
- set_thread_flag(TIF_LAZY_MMU_UPDATES);
+ set_ti_thread_flag(task_thread_info(prev), TIF_LAZY_MMU_UPDATES);
}
enter_lazy(PARAVIRT_LAZY_CPU);
}
-void paravirt_leave_lazy_cpu(void)
+void paravirt_end_context_switch(struct task_struct *next)
{
leave_lazy(PARAVIRT_LAZY_CPU);
- if (test_and_clear_thread_flag(TIF_LAZY_MMU_UPDATES))
+ if (test_and_clear_ti_thread_flag(task_thread_info(next), TIF_LAZY_MMU_UPDATES))
arch_enter_lazy_mmu_mode();
}
@@ -399,10 +399,8 @@ struct pv_cpu_ops pv_cpu_ops = {
.set_iopl_mask = native_set_iopl_mask,
.io_delay = native_io_delay,
- .lazy_mode = {
- .enter = paravirt_nop,
- .leave = paravirt_nop,
- },
+ .start_context_switch = paravirt_nop,
+ .end_context_switch = paravirt_nop,
};
struct pv_apic_ops pv_apic_ops = {